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rpmdiag
rpmdiag, Tech and Instructor
Category: Car
Satisfied Customers: 6844
Experience:  Since 1975
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94 Olds: operating temp..freeway..The speedometer will spike..car back

Resolved Question:

My 94 Olds dies on me when reaches operating temp. This can be driving in my neighborhood or even on the freeway. The speedometer will spike then the car dies, I can start the car back up again right away, most of the time I have to pull over to do that. I've replaced all vacuum hose's, The ignition module, spark plugs, retighten all cables, even put on new gas cap. Nothing helps. Please help me, Jim
Submitted: 7 years ago.
Category: Car
Expert:  rpmdiag replied 7 years ago.

HiCustomer

 

Test the CRANK sensor with a scope, this can be tough, but it can be done by watching the signal while driving the car when this happens. Then take a snap shot of the waveform. It's not hard to do either. Here's a pic of how it should look if it's good.

 

Thanks for your question,

 

Ron

 

graphic

Customer: replied 7 years ago.
so what does this sensor senses and if this is my problem why does my car dies or shuts off
Expert:  rpmdiag replied 7 years ago.

Crank shaft position signal for #1 cylinder to the computer. When the sensor wears out, it can no longer withstand the heat that it's subjected to and does exactly what your symptom is.

 

Thanks again,

 

Ron

Customer: replied 7 years ago.
how exspensive of a repair is it to have that replaced.
Expert:  rpmdiag replied 7 years ago.

Under $100.00 should do it for part and labor

 

Thanks again for your SUPPORT,

 

Ron

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