NEW G1 FAQ

[NuclearSymphony]

First Generation Honda/Acura Legend
1986-1990

*WORK IN PROGRESS*

Production Versions
KA1: JDM sedan (RHD), 1986-1988
KA2: JDM sedan (RHD), 1986-1987
KA2: EDM sedan (RHD/LHD UK), 1986-1987
KA2: USDM sedan (LHD), 1986-1987
KA3: JDM coupe (RHD), 1987-1990
KA3: EDM coupe (RHD/LHD UK), 1987-1990
KA3: USDM coupe (LHD), 1987-1990
KA4: JDM sedan (RHD), 1988-1989
KA4: EDM sedan (RHD/LHD UK), 1988-1990
KA4: USDM sedan (LHD), 1988-1990
KA5: JDM sedan (RHD), 1989-1990
KA6: JDM sedan (RHD), 1989-1990

Production/Design Notes
Although the JDM Honda Legend used the same general one-piece headlight design for all sedan models 1986-1990, the USDM KA2 sedan featured a split headlight/foglight design (and different grille) for 1986-1988, switching over to the one-piece headlights in 1989. In addition, while the USDM sedan interior was redesigned for 1988, all other market Legends kept the original interior, which can be clearly seen in the door panels and dashboard. The coupe design similarly was offered in North America with a redesigned interior while retaining the older style for all other markets.

History
What makes the Legend unique?
The Legend was one of two models that launched under the Acura brand in the US (the other being the Integra) on March 27, 1986. It was the first Honda passenger vehicle to use a V6 engine, itself an all-aluminum 24-valve with a variable-length intake manifold developed from Honda’s F1 experience. The coupe was the first automobile to be engineered using CAD (computer aided design).

When was the Legend introduced?
The Honda Legend was introduced in November 1985 (in Japan) as a 1986 sedan model. Production at the plant in Saitama, Japan ended September 1990 as the new (second generation) model was introduced.

Where was the Legend sold or imported?
The Legend was sold as a Honda Legend in Japan, Mexico, Europe, Australia, and parts of China, and as an Acura Legend in the USA and Canada. Additionally, it was imported into Russia, New Zealand, and several other countries.

Production Data
Honda Legend (Japan):
1986-1988 V6 Gi/Mi/Zi (KA1*) - C20A
1986-1987 V6 Xi 2500 (KA2) - C25A
1987-1990 2Dr Hardtop (KA3) - C27A
1988-1990 V6 Xi (KA4**) - C27A
1989-1990 V6 Gi/Mi/Zi (KA5) - C20A
1989-1990 V6 Ti (KA5) - C20AT

*In 1989 the KA1 platform was redesigned and renamed KA5.
**In 1989 the KA4 platform was redesigned and renamed KA6.

Honda Legend (Europe/ROW):
1986-1988 V6 2.5 (KA2) - C25A
1987-1990 Coupe 2.7 (KA3) - C27A
1988-1990 V6 2.7 (KA4) - C27A

Honda Japan MSRPs (in USD):
1986 V6 Xi 2500 - $26,800
1989 V6 Mi - $17,900
1989 V6 Ti - $21,700
1989 V6 Gi Exclusive - $21,900
1989 V6 Xi Exclusive - $25,100
1989 V6 Ti Exclusive - $25,100

Acura Legend:
1986-1987 Sedan (KA2) - C25A
1987-1990 Coupe (KA3) - C27A*V6
1988-1990 Sedan (KA4) - C27A

Sales Recorded:
1986 - 25,082
1987 - 54,713
1988 - 70,770
1989 - 54,630
1990 - 53,656

Vehicle Identification (VIN)
The following is a breakdown of what your 17-digit Acura Legend Vehicle Idenfication Number (VIN) denotes:

Digit 1-3 - Manufacturer
JH4 = Honda Motor Co. LTD

Digit 4-6 - Body Type (chassis code)
KA1-9, KB1/2

Digit 7 - Body Style/Transmission Type
1 = coupe, manual
2 = coupe, automatic
5 = sedan, manual
6 = sedan, automatic

Digit 8 - Option/Trim Package
3 = 86-90 Base (No Sunroof)
4 = 86-90 Base (Sunroof)
5 = 86-90 Leather Interior
6 = 87-95 L Trim
7 = 87-95 LS Trim

Digit 9 - Check digit
0-9,X

Digit 10 - Production Year
G = 1986
H = 1987
J = 1988
K = 1989
L = 1990

Digit 11 - Assembly Plant Location
C = Saitama, Japan

Digit 12-17 - Individual vehicle serial number (in sequence)

What changed during the production of USDM Legends?
The Legend was launched in 1986 as a sedan with the C25A1 engine, cloth seats, and choice of manual or automatic transmission.

