2002 Dodge Caravan Fuel Injector Problem

JHAGELBERGER

MEMBER
2002 DODGE CARAVAN
6 CYL
2WD
AUTOMATIC
11,800 MILES

2002 Dodge Grand Caravan 3.3L with 118,000 miles. Problems lies when it rains over night and the van sits outdoors, when I use the van in the morning after the van warms up (probably 10-12 miles of driving) the van starts misfiring and dumping fuel. This only happens after a heavy rain. What I've done in an attempt to fix problem. The plugs, wires and igintion coil have all been replaced, engine code said injector 6 was faulty, replaced fuel injector 6, still haven't fixed the problem. Could this be computer related. Again van runs great when weather conditions are normal out.

Any suggestions?

6 Replies

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Something is getting wet and shorting out. What I need you to try is this. On the weekend, when you don't need the car the next day, wait until night. Open the hood, start the engine, and using a spray bottle, spray around the computer, injectors. To see if there is any arcing. In the dark it is easier to see.

It sound primitive, but it works.

Let me know what you find.

Joe

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Thursday, August 19th, 2010 AT 10:26 PM

JHAGELBERGER

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3 POSTS

Joe,

Thanks for getting back to me. I did spray around injectors and plugs. Could not see anything arcing? I found a used PCM (hopefully it will match my PCM) at a scrap yard. Picking it up today and having it flashed. Hoping this fixes the problem. There seems to be a lot of battery corresion near the PCM. Here's to hoping! Can you think of anything else that may cause the problem. Running rough at all times now even during good weather.I am thinking the PCM is just telling the engine to dump fuel.

Can it be a cam sensor? Or a bad wiring harness?

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Thursday, August 26th, 2010 AT 9:30 AM

JACOBANDNICKOLAS

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109,755 POSTS

Make sure that isn't the problem. If you have corrosion, it could be the problem. IF you got a different PCM, it has to have the same part number.

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Thursday, August 26th, 2010 AT 9:51 AM

JHAGELBERGER

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Thank Joe, yes I will make sure the PCM's match up, although I did talk to a Dodge service tech and he said as long as your van doesn't have a theft system or a century chip you can put in a PCM as long as it matches up to your engine, no flex fuel, same emissions and has an EGR as my does. Would you agree with that?

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Thursday, August 26th, 2010 AT 10:06 AM

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Yes, that is correct. When you have any of the items mentioned, that is when you run into having to reflash the computer to identify different sensors.

Let me know how it works out for you.

Joe