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Old 05-06-2013, 04:04 PM   #1
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rough idle hard shakes, trouble shooting headache

Hey, my name is maurice from miami I'm new here and in need of some time saving advice.

I have a 91 gt that I bought some time back as a project I'm trying to finish her up but now I have the problem of a rough idle. The smog system has been ripped out and there are no o2 sensors the and brake booster has a leak. Its a bone stock motor with bbk longtubes. Unfortunately the previous owner welded the o2 sensor holes. Is there a way to bypass the o2 sensors, and can the booster vacuum leak cause the rough idle?
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Old 05-06-2013, 05:18 PM   #2
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Not sure off hand about bypassing the o2 sensors but a leaking brake booster can definitely cause a rough idle.
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Old 05-07-2013, 10:09 PM   #3
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Thanks a lot for the input guess I'm just going to have to find a way to get o2 sensora in those headers
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Old 05-08-2013, 08:06 PM   #4
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the computer relies on the o2's, aftermarket tuner can shut them off but I suggest using a wideband to tune if you do that and lock the computer into open loop.

as stated earlier brake booster is a definite problem. and you can buy o2 bungs and have a shop weld them in for you, or better yet just buy an aftermarket catless h-pipe.
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Old 05-11-2013, 01:18 AM   #5
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So by locking it into an open loop it will always mix the air and fuel at one setting instead of making adjustments?
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