Question about 1989 GMC K1500

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88 GMC k 1500 5.7 L 4x4 pick-up. My engine light came on for a brief minute then went out one day never came on again, but my truck stalls out when warming up and when im driving down the road, then when i start it up it takes forever to start although it is turning over fine, could it be my throttle body injectors or what? I dont think and hope its not my fuel pump because i think if it was it just wouldnt start period...

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Have the fault codes read first using a scan tool with GM protocol installed ( not all scanners are capable of reading GM codes
there will be a code recorded
doubt if it will be a pump problem but it could be a pressure regulator problem or an EVAP system problem

Posted on Jul 14, 2017

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Posted on Jan 02, 2017

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mas66
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SOURCE: '88 chevy truck, no spray from injectors

Not sure on that model what controls the injector pulse, but most vehicles either use the signal from the crankshaft position sensor or a cam position sensor. You should use a LED testlight, (NOT A BULB TESTLIGHT!!) and backprobe the injector terminals (with the other lead of the testlight to ground) while cranking the engine over. If the light flashes on one of the terminals, then you are getting injector pulse, and the fault lies elsewhere. If not, then you will need to replace whatver sensor is used to provide engine position signal on that model. Also, check the wiring to that sensor. Some vehicles have problems with the crankshaft pulley harmonic balancer failing and damaging either the body of the crank position sensor or its wiring.

Posted on Nov 02, 2008

  • 373 Answers

SOURCE: Injectors not firing

sounds like the injector need scleaning or look at

Posted on Feb 07, 2009

jagjeffery
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SOURCE: throttle body injectors not fiering but there is fuel pressure

the injectors are fired thru the engine cotrol module but it gets its signal to fire from the pick-up located inside the distributor if you are loosing injector pulse only the ignition module is bad if you are also loosing spark when you loose injector pulse your pick up is causing the problem if you replace the pick-up i recomend you change the ignition module when doing so because they work together and you have to remove the distributor to change the pick-up

Posted on May 31, 2009

  • 118 Answers

SOURCE: Running rough and buzzing at throttle body injectors

Sounds like the engine has a vacuum leak at the throttle body area.

Posted on Jul 20, 2009

  • 532 Answers

SOURCE: vaccum hose diagram for 88 chevy truck

it may not be a vacumn leak from a line,check the throttle shaft for movement,for example,i had a 89 1 ton 350 and my throttle shaft was moving around a lot and in order to keep it from idling high,i had to kick the throttle pedal.But also check the idle air control valve,which is the round sensor on the side of the throttle body.

Posted on Sep 11, 2009

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