The paint codes offered were:
- Blade Silver Metallic (NH-95M)
- Florence Blue Metallic (B-37M)
- Ascot Gray (YR-74M)
- Olympia White (NH-509)

The interior cloth options were:
- Gray Moquette
- Blue Moquette
- Sand Gray Moquette

In February 1987, the coupe was added with the C27A1 engine, single-color dash, and these trim levels:
- Base model could be ordered with moquette upholstery.
- L trim level added, including heated side mirrors, 4-way power driver's seat, automatic climate control, dual illuminated vanity mirrors, ALB, auto seatbelt presenters, info center, security system, leather seats and leather-wrapped steering wheel.
- LS trim level added, including Bose sound system and driver SRS airbag.

The following changes were also introduced to the sedan:
- Base model could be ordered with no sunroof.
- L trim level added, including heated side mirrors, 4-way power driver's seat, dual illuminated vanity mirrors, leather seats and leather-wrapped steering wheel.
- LS trim level added, including Bose sound system.

Sedans received the following new paint options:


Coupes received the following paint options:


NLA: Blade Silver

Optional: leather steering wheel cover

For 1988, C25A1 2.5L engines were replaced with C27A1 2.7L engines in sedans, and the following options were added:
- L trim level included ALB, 10-way power driver's seat.
- LS trim level included automatic climate control, SRS driver airbag, and info center.
- sedan two-tone paint options mostly replaced with single paint codes

Sedans received the following new paint options:


Coupes were transitioned to two-tone dashboards (black on top) and received the following new paint options:


NLA: Gothic Gray, Bristol Gray, Savanna Gray

In 1989, all sedans were facelifted inside and out. The following changes were implemented:
- sedan exteriors updated with new one-piece front headlamps, bumpers, grille, hood, trunk lid, taillights, and new alloy wheels
- sedan interiors received revised dash, door panels, center console
- sedan rear suspension changed to wishbone coilover design similar to coupes
- new seat cloth patterns added
- all coupes and sedans receive standard driver's side SRS airbag
- coupe L and LS models receive 10-way power driver's seat
- all LS models add 4-way power passenger seat

Sedans and coupes received the following new paint options:


NLA: Ascot Gray

For the final model year in 1990, several minor changes took place:
- black side mirrors replaced by body-color units on all models
- coupes received new hood with integrated body-colored grille
- coupe red/amber taillights replaced by red/clear units
- all LS models received woodgrain interior trim
- LS coupes featured a decklid spoiler

Sedans and coupes received the following new paint options:


NLA: Laurel Blue, Mirage Silver, Florence Blue, Ebony Black, Noble Silver

All USDM Interior Type Codes:
Type A = Black
Tybe B = Ivory
Type C = Off Black
Type E = Grey
Type H = Burgundy

Were there any special editions of the USDM Legend?
In 1989 approximately 10-12 KA3 coupes were turned into convertibles by Coach Building LTD for around $3K.
Review and pics here.

How are USDM Legends different than JDM or EDM Legends?
Unlike most other markets, the US offered a manual transmission with every engine and version available, including the 2.7L V6. Outside, the US mandated amber front corner lenses, where all non-US Legends came with clear front corner lenses, and US sedans had the split headlight/foglight design from 1986-88.
The dash Info Center/trip computer in LS models was never offered in other markets.
Options:
Fog lights, gold alloys, front end cover, CD player/changer

What changed during the production of JDM Legends?
The Legend was launched in 1986 as a sedan with the either the C20A1 2.0L V6 engine (Zi, Gi) or C25A1 2.5L V6 engine (Xi), cloth seats, and choice of manual or automatic transmission. Available trim levels were (in ascending order):

V6 Zi - 185/70/14 steel wheels, plastic wheel covers, cassette player, ALB, no sunroof/cruise
V6 Gi - automatic climate control, tilt-adjustable rear headrests, optional sunroof, dash radio controls, cruise control, infrared remote locking
V6 Xi - 195/65/15 16-spoke alloy wheels, optional sunroof

Paint Options (exclusive to Japan):
Ariel White Pearl (NH-504P) - 100/110
Formal Black (NH-505) - 100/110/112
Sirius White Pearl (NH-515P) - 100/112
Chateau Red Metallic (R-61M) - 100/112

On February 6, 1987, the coupe was introduced with the C27A1 engine, pistol-grip automatic shifter, power rear quarter windows
The following changes were also introduced to the sedan:

