Stalling 1990 GMC 1500 5.7

CHAD CAWLEY

MEMBER
1990 GMC C1500
V8
2WD
AUTOMATIC
180,000 MILES

I was driving my 1990 gmc sierra 5.7 v8 when it just started to sputter and back fire a couple times I was not able to increases speed while this was going on for about three miles when I got to my destination the tuck was running really rough then stalled. I smelled a rich oder of fuel. I had a tune up about a 1,500 miles ago fuel filter new fuel pump and modular cap and roter the tuck turns over but now will not start the truck has about 180,000 miles without a rebuild

Sunday, December 5th, 2010 AT 3:53 AM

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Do below:

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine at least 3/16 away from ground -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if so, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it

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Sunday, December 5th, 2010 AT 8:07 AM