Engine doesnt' want to re-start

  • 1999 GMC SIERRA
  • 107,000 MILES
Truck starts fine when cold, difficult starting after it is turned off after it is warmed up. 1999 gmc sierra 4.8l engine. Bought the truck 2 months ago. Replaced plug wires, plugs tuned @ dealer. Runs great. Just trouble starting after it is warmed up.
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have the same problem?
Friday, October 28th, 2011 AT 9:15 PM

1 Reply

Hot or Cold-Do below

Next time it refuses to start don't wait for it to make up its mind-do below immediately to determine if its fuel or spark problem

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, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if okay-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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Monday, October 31st, 2011 AT 11:37 AM

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