Subject: Re: New Member by BillH on 2010/4/26 13:36:35
Quote:
bogus wrote: First off, 92 and 93 LT1's don't have crank sensors.
I am not a fan of the O2 sensors being the problem, but its not a bad place to start. I am a fan of Denso O2s. Hate Bosch. Junk.
I am not betting on a bad ground wire. If so, it would run poorly all the time.
I agree with checking temps, however, if the temp sensor on the waterpump fails, it throws a code, H15.
Which leads to the final question: Does the SES light come on at startup? If not, then the bulb may be blown.
Yep, no crank sensor.
Ya know, the 92 FSM says that if the O2 on an LT5 has low readings, the ECM will go back into open loop (and throw codes). But that's not mentioned for the LT1 (doesn't mean it won't happen). Almost sounds like the car runs fine in open loop, crappy in closed, goes back to open and runs OK for 5 min. But again, no codes.
Mike, are you pulling codes on the dash or with a scanner?
Peddling- is that crusing at 1/4 throttle? And how long until it goes back to running OK?
When it starts running bad, no missing, bucking or monentary engine shutoff, right?
I do think the fuel pressure should be checked while driving, if nothing else, you will eliminate that as part of the problem.
