1998 GMC C1500 rough idle

1998 GMC C1500
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MAGOISI
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  • 2 POSTS
Engine Performance problem
1998 GMC C1500 V8 Two Wheel Drive Automatic

I was waiting for one of my kids from school and was in park. The truck started to idel a little rough then just died. The relay has been changed and it still does not start...It turns but nothing?
Sep 8, 2010 at 10:43 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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RASMATAZ
  • CAR REPAIR CONTRIBUTOR
  • 75,992 POSTS
Do below

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 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, 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,cap and rotor,distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing
Sep 9, 2010 at 12:42 PM
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