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What makes my 98 GMC suburban crank fine with cold engine but not at all with a warm engine and a new starter did not correct the problem?
Wiki User
∙ 14y ago
Obviously your starter is NOT the problem. I also assume it starts fine when cold? I'd ask a few more questions to help diagnose the problem but here are a few places to begin.
Newer vehicles with electronic ignition have what is called a "start sequence." You need to find out where in the start sequence something isn't working when the vehicle is hot. Number one, pull the computer codes. If the vehicle is drivable, AutoZone can do it for you for free. Buy a Haynes Repair Manual when you are there. I found one to be very helpful in a similar situation with a different vehicle.
There is a relay called the "ASD" or automatic shut-down relay that is designed to shut off fuel, spark, etc. in the event of a roll-over. If the relay is bad, the vehicle will not start. I'm not sure if it will crank or not in this circumstance. Sometimes relays and sensors only have problems when hot.
If the vehicle runs when cold then quits after getting warm/hot, that can be one problem.
If the vehicle runs until you shut it off then will not restart until good and cold, it is likely one of the electronic ignition sensors. A few of the sensors are: coolant temp., crank position, and cam position sensors. If it isn't one of those sensors, it may be your ignition coil.
I hope something here helps.
Good luck.
Len
Wiki User
∙ 14y ago
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