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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

'92 Mazda 929, High Idle

Q: I have a ‘92 Mazda 929 and it’s idling way over 2000 RPM. I also have a check engine light, on what can I do about this problem?

A: My suggestion? Start first with the check engine light. My reasoning? When the check engine light is on in a Mazda of your vintage there has to be a system problem. The early On Board Diagnostic (OBD I) systems were really on the loose side of acceptable tolerances, simply meaning that something has to be really broken before the check engine light is turned on. The same computer that turns the check engine light on performs the idle control on your Mazda as well. So, if the computer is upset about something and the idle speed is out of control it is likely the diagnostic trouble code from the computer will provide a solution to the high idle. Have a technician ask the computer what it is complaining about and you just may have the answer to the other problem.

 
     
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