1997 GMC Sierra Engine will turn over but wont start

Tiny
SAMB7233
  • MEMBER
  • 1997 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 120,000 MILES
A few days ago I went to start my pickup but all it did was crank. I puled a plug to check for spark, inspected the cap and rotor, and made sure my battery was at a full charge. It is still a no go. When I turn the key the engine cranks until it seems like it is just about to start then the engine pauses and starts cranking again. Am I right in guessing that my fuel pump, while stil pumping, is not hitting the required 56 PSI to operate the injectors and it is time to replace the pump?

I have the kit to test the line pressure but for some reason I cant see the schrader valve on the fuel line. I know it is on the fuel line near the back of the block but I must be blind because I cant find it.
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Thursday, January 10th, 2008 AT 4:26 AM

2 Replies

Tiny
RASMATAZ
  • MEMBER
I puled a plug to check for spark, inspected the cap and rotor, well does it have spark and its a snapping blue spark bcuz if its orange looking the ignition system is weak

When was it last major tune-up
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Thursday, January 10th, 2008 AT 4:35 AM
Tiny
SAMB7233
  • MEMBER
It was a snapping blue spark. Last major tune up was about two months back. They did say that my fuel pump was getting very loud.

Edit: I checked the fuel line pressure and it is hitting 60 PSI so it is well within the range to start the engine. Could there be a problem with the Mass Airflow Sensor?
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Thursday, January 10th, 2008 AT 1:41 PM

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