1989 Chevrolet Truck Engine Hesitation

Tiny
CFHIV
  • MEMBER
  • 1989 CHEVROLET TRUCK
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
My engine cranks long before igniting when cold and hesitates or stumbles during acceleration. I have changed the fuel filter. I have been told by a friend to look at the MAP sensor and throttle position sensor. I don't know what to do before spending money. I would like to do a fuel pressure test but I can't find an illustration showing me where to do it. I am having trouble troubleshooting this. It has stalled twice after a hot start up.
Saturday, June 28th, 2014 AT 3:55 PM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Fuel pressure you need an adapter to do it autoparts rent the gauge but may or may not have adapters. Yours shold be 9-11 psi. But check vacuum hose leading to map, and check base of tbi unit for a blown gasket that is a common problem. Squirt choke cleaner around it if it smooths out you found it. If check engine light is on scan for codes.
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Saturday, June 28th, 2014 AT 4:09 PM
Tiny
CFHIV
  • MEMBER
  • 2 POSTS
Ok, thank you, but where do I attach the gauge to check fuel pressure? I don't have a schrader valve.
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Saturday, June 28th, 2014 AT 4:22 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
That is what the adapter is for you unscrew fuel line then screw adapter into it or however it hooks up
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Saturday, June 28th, 2014 AT 4:30 PM

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