For the 1989 model year (starting 9/88 production) the sedans received an exterior facelift, and the following changes were introduced:
- Raised hood with larger "big grille" and extended chrome trim over headlights and corner lenses
- New dual-filament headlights with integrated foglights
- Shortened front and rear bumpers (60mm narrower/150mm shorter)
-New front double-opening armrests for sedans and coupes
- Introduction of Mi trim level as the new base model - 185/70/14 uncovered steel wheels, unique fender-mounted sideview mirrors, no dimmer or cruise control, AM/FM head unit
- Introduction of Ti Turbo Sedan, featuring a 2.0L turbocharged V6 engine and an automatic transmission. These can be identified with the additional "TURBO" emblem in the front grille and on the rear decklid, and inside by a special seat design.
- Introduction of Exclusive trim levels on the Gi, Xi, 2Dr Hardtop Coupe, and Ti Turbo Sedan, with optional premium leather seating, woodgrain center console trim provided by Tendo Mokko, dash radio control, SRS airbag, automatic climate control, premium double-DIN cassette head units, tilt-adjustable rear headrests, chrome taillight trim, and chrome door handles on sedans only.
The Xi Exclusive as the range-topping model was equipped with special chrome center caps, chrome side mirrors, leather shifter handle, "EXCLUSIVE" stitching on front seats, rear seats, and the backs of the front headrests, chrome shifter base trim, chrome interior door trim, optional separate rear A/C, and extended woodgrain trim on the instrument cluster bezel and front window switches

For the coupes, the following changes were introduced:
- New dual-filament headlights with integrated foglights
- All coupes received chrome trim above headlights and corner lenses
- Exclusive models came with similar leather seat stitching, chrome interior trim, and extended woodgrain trim as the Xi Exclusive
- All Xi and Ti models used 195/65/15 alloy wheels, while KA3 coupes came with 205/60/15 alloys

JDM Interior Codes:
Palmy Blue (B-44L)
Lofty Blue (B-46L)
Blue (B-59L)
Black (NH1L)
Gray Eight (NH50L) - sunroof tool
Gray Ten (NH74L) - trunk carpet
Star Black (NH120L)
Coast Red (R69L)
Mauve Red (R92L)
Smooth Red (R93L)
Silky Ivory (YR18L)
Coast Brown (YR92L)
Palmy Sand (YR94L)
Coast Sand (YR98L)
Sand (YR107L)
Smooth Beige (YR114L)
Sand (YR116L)
Medium Sand (YR120L)
B46L/B44L
R93L/R92L
YR98L/YR94L
YR114L/YR92L

How are JDM Legends different than EDM or USDM Legends?
JDM Legends came standard with power folding mirrors, no high-mount brake light, and optional 100h% wool upholstery. Japanese models could be optioned with a great many luxury items not available anywhere else. Here is a complete list of options and accessories:

KA1/2
Orange-lit front bumper pole
Multiple seat covers/half covers
Multiple floormats (one-piece rear sedan mats)
Dual rear sunshades
White-painted 16-spoke alloys
Sedan rear quarter window sticker
Trash container
Trunk wire shelf
Trunk liner
Trunk mesh cargo net
Roof racks (5)
Extended sunroof visor
Chrome valve stem caps
Amber lower front bumper foglights
Sound processors/amplifier

KA3
Trunk lip spoiler
Window visors
One-piece headlight/foglights
Gold badge package
Burlwood front door interior wood trim

KA4-6
Green-lit front/rear bumper poles
Multiple seat covers/half covers (including sheepskin)
Multiple floormats (one-piece rear sedan mats)
Separate rear A/C (V6Xi Exclusive)
Automatic headlights
Front seatback rear grab handles (on Exclusive models)
Window visors (brown/blue)
Headlight washers/wipers
Chrome door handles
Rear deck air refiner (at least 3 versions)
Multiple head units (+ 2 CD players/2 sound processors)
Car phone
Trash container
Personal box (replaces ashtray)
Trunk liner
Trunk mesh cargo net
Trunk luggage holder
Trunk mat
Snow chains with holder
Front/rear sensors
Rear lip spoiler with LED brake light
Extended sunroof visor
Lower door exterior chrome trim
Rear LEGEND panel with silver lettering
One-piece headlight/foglights
Rear quarter window sticker
Mudflaps with white LEGEND lettering
Blue LEGEND car cover
Windshield/mirror cover
Burlwood interior door panel trim
Gathers CD changer
Armrest compartment tray
Storage rear armrest
Gold badge package
V6 24-valve Turbo door decal
Motorized car jack
Child car seat
Plug-in flashlight
Honda blanket
Honda pillow
Trunk tool kit
Triangle
First aid kit
Floor-mounted e-brake
Footwell road flare
Rear radio controls

[NuclearSymphony]

What changed during the production of EDM/ROW Legends?
As with other markets, the European Legend was launched as a sedan badged "V6 2.5i". The C25A was the only engine offered with choice of manual or automatic transmission.
In 1987, the 2-door coupe was introduced with the C27A engine and automatic transmission only. At that time, the following items were modified:
1988
offered cruise control, aluminium alloy wheels, a driver's seat with power lumbar support, height, fore/aft and reclining adjusters, adjustable rear headrests, a 4 speaker stereo system provided by Philips and headlight wipers.
1989
1990

How are EDM Legends different than JDM or USDM Legends?
The radio volume control rocker switch and preset radio scan button installed on the instrument binnacle was not offered in Europe, although they did receive options such as headlight wipers, heated seats (also available in Canada), a unique woodgrain manual climate control panel, and a rear deck with storage bin in sedans.
All EDM Legends came with side marker lights not seen in any other market.

