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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 Oldsmobile Regency 98, No Up-Shift Transmission

Q: I bought a ‘90 Oldsmobile Regency 98 really cheap because the transmission wouldn’t shift. So I changed the transmission with one from a junkyard and still the problem exists. What makes a transmission shift?

- Joe

A: Depending on what transmission your vehicle is equipped with it could be as simple as a throttle valve cable adjustment, vacuum modulator problem or the governor is binding. It could also be that the used transmission you installed was just as bad as the one you took out. Older transmissions such as the one in your vehicle have test ports. These ports allow for pressure gauges to be installed for diagnosis. The manufacturer provides allowable pressure specification for each mode of transmission operation. This allows for diagnosis of worn, sticking or leaking internal components. If there are external adjustments such as a cable for a throttle valve or a vacuum line for a modulator, be sure they are connected and working correctly. After that, you need to have a qualified transmission technician diagnose your problem. If you don’t want to visit a transmission shop you can practice changing the transmission until something works.

 
     
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