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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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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 users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

'98 Dodge Intrepid, No Start When Hot

Q: My ‘98 Dodge Intrepid has 120k and I have replaced the EGR, A.I.S. motor, M.A.P. sensor battery terminals and all the other sensors on the intake plenum have been cleaned. When I drive the car for about 50 miles shut it off and go out to start it 15-60 minutes later it will start and stall, run rough and die. I can start it and put it in gear fast enough and tickle the gas and some times I can drive away. The fuel pump, filters, injectors were done at 65,000 miles. When I did the EGR I took off the intake plenum and cleaned the carbon out of that also. Everything has been done to torque specs. No engine lights stay on, temp gauge is normal and idle is at 550 in drive when hot. One dealership suggested that a heat sensor was causing the problem. What do you think?

- Jim M.

A: I think you’re having a fuel pressure problem. But it is going to take a little proving to answer that question. If fuel pressure is too low it will cause air to form in the fuel injection system. This condition is compounded when the engine is hot. If you play the throttle just right you can keep the engine running (as rough as it may be) long enough to purge the air from the injection system. Once the air is gone the engine runs smooth again. The reason I do not believe that the condition is being caused by a heat sensor? Does your engine ever run as bad when it is running and hot already? If a sensor was failing or lying because of heat you would notice the condition while the vehicle is running. To prove this would require installing a computer scan tool and monitoring the different sensors. Just call the repair facility that you do business with and schedule your vehicle for the return trip of a 50 mile drive. Just 15 to 30 minutes with some diagnostic equipment at the right time could answer a lot of questions.

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