Drivetrain
Engines
C20A1 - 2.0L SOHC V6 (JDM only)
Bore/Stroke: 82x63mm
Compression Ratio: 9.2:1
Horsepower: 143 @ 6300rpm
Torque: 127 @ 5000rpm

C20AT - Turbocharged 2.0L SOHC V6 (JDM only)
Bore/Stroke: 82x63mm
Compression Ratio: 9.0:1
Horsepower: 187 @ 6000rpm
Torque: 177 @ 3500rpm

C25A1 - 2.5L SOHC V6
Bore/Stroke: 84x75mm
Compression Ratio: 9.0:1
JDM/EDM Horsepower: 163 @ 6000rpm
JDM/EDM Torque: 155 @ 4500rpm
USDM Horsepower: 151 @ 5800rpm
USDM Torque: 154 @ 4500rpm

C25A2 - 2.5L SOHC V6 (EDM only)
Compression Ratio: 9.6:1
Horsepower: 173 @ 6000rpm
Torque: 163 @ 5000rpm
Rover 825i M/T Horsepower: 173 @ 6000rpm
Rover 825i M/T Torque: 163 @ 5000rpm
Rover 825i A/T Horsepower: 167 @ 6000rpm
Rover 825i A/T Torque: 160 @ 4000rpm

C27A1 - 2.7L SOHC V6
Bore/Stroke: 87x75mm
Compression Ratio: 9.0:1
JDM Horsepower: 177 @ 6000rpm
JDM Torque: 166 @ 4500rpm
EDM Horsepower: 175 @ 6000rpm
EDM Torque: 165 @ 4500rpm
Rover 827 Coupe Horsepower: 169 @ 5900rpm
Rover 827 Coupe Torque: 165 @ 4500rpm
USDM Horsepower: 161 @ 5900rpm
USDM Torque: 162 @ 4500rpm

C27A2 - 2.7L SOHC V6 (EDM/Rover only)
Compression Ratio: 9.4:1 (with 99 RON fuel)
Rover 827/Sterling Horsepower: 177 @ 6000rpm
Rover 827/Sterling Torque: 168 @ 4500rpm

C27A4 (1995-1997 Accord V6) - 2.7L SOHC V6
Compression Ratio: 9.0:1
Horsepower: 170 @ 5600rpm
Torque: 165 @ 4500rpm

What kind of gearboxes were available in the Legend?
There were several different gearboxes fitted to the Legend. Manual transmissions were only fitted to the 2.7L engines in the US. The G3E4 5-speed manual had the following ratios:
C20A - 3.250/1.857/1.346/1.033/0.794/R 3.000/Final 4.200
JDM/EDM C25A - 2.923/1.789/1.222/0.909/0.702/R 3.000/Final 4.200
US C25A - 2.923/1.789/1.259/0.968/0.750/R 3.000/Final 4.200
US C27A - 2.923/1.789/1.222/0.909/0.702/R 3.000/Final 4.200

The L5 4-speed automatic had the following ratios:
1986-1987 C20A - 2.647/1.555/0.971/0.682/R 1.904/Final 4.400
1988-1990 C20A - 2.705/1.629/1.058/0.750/R 1.904/Final 4.533
C20AT - 2.764/1.500/0.972/0.707/R 1.904/Final 4.714
JDM C25A - 2.647/1.464*/0.971/0.682/R 1.904/Final 4.200
JDM C27A - 2.647/1.448/1.028/0.707/R 1.904/Final 4.266
US C27A - 2.647/1.555/1.028/0.777**/R 1.904/Final 4.266
*US C25A had a 1.555 gear
**Coupes had a 0.707 gear

Chassis
How is the Legend suspension set up?
The initial suspension system of the Legend used MacPherson struts with unequal-length control arms in front and a semi-trailing arm design in the rear. Antisway bars measured 26.5mm front and 12.5mm rear. In 1987, the coupe debuted with MacPherson struts front and rear and 27.4mm front/14.7mm rear antisway bars, and in 1989 the sedan followed suit. Steering is rack-and-pinion, with speed-sensitive power assist and an overall ratio of 15.9:1 on the coupes and 17.6:1 on the sedans.

