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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 Plymouth Sundance, Bad Gas Mileage
Q: I really enjoy your tech tips column - it's addicting to read. I just bought a '90 Plymouth Sundance which runs perfectly (engine very smooth with plenty of power) but only gets 20 mpg. It has a 4 cyl - 2.5 litre engine with 3 speed automatic. If the O2 sensor fails to generate its 1 volt signal, could it cause a rich fuel mixture - without affecting driveability?

A: An O2 sensor can fail in a manner that will cause poor gas mileage. But, before installing any new parts I suggest checking the basics. It's not uncommon for the vacuum hose to the Manifold Absolute Pressure (MAP) sensor to crack, collapse or become restricted. MAP is a fancy name for an electronic vacuum gauge that the vehicle's computer can read. The vehicle's computer makes fuel delivery adjustments based on the information it receives from the MAP sensor. The computer is completely clueless that the information it's received is incorrect. The result can be increased fuel consumption with no noticeable driveabilty problems. It's important to be sure the basics are correct before replacing any pricey computer parts. You can waste a lot of money guessing.

 
     
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