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1995 GMC C1500 truck wont start

Tiny
SISNEYFAMILY
  • MEMBER
  • 1995 GMC C1500
  • V8
  • 4WD
  • AUTOMATIC
  • 131,000 MILES
My 95 gmc truck will not start without great labor in the morning. I put in a code reader and it came back with coolant temp switch or circut fault. I replaced the coolant temp switch but still have the same problem. It barely starts in the morning. After you finally get it started it runs all day no problem. But once you let it set over night, it does not want to start again in the morning. Thans for any help.
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Monday, May 26th, 2008 AT 12:23 PM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
This can also be caused by a bad PCV, Idle air control valve, EGR stuck open a bit...or a vacuum leak, Main culprit tho, could be the fuel pump, do a pressure leak down test on the pump, see how fast the pressure drops after the key is turned to off.
https://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm
Go here and checkout our video.
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Monday, May 26th, 2008 AT 1:08 PM

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