1997 GMC Sierra Hard Starting

1997 GMC SIERRA
129,000 MILES • 7.4L • V8 • 4WD • AUTOMATIC
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BIGCUTT
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  • 2 POSTS
While running and idling, everything is normal. All at once it became hard to start. I have to push on the throttle to get it started. When the motor is warmed up, it is even harder starting. Just changed plugs and fuel filter. Regular synthetic oil changes, excellent care and easy use. Very clean motor. Clean air filter, etc.
Aug 19, 2015 at 3:27 PM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
scan for codes and check fuel pressure with a gauge auto parts rent it. 56-62 psi
Aug 19, 2015 at 10:48 PM
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BIGCUTT
  • MEMBER
  • 2 POSTS
Thanks, I went to auto parts and asked them to scan. They said if it is not throwing any codes my check engine lights will not be on. There are no lights on while running I thought about fuel pressure, so I will do that. I did listen to the electric fuel pump by turning the key on and not starting the engine. The pump shut of in a few seconds, so I thought that it was hitting its pressure right away, but will test.
Aug 20, 2015 at 12:29 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
the only good test for a pump is by check pressure with a gauge and volume nothing else.
Aug 20, 2015 at 12:57 AM
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