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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

'97 Dodge Intrepid 3.5

Q: I keep getting a 14, 51, 55 code on my car. I have replaced the MAP sensor and the plug wires. If I reset the codes, it comes back on when the car idles. The codes say it is getting a correction, but does not tell me what to do. What should I do?

A: The computer code #14 is indicating that there is a problem with the Manifold Absolute Pressure (MAP) sensor. The MAP sensor is overdressed verbage for a sensor that measures engine vacuum and reports this information to the vehicle computer. Engine vacuum information is needed for fuel, spark, transmission, emission control operation and the list goes on. That is why in the automotive trade we call the MAP sensor a critical input. If the MAP sensor information is out of range it can cause the next computer code you reported #51. Computer code # 51 means the computer thinks the engine is not getting enough fuel. The computer program will try its best to correct for a problem. If the needed correction/adjustment is out of the range of the computer’s abilities the computer gets upset. In your case it looks as if the computer cannot adjust the fuel enough to satisfy the requirements of the program/software. To get the computer code that you’ve provided means you’ve used, “the turn the ignition switch off then on 3 times” trick to get the computer to flash the check engine light. The problem with this procedure is that you only have the information that the computer is up-set about. What you don’t have is the data to support that information. You need to use a computer scan tool to see the information that is getting the computer all bent out of shape. The code #55 means the computer is done reporting problems and will just start repeating the reasons it’s up-set about. It sounds as if you have a problem that is deeper than replacing a MAP sensor or some ignition components. It’s time to visit a shop that has some upper end diagnostic equipment.

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