What kind of brakes does the Legend have?
Every Legend has four-wheel disc brakes. The vented front rotors on 1986-1987 sedans measure 10.3 inches (262mm) in diameter and the solid rear rotors measure 10.16 inches (258mm). Sedans from 1988-1990 and all coupes upgraded to 11-inch (280mm) rotors in the front. ABS was available on L and LS models.

What are the factory wheel and tire sizes for the Legend?
All models are fitted with various tire sizes and several different wheel options.
JDM V6 Mi - 5x14" steel wheels on 185/70/14 tires (uncovered)
JDM V6 Zi - 5x14" steel wheels on 185/70/14 tires with plastic wheel covers
JDM V6 Gi - 5x14" steel wheels on 185/70/14 tires with plastic wheel covers
JDM V6 Xi/Ti - 5.5x14" 16-spoke alloy wheels on 195/65/15 tires
USDM KA2 sedans - 15x5.5" 16-spoke alloys on 205/60/15 tires
All KA3 coupes - 15x5.5" 20–spoke turbine alloy wheels on 205/60/15 tires
USDM KA4 - 15x5.5" 20-spoke alloys on 205/60/15 tires
All 15x5.5" wheels have a +40 offset. Optional on the 1990 LS coupes were special gold “throwing star” alloy wheels. A JDM option was a white-painted version of the 1986-88 16-spoke wheels.

Performance (manufacturer claims)
1987 USDM KA3


JDM Models
C20A M/T (Mi/Zi)
0-60 km/h: 8.8
400m: 16.8

C20A A/T (Mi/Zi/Gi)
0-60 km/h: 10.0
400m: 18.2

C20AT (Ti)
0-60 km/h: 8.8
400m: 16.9

C27A A/T (Xi)
0-60 km/h: 8.5
400m: 16.5

The Japan Honda dealership carries three major names: Honda Primo, Honda Verno and Honda Clio. Civics are sold at Honda Primo and Integra, S2000, & NSX are sold at Honda Verno. Honda Clio dealt the Accord & Legend.

Though Honda Japan does often refer to production dates by the month and year, individual vehicles sold are usually just referred to as being of the production year that they were built. So though a Legend might have been built May of 1991, it would just be called a 1991 Legend, not a 91.5 Legend.

For those who might be confused, that means a 1995 Legend Coupe (KA8) from America, had it been sold in Japan would be called a 1995 because it was built in the summer of the 1994. Here in the US we go by "model years" instead though. A production year and a model year do not always match up.

GENERAL INFO

Main Relay- Location for this is under the driver side dash, and is a little black box-OEM part number for main relay- MITSUBA RZ-0063. It has an 8 pin socket with the #6 pin missing. Some may prefer to get a main relay from a wrecker or salvage yard, rather than purchase new for around $60.

Symptoms for Bad Main Relay-
1. Car wont start off its own but if jump started, will fire right away.
2. Not clicking when turning key.
3. If you have Ground but no Power.
*note - a main relay usually only fails when the weather is really hot. You might have a hard start every now and then, but not enough to really cause you any concern, but when an ignitor or a coil fails, the car won't start at all until it cools down and that will be a major concern.


WHEELS:
Bolt pattern - 4x114 +50 offset
Hubcentric ring - 64.1mm
Wheel lug nuts - 12x1.5mm thread pitch
Wheel hub nuts - 36mm

BRAKES:
KA2 - Front 261x21mm rotors; rear 260x10mm rotors.
KA3/4 - Front 282x21mm rotors; rear 260x10mm rotors.

Make sure your brake shims are on right because Legend brakes like to scream if you don't set them up right, or if you use cheap pads.
One method that works better, but does not eliminate squeal altogether is to use Permatex RTV Form-A-Gasket / Copper High Temp to adhere the pads to the calipers. Dab a little bit on the backs of the pads where they rest against the caliper, and install them while the Form-A-Gasket is still wet. This will hold the pad, but not with a death grip, so you will have no problem removing them. Additionally, the Form-A-Gasket is rubbery and keeps the pad and caliper from vibrating against each other, while also raising the overall mass of the pad and lowering the resonance, reducing the pitch and output of the sound from vibration.

CHASSIS:

OEM sway bars: KA2 26.5mm front, 12.5mm rear; KA3 - 15mm rear, KA4 - 12mm rear.

ENGINE:

C25/27 intake ports - 33mm; exhaust - 27.5mm
C25/27 heads - 42cc combustion chamber volume
C27A1 fuel pressure 35-37PSI

Worldwide part differences:
Cams, heads, and pistons are responsible for different compression ratios, emissions standards, and power output. Intake manifolds, exhaust manifolds, injectors, FPRs, etc, that are not listed below are the SAME across all markets globally.

