Question about 1993 GMC Sierra K1500

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Vechile turns off while driving

My vehicle (1998 GMC K1500 ) intermittently turns off while driving. This occurs at a variety of speeds. The engine quits as if you turned off the key, but only for a second or two. Sometimes the engine will restart if speed is sufficient and the transmission remains in gear (Automatic). Most of the time, I am required to put the transmission in Neutral (While continuing to roll down the road), crank the engine, put back into Drive and continue. The vehicle always re-cranks intermittently. The dash lights react as if the ignition was turned off, example - all the lights come on then go off when the system initializes such as the ABS light and Air Bag light. Battery and alternator and connections have been checked. The problem may occur once a week or 3 times in one day. This problem may not occur for 3 to 4 weeks.

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Does it happen to occur when you maybe hit a bump? It sounds so much like a previous car I worked on he hs so many keys on the ring that when he hit a bump the weight of all the keys pulled on the switch and shut it off the only other way to find this is start the truck and start to shake wiring harnesses under the dash and under the hood it sounds like a loose connection in the primary ignition circuit
Please rate this post if it is helpful to you and contact me at fixincars@yahoo.com if I can be of any further help in this matter

Posted on Aug 27, 2008

  • Randy Harkins
    Randy Harkins Aug 27, 2008

    Does this happen only on a fully warmed up engine? Ever happen cold before the car reaches normal operating temperature?

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