1999 GMC Suburban starting

1999 GMC SUBURBAN
110,000 MILES • V8 • 4WD • AUTOMATIC
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BIG DUTCHMEN
  • MEMBER
  • 3 POSTS
Our surburban, sometimes doesn't start when you shut off for a short period of time, 15-30 minutes. If we let it set for 30 minutes and then it starts. It has been doing this for more that 3 years, but it happening more often now. Every time I call some one, by the time they get there it starts
Thanks
Oct 9, 2009 at 10:17 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Next time it happens don't wait-do below to determine if its fuel or spark problem

Disconnect a sparkplug wire or 2 and ground it to the engine -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, ECM,Ignitor camshaft and crankshaft sensors- Note: If it doesn't apply disregard it
Oct 9, 2009 at 11:06 AM
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