Hey. As it says 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. Even though it says it is in open loop it seems to be reading off the o2 sensors anyways. 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 seem to be reading fine. 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 even though the van sat all night. Any advice would be greatly appreciated!!!!! Thanks!
I had it on my scanner also. Even though it says it is in open loop it seems to be reading off the o2 sensors anyways. 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 seem to be reading fine. 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 even though the van sat all night. Any advice would be greatly appreciated!!!!! Thanks!