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I have a 2000 GMC Savana 3500 5.7L V8. From time to time it runs very rough where it shakes the whole van and has no power. Here is what I have done so far: Replaced spark plugs, wires, distributor cap and rotor, replaced all gaskets from the lower intake and up, new fuel filter, different spider injector assembly. Fuel pressure tests out fine. Compression tests out fine.
I had it on my scanner also. Most of my issues are with bank 1 I believe. The short term fuel trim bank 1 will sit at -30.5 forever even though the o2 sensors on that side are reading a lean fuel mixture. Bank 2 everything seems alright.
Could there be a problem with the computer cutting fuel to bank 1 for no reason. Sometimes when I first start it in the morning right away the fuel trim will drop to -30.5. Other times it will run fine for a while and then out of no where just start dropping to -30.5. Any advice would be greatly appreciated!!!!! Thanks!
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[quote=”JTF” post=105239]Checking and seeing what the injectors are doing is another way of checking the PCM. I haven’t found anything yet to help you. I agree with 13aceofspades13 about the PCM maybe faulty. What I can’t understand is; why the PCM is only having issues on that O2/fuel trim and not anything else.[/quote]
this has me scratching my head too!
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