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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

'92 Dodge Dakota, Stalling Problems

Q: My friend's ’92 Dodge Dakota pickup truck has been into the shop a number of times this year for an intermittent stalling problem. Cold, hot, long distance, short distance, stopped and driving, the truck has stalled under all circumstances. The mechanic replaced the fuel pump, checked all potential problems and is now on the second black box. The stalling has stopped, but the vehicle idles rough and shakes both stopped and driving. The mechanic has ordered yet another black box. He says #7 injector is a problem. First time, it was another injector. Any thoughts?

- Joanne R.

A: I’m not sold on the need of another black box (computer) and I also wonder about the injector problem. The use of a lab scope with an amp probe can pretty much prove if the injector is a problem or if something else is going on. You should also be aware of an internal vacuum leak that is common to Chrysler’s V-6 and V-8 engines used in their pick-up trucks. There is a pan/cover bolted to the bottom of the intake manifold on these engines. The gasket that seals this cover can fail and cause an internal vacuum leak to the engine crankcase. The failure of the gasket is common to the rear part of the intake manifold. Depending on the level of gasket failure the engine could just have an unsteady idle to having one or more cylinders misfiring. Because the gasket failure is often to the rear, the cylinders affected are often the ones in that area; back of the engine. I suggest removing the air cleaner assembly, with the engine off, open the throttle plates and look down into the intake. If you see oil on the bottom of the intake then diagnosis should be directed to the gasket failure described.

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