Mechanics

MODELS HARD START WHEN WARM

1999 GMC Other

Other Category problem
1999 Other GMC Models V8 Four Wheel Drive Automatic 140000 miles

Starts right away when cold. Cranks for several seconds when warm. Back fires every couple of weeks.
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Aman721
February 3, 2008.




The fuel pressure regulator may be your problem if it is leaking. Sometimes there will be a raw fuel scent at the motor when this happens. The 5.3 motors were affected by this.



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