Ok...this has been a reoccuring problem for little over a year now. It first happened in July 2002, again in June of this year and yet again this past weekend.
In all instances the Suburban was driven over 100 miles the day before and then allowed to sit outside overnight. In the morning the Suburban starts instantly, but then cuts-out and dies immediately after start-up.
This start-up then die sequence will happen for almost exactly two hours before the truck will finally start and run fine.
I have replaced the oil pressure switch as someone has suggested recently. As the key is turned you can hear the fuel pump run and see oil pressure guage move. But, just after the engine starts it dies...it does not stall as if from a plugged fuel filter, injector, etc.
Is there any computer input, sensor or signal that would shut down an engine right after it has started? It seems to me that a sensor has become damp from either weather or condensation and the signal from this sensor is required to allow the engine to run once started. The engine starts instantly and strong...there is no hesitation on the start...it just doesn't want to run.
When the truck finally runs, it starts and runs perfectly for months on end. Like I said it tends to do this after a long trip where the truck then sits overnight outdoors.
Any thoughts? Would the Helm shop manual be a good place to start diagnosing this type of problem?
Thanks!
Mike S. Kalamazoo, MI