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I have a 2000 Chevy G2500 Express van 5.7l. in for stall issues. It usually stalls when it is cold, but has twice for me as well at 140deg. prior to thermostat opening. I first thought it may be a crank sensor since it just shuts down. Fuel pump works and replaced the FP Relay just to be sure. It starts right back up with no hesitation and runs fine - no miss or lack of power. I also cleaned the IAC solenoid, MAF and throttle body. Plugs and wires, cap, rotor air and fuel filter all replaced 10,000 miles ago, as well as intake manifold gasket. Ran fine until 3 weeks ago.

Does anyone have any thoughts?

mtkauto wrote:I have a 2000 Chevy G2500 Express van 5.7l. in for stall issues. It usually stalls when it is cold, but has twice for me as well at 140deg. prior to thermostat opening. I first thought it may be a crank sensor since it just shuts down. Fuel pump works and replaced the FP Relay just to be sure. It starts right back up with no hesitation and runs fine - no miss or lack of power. I also cleaned the IAC solenoid, MAF and throttle body. Plugs and wires, cap, rotor air and fuel filter all replaced 10,000 miles ago, as well as intake manifold gasket. Ran fine until 3 weeks ago.

Does anyone have any thoughts?

Whats the fuel pressure when it stalls? What is the computer reading temp wise when it stalls. Does it lose spark or noid when it stalls?

I've replaced a few PCM's on these from water intrusion. They make a deflector that helps it from happening again. The last one I had just randomly shut off. I called the PCM on that one and the guy took it to the dealer cause it was under warranty. 800 bucks later it was fixed. When we got it back, it had a new PCM too. LOL!

i agree with the pcm randomly shutting down. they would also cut out cylinders from time to time. another thinh i've found is the harness along the transmission cross member. there is a plug that corrouds on the inside. as a rule i've found that at the beginning they will force a stall and will restart right away, next step is stall and long crank, last is stall and that's all folks. does this have a remote starter and the reader has been removed from cylinder and key taped to it? this is supposed to read only when starting but i've had a few that caused intermittent stalling. does your scanner have the option of taking a movie so you can review the information?

we had one in a week or two ago unplug the maf it will default to map if its the problem the stalling will go away

I just wanted to let everyone know.... Fuel Pump was the problem. Because it always started right back up, I was not leaning toward it at first. However, in watching the fuel pressure gauge just as it was ready to stall, it dropped from 55 to 40 at stall, then jumped back up to 55. That is why it would start right back up. I put a fuel pump in it, upgraded the harness and it runs fine.

As I recall from the ones I did, the wiring harness seemed to be the issue and not the pump itself. However anything's possible nowadays, especially with ethanol fuel.

thanks for posting the fix

I have had many with these with the harness melting internally. Not saying that GM don't have an issue with the pumps, but anytime one comes in the first place I look is the connector on the crossmember.