Question about 1991 GMC Sierra

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Describe your trouble shooting 91 gmc truck Problem Truck will start it won't idle you have to pump gas pedal to keep it running but it is fluttering the whole time. unhooked vac line to map sensor it will idle some then. Have replaced map sensor and fuel filter still have the problem.

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Test fuel pressure by renting a fuel pressure test kit from schucks or auto zone then turn key on then off if it hits 50 psi it's ok if it drops below 20 psi in one minuter then fuel pump is bad. if it has throttle body injection then replace the injector or pull it apart to see if it is plugged.check oil pressuer switch behind the distributor to see if it is bad it will cause it not to run if defective.

Posted on Jul 18, 2009

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