91 6cyl o2 problems - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 01-13-2004, 12:22 AM
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91 6cyl o2 problems

I need some help please. I have a 91 Sahara 6cyl with 126K on it. It has never been rebuilt. Its' check engine light comes on. I have scanned the computer and it indicated a problem with the o2 sensor in bank 1 pre cat. I replaced the o2 sensor, however the check engine light still comes on. The motor runs irraticly until warm. I sprayed chemtool arround the throddle body no leaks detected. The valves seem to be relatively noisey. Is it possable that there is a problem in the head? Or are there other posabilities? Thanks in advance for your help [img]images/graemlins/confused.gif[/img]
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post #2 of (permalink) Old 01-13-2004, 10:40 AM
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Re: 91 6cyl o2 problems

1. Have the back pressure checked at the tailpipe.
2. Monitor the voltage on the O2 sensor.
3. It could be that you've got a problem a clogged cat.
4. Pull and clean the IAC.
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post #3 of (permalink) Old 01-13-2004, 05:51 PM
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Re: 91 6cyl o2 problems

I am not sure what an IAC is or where it is located. That will probably be the first thing I do as the jeep just passed smog so I am fairly certain it isn't the cat. On second thought because I said that it probably is. Thank you for responding.
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