1997 GMC Sierra Hard cold start

Tiny
DENNIS_MAINE
  • MEMBER
  • 1997 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 141,000 MILES
Hard/no start after cold soak. Starts with ether or carb cleaner. Runs fine, will start fine after initial start. Replaced fuel pressure reg and fuel filter on advice from another web site. No improvement. Fuel pressure before starting is 55-59 lbs. I think it is the fuel pump (even though I replaced it 3 years ago for another issue) but am hoping I don't have to do it again. Do I?
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Saturday, February 13th, 2010 AT 8:04 PM

8 Replies

Tiny
HMAC300
  • EXPERT
With 55 lbs pressure it should n't be a fuel pump but. Before you start it check to see if you have fuel pressure by taking the cap off and just pressing on the schrader valve. It may be losing pressure after it sits for a while. There was a problem with those fuel pumps and if you get a delco they supply you with the harness that needs to be replaced at the same time. It's about 12" long that went bad.
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Monday, February 15th, 2010 AT 6:38 PM
Tiny
DENNIS_MAINE
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Also noticed a lot of chatter about the poppet valves on this model year. Could stuck poppet valves require a higher than normal fuel pressure to overcome when cold?
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Wednesday, February 17th, 2010 AT 6:28 PM
Tiny
HMAC300
  • EXPERT
If you are talking about the egr valve, it would make it run rough not start. But you can clean them sometimes and get away with it. But one thing I did forget was the cannister purge valve. IF that is stuck open it may not idle at all and effect cold starts. It is only supposed to open at 30 mph and above. And easy test for it is to block the line going to the tintake with a screw or bolt. If the other ting I said don't work. The only other thing I could think of woul d be the sensor in teh distributor giving your problems. You should be able to test that with an ohm meter though.
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Wednesday, February 17th, 2010 AT 8:16 PM
Tiny
DENNIS_MAINE
  • MEMBER
No, I was talking about the valves at the ends of the fuel distribution tubes under the upper intake manifold. I heard they can cause problems after a lot of miles. The truck idles and runs excellent; it just won't start first thing in the morning without ether. After that, it's fine the rest of the day.
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Thursday, February 18th, 2010 AT 8:56 AM
Tiny
HMAC300
  • EXPERT
See whathappens when you retire? Lol. Ya the poppet valves and lines will give you trouble as they had a tendency to break/crack the lines and would effect the spraying into the cylinder. I don't rmemeber how exspensive they are though.
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Thursday, February 18th, 2010 AT 10:25 AM
Tiny
DENNIS_MAINE
  • MEMBER
Well, I guess I'm about to find out just how expensive they are.
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Thursday, February 18th, 2010 AT 10:52 AM
Tiny
HMAC300
  • EXPERT
You do know that it could be the main injector that feeds them as well. I'd take it to a pro to havehim check it out to make sure it's the problem.
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Thursday, February 18th, 2010 AT 6:30 PM
Tiny
DENNIS_MAINE
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Yes, I'll do that. And thanks for all your help and input; I really appreciate it.
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Friday, February 19th, 2010 AT 8:54 AM

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