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Repair guides and support for C/K pickup trucks sold by General Motors under the GMC brand, including the GMC Sierra.

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Almost stalls when started

My 1997 Yukon with a 5.7 Vortec has issues again. Just replaced fuel pump and filter. Couple weeks later and now every time I try to start it it hesitates and sounds like it just barely starts. Like it will stall out. Sometimes need a couple tries on the starter. Then really low rpms for a couple seconds. The. It runs as normal. When it used to start after 1-2 seconds of starter engagement it would fire right up. Seems to have a slight loss of power on hills and idles slightly rough, but not very noticeable. These issues were both present before the hard to start issue. From what I have read it could be 1)bad egr valve 2)leaking or stuck injectors, 3)bad fuel pressure regulator. I just went out and picked up a fuel pressure tester. So u will check pressure, turn off key and see if the pressure drops. This should tell me if injectors are bad. I think? I heard to pull a vacuum line off the fuel pressure regulator and if it leaks gas while running or shut off then I know the regulater is bad. I think? Egr valve I just takeoff and check for proper operation. Watched a YouTube vid on that. Does all what I said sound like correct diagnostic procedure? Any help, advice, guidance is greatly appreciated. Last month I've done starter, fuel pump and filter and a u joint. Ran it for the last year with no problems whatsoever.

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1 Antwort

Don't forget to inspect the "new" fuel pump.

If the Fuel pump is in located in the fuel tank, as uses the fuel to keep the pump cool. These pump tend to be very problematic. If you run the tank below one quarter of full, it might damage the pump. This is the same symptoms ours had when we had driven with the fuel level below a quarter tank. From what i understand it doesn't take long to ruin the unit. Hesitation and stalling is the result. We've gone through three of these at $900 each to replace at dealer.

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BigYuke wird auf ewig dankbar sein.
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