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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

94 Lincoln Town Car, Check Engine Light on Again

Q:
I have a '94 Lincoln Town Car. The "Check Engine Light" comes on. The car was diagnosed as needing an EGR valve. The valve was replaced but the "Check Engine Light" still comes back on. Is it a possible faulty switch?....Linda

A: Was the EGR valve replaced because the computer had a code for the EGR system? Or, was it diagnosed "proving" that the EGR valve was needed? There are several components, some related and some not, to the EGR system that can cause the vehicle's computer to turn on the "Check Engine Light" and set a code for the EGR system. Basing repairs (replacing parts) on a code provided by a vehicle's computer and not by diagnosis often leads one right back where they started. The only way you will know is to ask the vehicle's computer why the "Check Engine Light" is on again.

 
     
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