C25A1 cams 14100-PH7-000
Heads (US) 010/030; (non-US) 010/753; (JDM) 000
Pistons 13100-PH7-000

C25A2 cams 14100-PH7-751 (5M); 14100-PH7-761 (4A)
Heads 751/753
Pistons 13101-PH7-750

C25A3 cams 14100-PH6-010
Heads 753
Pistons 770

C27A1 cams 14100-PL2-000
Heads 12100-PL2-000
Pistons 13100-PL2-000
ECU (EDM) 37820-PL2-G02 (5M); 37820-PL2-A17/18/19 (4A)

C27A2 cams – SAME
Heads 750
Pistons 750
ECU B03 (5M); B13 (4A)

ALL connecting rods are identical C25/C27
C20A rods: 13210-PH6-000)


Vehicle Identification (VIN)

The following is a breakdown of what your 17-digit Acura Legend Vehicle Idenfication Number (VIN) denotes:

Digit 1-3 - Manufacturer
JH4 = Honda Motor Co. LTD

Digit 4-6 - Body Type
KA1: Japan-spec sedan (RHD), 1986-1988
KA2: Japan-spec sedan (RHD), 1986-1987
KA2: European/Australian-spec sedan (RHD/LHD UK), 1986-1987
KA2: American-spec sedan (LHD), 1986-1987
KA3: Japan-spec coupe (RHD), 1987-1990
KA3: European/Australian-spec coupe (RHD/LHD UK), 1987-1990
KA3: American-spec coupe (LHD), 1987-1990
KA4: Japan-spec sedan (RHD), 1988
KA4: European/Australian-spec sedan (RHD/LHD UK), 1988
KA4: American-spec sedan (LHD), 1988-1990
KA5: Japan-spec sedan (RHD), 1989-1990
KA6: Japan-spec sedan (RHD), 1989-1990
KA7: 91-95 4 Door Sedan
KA8: 91-95 2 Door Coupe
KA9: 96-04 RL

Digit 7 - Body Style/Transmission Type
1 = coupe, manual
2 = coupe, automatic
5 = sedan, manual
6 = sedan, automatic


Digit 8 - Option/Trim Package
3 = 86-90 Standard (No Sunroof)
4 = 86-90 Standard (Sunroof)
5 = 86-90 Leather Interior
6 = 86-95 L Trim
7 = 86-95 LS Trim
8 = 93-95 GS Trim
9 = 93-95 SE Trim

Digit 9
Check digit

Digit 10 - Production Year
G = 1986
H = 1987
J = 1988
K = 1989
L = 1990
M = 1991
N = 1992
P = 1993
R = 1994
S = 1995

Digit 11 - Assembly Plant Location
C = Saitama, Japan

Digit 12-17
Individual vehicle serial number

ECU Codes

Getting that little Check Engine lights on your dash may seem a little discomforting. In reality it is really a miracle of engineering and computer technology. Instead of randomly pocking in vast amounts of wires, sensors, and mechanisms in such complex car as a Legend, this little light tells you that your computer knows exactly what is wrong with the car (most of the time). That means the exact sensor or gate has been pin-pointed as being either partially disconnected or simply out of acceptable range.

On 1986-90 Legends, the control unit is located under the passenger seat on sedans and under the passenger foot well carpet on the coupes. The engine CPU is the form of an aluminum box with a little plexiglass window. All you have to observe is a little red LED. With the car either running or the key in the ON position, count the blinking of the light. The light will blink displaying all the codes in sequence and then repeating them.

The code numbers are read by counting the number of blinks between longer pauses. On 1986-1990 Legends, the code number is indicacted by a series of rapid LED blinks between longer pauses. The position of codes in a sequence can be helpful in doing diagnostics. A display showing 1-1-1-pause-9-9-9 indicates two problems occurring at different times. A sequence showing 1-9-1-9-1-9 indicates two problems occurring at the same time.

Sometimes it may be useful to reset the ECU memory. Although that maybe done by removing the battery for around 20 minutes or so, this will also kill your clock and radio presets. A more elegant way is to simply remove the alternator fuse for 20 seconds.

Below are trouble codes for 86-90 Acura/Honda Legends:

Code # Explanation
1 Front Oxygen Sensor
2 Rear Oxygen Sensor
3 Manifold Absolute Pressure Sensor
5 Manifold Absolute Pressure Sensor
4 Crank Angle Sensor
6 Coolant Temperature Sensor
7 Throttle Angle Sensor
8 Top-Dead-Center Position Sensor
9 Number 1 Cylinder Piston Position
10 Intake Temperature Sensor
12 E.G.R. System
13 Atmospheric Pressure Sensor
14 Electronic Idle Control Module
15 Ignition Output Signal
17 Vehicle Speed Sensor
18 Ignition Timing Adjustment

VACUUM DIAGRAM:


RADIO WIRING DIAGRAM:


SPEAKER SIZE CHART:


UNDERHOOD FUSE BOX DIAGRAM:

[NuclearSymphony]

AFTERMARKET

GENERAL:
As with most aftermarket parts, you usually get what you pay for. Cheap Ebay parts (using that term as a generality, as some very quality items can be found there) are at your own risk. As our own Legend Fut used to say: "Pay for the best, and cry once."

