Posted by MeAnthony on August 22, 2008 at 06:40:27 from (4.229.144.230):
The patient: 1990 Jeep Cherokee, straight 6, auto, 4x4
The symptoms: runs rough, stalls at idle. This is under normal driving conditions. If you drive more aggressively, the problems decrease/disappear.
Already checked fuel pressure, so pump/filter should be good. Changed TPS and MAP with known-good used parts. Vacuum hoses look good. Cap and rotor good.
Auto parts stores say they can't check vehicles older than 1996 (ie: no OBD I systems, according to them)
There is no 'check engine' light, so I can't cycle the ignition switch to get the codes.
There is an 'emiss maint' (emissions maintenance) light, but it doesn't work. Doesn't come on at all, even when the key is first turned on and it's supposed to blink so you know the system is functional. Bulb is good.
Does this light serve the same purpose as the 'check engine' light for retrieving codes?
Also went to a salvage yard/garage that does have an OBD I scanner. No luck here either. This guy said "1990 is the crossover year from Chevrolet to Chrysler, and the computer won't store any codes".
How is that possible?
Is there any other way to read the codes?
I was thinking it could also be a vacuum leak at the intake, or possibly the oxygen sensor. However, I don't have a spare O2 sensor and don't want to buy a $50 part if that isn't the problem.
Opinions and suggestions are appreciated. Thanks for your time.
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