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1999 GMC Sierra Hard Starting

Tiny
VSCHULZE
  • MEMBER
  • 1999 GMC SIERRA
  • V8
  • 2WD
  • AUTOMATIC
  • 75,000 MILES
The engine starts immediately when cold but when warm it has to crank for several seconds before starting. There are no error codes showing up on the OBD. What to look at first?
Wednesday, January 30th, 2008 AT 10:51 AM

5 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Need to know which engine your truck has. The 8th digit of the VIN#. Have you had the fuel pressure checked with a manual gauge? Could be a bad fuel pressure regulator.
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Thursday, January 31st, 2008 AT 8:03 AM
Tiny
VSCHULZE
  • MEMBER
  • 4 POSTS
The eighth digit is a T which indicates the 5.3L engine. No, I have not checked fuel pressure yet, I wanted to get some input on where to start first instead of just randomly checking things.
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Thursday, January 31st, 2008 AT 10:03 AM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Start there. Located drivers side on the fuel rail with a vacuum line going to intake. Remove line at reg and look for fuel, if any is present in the line, replace the regulator
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Thursday, January 31st, 2008 AT 11:25 AM
Tiny
VSCHULZE
  • MEMBER
  • 4 POSTS
That was the problem. Fuel was in the vacuum line.
Replaced the pressure regulator and all is normal.
Thanks for your assistance
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Sunday, February 3rd, 2008 AT 6:41 PM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Youre welcome
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Monday, February 4th, 2008 AT 7:15 AM

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