Question about 1998 GMC Sierra

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Engine starts then dies

When starting, if you keep pumping the pedal it will stay running and after it warms up, it runs fine. It has throttle body injection. I have replaced the inlet air sensor and tested the TPsensor, which works fine. I get no check engine light, but have not tried an OBD1 tester yet to see if it may still have a code, even with no engine light.

It is a 1994 350 chevy 2 wheel drive ext cab Silverado. It seems to get plenty of fuel when running by looking at the injectors.

What typically happens is we try to start it, and after pumping the gas pedal to keep it running, and then if you let off, it dies, but if you try it a bit later, it runs fine from getting warmed up or residual warmth from the failed starts. It will run all day once started.

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Probably MAF. Mass air flow sensor, or idle control system/ sensor.
I have actually heard of some people having this problem because of a faulty heat sending unit, which doesn't show up on scan, but i'm still betting on the MAF. Good luck, let me know what you find.

Posted on Jun 22, 2009

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  • Master
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Have to think with all the testing you've done, that the issue is fuel pressure regulator or the fuel pump. Since the problem seems to be lack of fuel when starting, i'd start at the fuel pressure regulator since it's the easier of the two to check. Best of luck.
Greg

http://www.chiltonlibrary.com/content/images/9111/images/91115p04.pdf

Posted on Jun 22, 2009

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