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97 Yukon almost dies when started.

BigYuke

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BigYuke New Member

BigYuke

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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. Then 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 leaking. 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. Ran a week or two after fuel pum without starting issues. Tonight it started after 3 tries. But I'm 300 Kms from home and thinking of letting it run all night because I don't wanna get stranded so far from home. Please help.

  • 2 weeks later...
Lazarus Long Enthusiast

Lazarus Long

Posted
Posted

Interesting, I am having minor issues with my 1997 Tahoe.

 

I had to replace the fuel pump this summer, and ever since it doesn't fire up instantly like it used to.

It will start, then die and I have to start it a 2nd time to get it running. Once it is running it is fine.

 

As an experiment, I tried turning the key and paused for a few seconds, which I think gets the pump running. Then I cranked it. It fired right up like it used to. Makes me think the fuel pump isn't starting up like it should be.

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