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Anonymous Posted on Jul 22, 2017
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2004 GMC Duramax. engine surges mostly at idle, I think it does it at high speeds but not as noticeable; sometimes when I shut it off it won't start next time, I have to use the manual fuel pump under hood. Last night would not restart after attempting to use pump several times. I just has water pump replaced but it was doing it before. Any suggestions? Could it be fuel pump regulator?

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Anonymous

  • 2 Answers
  • Posted on Nov 29, 2008

SOURCE: 2000 GMC Jimmy will not start

The oil presure switch does have some bearing on the problem but my suggestion is to change the coil. I had a the same problem with an astro van. I changed everything that you have described and it fixed the problem just for a little while and then all of a sudden did it again. I changed the coild and the cold start swithch and never had the problem again.

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Anonymous

  • 56 Answers
  • Posted on Jan 05, 2009

SOURCE: 2003 GMC Duramax Diesel won't start

I see that you had the injectors replaced 20,000 miles ago. I would still check the oil to make sure it is not overfull. The new injectors could be bad. If the oil level is not overfull then get a paper towel and touch the dip stick tip on the paper towel while oil is on the dip stick. If it's only oil it will not spread. If it has diesel in the oil the oil with spread. If this test doesn't show the injectors to be bad then you have three other possibilities. The FICM (fuel injection control module), the fuel pressure regulator, or the injection pump. It's hard to pinpoint what the problem is without running more tests and the only way to run those tests is with the computer the dealership has. Just so you know your injectors are still under warranty until 100,000 miles. Most likely you will have to take it to the dealership to get you truck fixed. I hope this helps you some.

Anonymous

  • 5 Answers
  • Posted on Mar 09, 2009

SOURCE: i have a 1994 gmc safari.It seems to have a smooth idle at times

Im not sure if you got it fixed yet! It could possibly be idle air control valve. But here some more suggestions! I had a 94 Safari van 4.3 liter I was working on for about three days and I finally figured out what was wrong with it. It would run fine for a couple minutes and as soon as I hit the gas and let off it would surge, but anyways I ended up changing the distributer, after the fuel pump and filter, mass air flow sensor, egr valve, idle air control valve, map sensor, and ignition module. So that might sove the problem if you were on the same track with it as I was. Hope this helps ya!

Danny Morton

  • 4 Answers
  • Posted on Jun 02, 2009

SOURCE: 98 GMC 4X4 won't start

replace throttle body injector

Anonymous

  • 1111 Answers
  • Posted on Aug 24, 2009

SOURCE: 1995 GMC Sierra 5.7 liter stalls and is hard

even though parts are new they also come with defects so it sounds as if when you turn the key you hear it working and other times not at all hmmm connections are tight ? could be faulty fuel pump or relay .

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