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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
If you have any questions, please feel free to email us.
 
 

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  Jim Grant's Tech Tips

'90 Geo Tracker, Surging Problems

Q: I have a ‘90 Geo Tracker. The car surges when running. In other words when you are driving with your foot on the gas pedal in the same position the car will rev up and down. I have no idea why this is happening. Initially I thought it was the fuel filter and changed it. That did not solve the problem. Is it possible that there is a vacuum problem or something that I am missing?

A: I had an Oldsmobile show up at the shop that if you held the throttle steady at highway speed is would slow down and then speed up every 16 seconds like a clock. What was the cause? It turned out that the oxygen sensor for the computer was lazy (slow in responding). The lazy sensor would cause the vehicle’s computer to slowly change the fuel delivery from too much to too little about every 16 seconds. The vehicle would speed up and then just start slowing down. The cycle would just continue if you held the gas pedal steady. The strange thing was the lazy sensor would test great with all diagnostic procedures in the shop bay. It wasn’t till you were driving on the highway that the problem would occur. I’d be looking at the oxygen sensor as a possible cause.

 
     
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