BRAKING:
Fluid - Honda fluid recommended for most street applications. Track or competition events may necessitate racing fluid with a higher boiling point, such as Motul or RBF.
Pads - OEM pads are great for daily use. Aggressive street/light track applications may need to step up to Hawk HPS or EBC, while heavy track/endurance use will require more aggressive pads like Hawk HP+.
Stainless steel brake lines - Technafit or Goodridge recommended.
Rotors - OEM blanks are fine for nearly any use up to a track event. For extended competition with prolonged repeated braking, step up to slotted rotors from StopTech or Brembo (paired with better pads).
Larger rotors and calipers will increase stopping power and fade resistance, but will also add weight. Keep in mind, larger rotors will also likely require different caliper brackets at the very least.
KA2 - upgrade front brakes to KA3/4 or 98-02 Accord (260x23mm rotor).
KA3/4 - Front brakes from 92-96 Prelude VTEC (282x23mm rotor); 95-97 Accord V6 (282x25mm rotor); Rover 825/827 (285x21mm rotor); 98-99 Acura CL 3.0 (282x25mm rotor)
DBA (Disc Brakes Australia) makes a 282x28mm rotor in the correct bolt pattern - P/N 2514.
Project Mu front rotor (282x25mm) - P/N SPPH106-S6.

SUSPENSION:
Please keep in mind, most of these are NO LONGER MADE. These part numbers are for reference.

KA2
Intrax springs (-1.75"F/-1.5"R) - P/N 10.1.008
B&G springs (-1.6"F/-1.4"R) - P/N 041001
PI springs for Rover 825 (-35mm F/R) - P/N 75-002 on Ebay UK
KYB GR-2 shocks (Front - 341113L / 234044R; rear - 234044L / 234045R)
KYB shock mounts - SM5058 F/R
Rover/Sterling rear 16mm sway bar (need those end links or Moog K90342 and K90343)
'96+ Rover Vitesse front 26mm and rear 21mm sway bars
Strut tower bar

KA3/4
B&G springs (-1.4” F/R) – P/N 041002
Eibach Pro-Kit springs (-1.2” F/R) – P/N 4009.140
Intrax springs (-2.0”F/-1.75”R) – P/N 10.1.005
ST springs (-1.5” F/R) – P/N 60425
Vogtland springs
RS-R Ti2000 Down springs (front: -35-40mm, 4.60 kg/mm; rear: -25-30mm, 3.40 kg/mm) – P/N H160TD/227309
Esperia Super Active Down springs (front: -55-60mm, 4.8kg/mm; rear: -45-50mm, 2.8kg/mm) – P/N ESH-155
KYB GR-2 shocks – Front 341112R, 341113L; rear 341116
KYB shock mounts – P/N SM5058 and SM5059; boots – SB108 and SB107
Tokico HP struts – P/N HU3653, HU3654, HU2826 (both fronts and rear)
Bilstein HD struts – P/N 24-011990, 24-012003, 240-11921 (both fronts and rear)
Strut tower bar
Tanabe 20mm rear sway bar – P/N TSB009R
Energy Suspension poly end links (KA4 only), front/rear sway bar bushings (will need to re-use OEM bushing brackets or trim the ES brackets to fit).
Ground Control adjustable sleeve system – they use fixed-rate Eibach springs tailored to your driving style. Made to work with OEM or aftermarket shocks.

*Get an alignment immediately after lowering your Legend. Even though there is nothing the mechanic can do in terms of correcting your alignment (unless you get a camber correction kit), you can at least know how severe your settings are.

Cutting Springs
Springs are made for individual applications, which are designed to support the specific weight of the cars they are applied to. When you change this spring rate by cutting or burning the coils, they stop becoming effective at supporting the full weight they were originally intended. The engineering that went into developing that important part of your car's suspension and handling is now rendered ineffective. At best, you may bottom out a lot or just endure a very stiff and jarring ride. At worst, your car may lose control and hit something or someone.

Shocks
With only a moderate amount of lowering (1.5" or less), your factory shocks should still be able to handle the increased spring rate and retain a comfortable ride, if they are still working properly. Anything lower will most likely require high performance shocks to handle such a drastic change, as your OEM shocks may stop becoming effective and prematurely wear out. As with most older cars, when in doubt, upgrade your shocks, even if only to OEM replacements.

