Question about 1989 GMC K1500
Truck runs when cold,but stalls when you give it gas after it warms up.it will start backup when you hold gas peddle to the floor then it sounds like it was flooded.it is throttle body 350 ci,automatic 4x4.it has 160,000.it ran good this fall but ran like **** after it sat for a couple months.i tried dry gas but no difference.cat converter was suggested but has good flow .but maybe it is clogging up when warms up.also suggested was temp sender to the computer,sending wrong info for warm fuel mixtures. I've got a 1989 GMC 1500 with 5.7 EFI will start when cold warm up and die. If you hold the pedal to the floor it will start back up and die. then won't start back up for several hours. changed cap & rotor, fuel pump relay, and Ignition modual.
I agree .. change the fuel filter and check the pump sounds like your issue. But there also could be a vaccum leak so listen for air sounds and hunt it down. That can cause it to stall and run crappy. Also have the throttle body injection area cleaned with the throttle body spray and a brush with vehicle off.
Posted on May 24, 2014
Have you chg. fuel filter? If so, best to do a fuel pressure test, sometimes( not always) when the pump gets warmed up they can loose a little pressure and thats all it takes just a few # under recamended p.s.i and the truck quits running, you may hear the pump run but its not putting out the correct pressure until it cools down and it starts working again, but after a while quit all together.
Posted on May 27, 2009
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Posted on Jan 02, 2017
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