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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 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

Ď87 Nissan Pulsar, Idle Problems
Q: I have an Ď87 Nissan Pulsar. The carís idle is very rough, so I brought it to a Nissan dealer. They had it all day and couldnít find anything wrong with it, but the trouble was still there. Sometimes it runs good and then it gets rough again with some black smoke coming out the exhaust. I took it to another mechanic and he said that it needed a TPS sensor. He replaced it and it was all right for a while but then the idling problem returned. I brought it back to him and he replaced the fuel filter. Once again, it ran okay for a while but we are right back to the rough idle.

A: The black smoke out the exhaust would be a good indicator that the engine is receiving too much fuel. To truly determine if the engine is receiving too much fuel the exhaust can be sampled with an exhaust analyzer or by checking the voltage values of the oxygen sensor that is mounted in the exhaust. The vehicleís computer uses information from the oxygen sensor to aid in adjusting fuel delivery. The same information can be used by a technician to determine if the engine is getting too much fuel. Iíve seen problems with fuel injectors in vehicles like yours. It isnít that the injectors are not working, itís that they donít close tight allowing extra fuel to enter the engine. This is most noticeable at idle speeds and will cause black smoke out the exhaust. The proper equipment and diagnostic procedure will pin down the cause for your problem.

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