WHEELS:
For maximum performance, bigger is not always better. Larger diameter wheels and lower profile tires do significantly better in cornering because they flex less and stick better, but this is all at the expense of acceleration ability, and most of us want to accelerate out of curves and turns. Not to mention the obvious: larger wheels and tires can add more weight!
It may very well be that a 15x7 or 16x7 wheel and sticky tires will do much better for your application in terms of performance than a large, heavy wheel that serves more for appearance. Something else to keep in mind is that extremely lightweight and racing wheels are often not as strong as normal street wheels. Racing wheels are meant for use at the track, where there are no speed bumps, railroad tracks, potholes, or curbs.

Spacers - as with every other part of your car, spend the money for quality items. Porsche and BMW track machines use H&R spacers all year round, with zero failures. Tales of spacers breaking or damaging the car are usually indicators that someone bought the wrong type or a cheap brand.
These are great for getting that perfect stance and fitment without having to buy new wheels.
H&R Trak+ spacers - 5mm 1064640, 10mm 2064640, 15mm 3064640

5-lug conversion:
Front 97-01 Prelude hub and bearings (44600-S47-000, 44300-S84-A02)
Rear 99-03 TL hubs (42200-S87-C52)

TIRES:


DRIVETRAIN:
Short throw shifter
Poly shifter bushings (shifter base and linkage end bushings are same as 94-01 Integra)
Lightened flywheel (OEM = 23lb.)
Stainless steel clutch line

EXHAUST:
OEM catalytic converter replacement: Magnaflow 22625 (49-state legal); 36625 (50-state legal)
OBX headers
Stromung cat-back

ENGINE:
K&N drop-in filter (P/N E-0999)
Cold air intake
Bored throttle body (Maxbore)
Aluminum crank pulley
Colder thermostat (2001 Integra aftermarket T-stats fit); Mishimoto Racing 155-deg (for C27A4)
Gude C27A4 cams (HAC505) - never tested in a Legend
Paeco Imports claims to make cams and a full 3.0L stroker kit, but to date has never actually produced or sold any (likely these are simply prototype estimates, with no actual buyers to fund the parts).

FORCED INDUCTION:
Only a handful of first-generation Legends have had a turbocharger added. Forced Air Technologies in Arizona was one of the first and most widely-known. The kit utilized a Garrett GT25 setup featuring a Vortech rising rate fuel pressure regulator and RC Engineering 320cc injectors. With stock internals (C27A1) and stock compression (9.0:1) this kit yielded 223 whp and 220 wtq at 8-psi. This kit was installed and tested on a 1989 Legend coupe L (Gold Rush) as a custom one-off project. A production kit was never assembled, and FAT no longer exists.

To date, only one supercharger has ever been installed on a first-generation Legend.

ENGINE SWAPS:

JDM engine swap - C27A: retain rear valve cover, air suction valve (intake), and front exhaust manifold (if no spot for EGR lift sensor).

The C27A1 was used as the test engine for the NA1 Acura NSX. For production, the NSX received the C30A (2977cc V6, DOHC, four valves/cylinder with VTEC, bore & stroke: 90.0 mm x 78.0 mm, compression ratio: 10.2:1, power: 270 hp @ 7100 rpm, 210 lb-ft @ 5300 rpm). Since the C30A is externally identical to the C27A1, it was theorized that the NSX engine could be swapped into the Legend. It has been successfully completed by Car2n (LegeNd-SX), including a Comptech supercharger.

Also TTC27A4 Accord
Another 1 or 2 turbo Legends
C20AT swap

INTERIOR:
Redline Goods leather shifter boots + armrest covers
Aluminum pedals (Autovation.net, OEM Acura TL-S, Mugen)
LS Auto Climate Control swap

EXTERIOR:
KA4 EDM clear corner lenses - P/N 33600-SD4-965 and 33650-SD4-965


Additional Media/Articles:

Consumer Reports (1989.07) - Japan's Best

Motor Trend (1988.02) - All Promises Have Been Kept

Motor Trend (1988.05) - Acura Legend Sedan LS

Motor Trend (1988.09) - Acura Legend Coupe LT

Motor Trend (1989.11) - Top 10 cars of the 80s

Motor Trend (1989.11) - Top 10 new car buys_Import

Motor Trend (1990.09) - Acura Legend Coupe vs Infiniti M30 Coupe

Please note: this is a WORK IN PROGRESS. I've been compiling this information for years, with the help of several forum members and a ton of research. Several items will be slightly inaccurate or incomplete for some time to come, until I have time to finish editing and linking everything properly.

If you are able to fill in any of the blanks (for example, paint code corrections on the earlier models, etc.), and you have a viable source (ie. from Honda/Acura, not something you once heard of), please feel free to send me a PM with the correct information. Please DO NOT reply to this thread - you've seen what happens. A bunch of random posts clutter up the information.

Several categories are still to arrive, including links to DIYs and OEM/aftermarket parts availability. Bear with us as we try to finish this up as soon as we can!

Thanks for looking.