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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 ALLDATAdiy.com users over the course of many years.
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  Jim Grant's Tech Tips

90 Dodge Grand Caravan, Random Spitting & Sputtering
Q: I have a ‘90 Dodge Grand Caravan, with a 3.3L V6 in it with approximately150k. We have changed the fuel pump and fuel filter and are still having problems...Sometimes it will start and run fine and sometimes it will spit, sputter, cut out and backfire, especially when I'm going up a hill....Can you please help me with this problem?

A: First, I would suggest rechecking the fuel pressure. The reason for this? We’ve been seeing corrosion problems in the wiring to the fuel pump. The corrosion, which seem to be sensitive to temperature and bumps, can cause a reduction in electrical power to the fuel pump. This translates into reduced fuel pressure. The best way to approach this problem, if it cannot be duplicated in the shop bay, is to drive the vehicle with a fuel pressure gauge connected to allow you to monitor the fuel pressure when the problem is occurring. If fuel pressure doesn’t drop, like the engine does when it’s having its throwing its fit, then there are other problems.

 
     
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