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Old 12-01-2019, 06:09 PM   #1
vayankee
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Default Need advice re: removing exhaust manifolds from Legend L

posted my two Legends for sale awhile back and am glad to say that there still are some avid Legend lovers out there, in Virginia and Maryland. Pretty good response at my asking price, though none were actually looking to take the disabled '92L. That's not a big problem, but something not so good has come up.

Short backstory is that the car needs at least the left oxygen sensor, and my mechanic could not get the long-serving left or right sensors loose. Gas mileage is suffering a bit and so is engine performance, and the check engine light comes on.

I am wondering about replacing the left exhaust manifold so that things get better and the check engine light will go out. There are manifolds available online for 50-100.00

I read some posts here about trouble freeing the Y exhaust piece bolts. Dropping the cat and pipes seems necessary, and the manifold shield, of course. But how about getting the manifold itself out from under the car? Are there problems getting the manifold around transmission or drive shafts?

I would appreciate any input on this-Thanks!
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Old 12-02-2019, 01:13 PM   #2
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you should try getting the o2 sensor out.. much easier job and not bad..

if your going to remove the manifold obx headers on cause if your going to take 4+ hours to remove a manifold you might as well gain power
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Old 12-02-2019, 02:25 PM   #3
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Originally Posted by GreekPower View Post
you should try getting the o2 sensor out.. much easier job and not bad..

if your going to remove the manifold obx headers on cause if your going to take 4+ hours to remove a manifold you might as well gain power
Yes, I have seen people here refer to OBX headers. But I am trying to sell the car without further expense on my part. And I learned today that my two most reliable mechanics don't want to take on an exhaust manifold project - fear of the unknown, such as broken studs, and then replacement heads.

Thanks for the suggestion though. I will pass it on to my prospective buyers.
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Old 12-02-2019, 05:59 PM   #4
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PB blast the sensor threads....warm up slightly....PB blast the senor threads...warm it up slightly....PB blast the sensor threads......warm it up completely.....cut off the wires and go at the SOB with a full 13/16 socket with cheater.
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Old 12-04-2019, 07:56 AM   #5
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PB blast the sensor threads....warm up slightly....PB blast the senor threads...warm it up slightly....PB blast the sensor threads......warm it up completely.....cut off the wires and go at the SOB with a full 13/16 socket with cheater.
Yep, "that's what they all say." But you are talking about heating it from underneath, I take it? To do that well may require dropping the exhaust system, or whatever, I suspect. So I am taking the car in to a muffler place on Friday. Fingers crossed!
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Old 12-04-2019, 08:31 AM   #6
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Years ago I removed the front exhaust manifold on my G1 Legend (which I no longer own).
The way I did that was to remove the radiator to get more space then it is fairly easy to remove the manifold. There is enough room to remove the rear manifold. It is necessary to disconnect the exhaust pipes from the bottom and if that is all rusted up it may be a problem. (Though an exhaust shop can use a torch to loosen them.) Once the manifold was out I put a box end wrench on the O2 sensor and hit it with a big (3 pound) hammer to loosen it. I don't think the exhaust manifold studs are likely to break off in the heads (since they are steel in aluminum which won't tend to rust together) but likely the nuts will be stuck on the studs thus the hardware may need to be replaced. I have generally been able to get the nuts of the studs by locking a pair of nuts to hold the stud. More recently in a rebuild of a BMW engine I drilled a hole in a piece of angle iron and attached the exhaust studs to that with a pair of nuts and took the nuts off the studs with an electric impact wrench.
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