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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

'93 Mitsubishi Eclipse, Forever Hard Starting

Q: First thing in the morning it takes forever to start my ‘93 Mitsubishi Eclipse. It turns over, but won't stay running. I have to keep cranking and cranking and finally it will stay running, it idles rough until after you've driven it for awhile. Someone told me it was the thing that heats the fuel to make it expand. What do you think and if you agree; what is that part called? Sheri Collier

A: The thing that makes the fuel expand? I don’t think so. A vehicle that starts hard when cold but runs good warm, makes me think of a sensor problem. When an engine is cold, additional fuel is needed to start the engine and to allow for good driveabilty while the engine warms up. In the old days this was called a choke. For today’s computerized vehicles it’s called a coolant temperature sensor. The job of this sensor is simple, it alters a voltage signal to the computer in relationship to the temperature of the coolant. These sensors can break/fail and in most cases result in a check engine light. The problem occurs when the sensor shifts its values, it goes out of calibration. This means the sensor is lying. The computer doesn’t know any better. The result is the incorrect amount of fuel to start and run the engine. Diagnosis is best done when the vehicle is cold. Your tech should have no problem proving if your computer thinks it’s in the tropics while there’s still ice on the pond.

 
     
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