james.weitman

I have a 92 pickup 4x4 ext cab, 3.0 6 cyl, manual trans. My problem is this my truck will crank and run but not at it's best, has a hesitation and not as much power as it used to. Sometimes when you shut it off it will not crank back, has fire, so thinking fuel problem, I have replaced fuel pump, COR relay, when I jump the diagnostic plug from B+ to FP, the fuel pump still doesn't run. You can wait 20-30 minutes and it will crank. Help please. thanks James

wyoming9

iTrader: (1)

Both pump and COR were brand new??

What about your fuel filter has that been changed??

Switch in the AFM working that keeps the run coil energized in the COR

So changing these things both the pump and the COR tested bad??

james.weitman

The AFM is new, the fuel filter has been replaced. I didn't test the COR or fuel pump, just swapped them, thinking as old as they were no harm.

wyoming9

iTrader: (1)

Try and get your terms correct

Crank means the engine is turning over but has not started

Runs means the engine has started

Just what brought the start of all this on??

You have tested for spark and it is good??

I would look at all you connections they can be corroded that can`t be seen by the naked eye.

physical wire damage ??

How much gas is in your tank??

james.weitman

Thanks wyoming9, I'm about to think it is a wiring problem, I'm now looking at replacing the engine harness, it has several bad looking places and splices, what brought this on, not sure, just started doing it randomly every few days it would try to start then seem to flood out and then would not start, you could give it a few minutes and it would start up and run. It has gotten increasingly worse.