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No power when I go to pass

Tiny
DANIEL STOPKA
  • MEMBER
  • 1996 GMC C1500
  • 5.7L
  • V8
  • AUTOMATIC
  • 250,000 MILES
Idle engine seems to run fine, even driving seems okay at time engine stutters or drops out when trying to pass no power engine stumbles. Catalytic temperatures right is 341° front and 486° rr. Left is 397° front 515 rr. I cannot find anyone that has a vacuum gauge to test the engine is breathing.
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Saturday, February 18th, 2017 AT 10:56 AM

4 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuel pressure with a gauge auto parts rent it pressure should be 60-66 psi with key on. See link.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Saturday, February 18th, 2017 AT 11:04 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Hey DANIEL,

There can be many things that can cause this like a plugged fuel filter, but I am thinking it could be the mass air flow sensor that needs to be cleaned, also check the air filter and here are a few guide that can help you.

https://www.2carpros.com/articles/mass-air-flow-service

and

https://www.2carpros.com/articles/engine-has-low-power-output

Please run some tests and get back to us so we can continue helping you.

Best, Ken
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Monday, February 20th, 2017 AT 9:53 AM
Tiny
DANIEL STOPKA
  • MEMBER
  • 2 POSTS
Hey Ken sorry it has taken so long for me to get back with but time and money has slowed me down. So I cleanded the mass air flow sensor and replaced air cleaner I also replaced the fue filter that had rusty lines and took a lottle more work. Truck runs much better but still have a shutter in the engine at high R's I know it's in the engine because I can rev up the engine and feel it so I dont believe it's trans. I looked at harmonic balancer and it looks fine everything is flush on the front of it. I dont know if it could be engine mounts. But it runs alot better so far. Also going to give it a full tune up plugs wire cap and rotor ect. Just a heads up there is not service engine warning light or codes except for 02 sensor bank 2 senser 2
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Thursday, March 30th, 2017 AT 10:42 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
The full tune up should help it could be the spark plugs are misfiring at higher RPM's

Please let us know what happens.

Best, Ken
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Friday, March 31st, 2017 AT 12:22 PM

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