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Unknown problems with 1998 GMC suburban 5.7
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Question
Matt Harshaw
I just purchased a 1998 GMC Suburban 2wd 5.7L
I need to get it to pass emissions for the Tag. I was an emissions inspector for 8 years and have about a decade of service under my belt. Here is what I've come across.
Check engine light was on for P0452 when I bought the car. No problem. I dropped the tank, found the wires to the tank sensor were rubbed through. Easy fix. (Done 1 week ago)
The only other problem was a slight bogging when getting on the gas from a dead stop while in drive. (intermittent)
Found an air leak on the intake at the fuel spider plug o-ring. (sigh) so I pulled the intake off replace the gaskets (the suspected o-ring was in pieces). (yesterday)
The big problem, though, is the monitors will not set. after the initial replacing of the fuel tank sensor, I drove through the GM drive cycle multiple times. No MIL came on, no codes, etc. The only monitors that set were the initial 3 (comp, misfire, fuel). Even after 20 full cool down and starts and 200+ miles, no other monitors would set. This was before the intake gasket replacement. and is still an issue
After the intake gasket replacement, I got a code for the coolant temp sensor (P0118). Yet it has not tripped the light, even though the code is not pending. (not too worried about this, as the wires are old and should be an easy fix, but thought it may be pertinent to the computer issue)
Then for just a moment this afternoon I had a P0020 at start up but it went away when started up.
Any advice or insight would help.
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