1998 GMC C1500 rough idle

Tiny
MAGOISI
  • MEMBER
  • 1998 GMC C1500
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?
Wednesday, September 8th, 2010 AT 10:43 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 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
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Thursday, September 9th, 2010 AT 12:42 PM

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