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Old 03-03-2009, 01:19 PM   #1
osuyaqui
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Angry 02 Dakota Multiple/ Random Misfire, Cylinders 2,4,5,6

I have an 02 Dakota with a 3.9 V6 and over the last four months I have been getting Multiple/ Random Misfire codes coming up with the following cylinders as being the issue 2,4,5, and 6. The truck will start up fine and shortly after it will start to idle ruff. If I allow the truck to warm up for about 15-20 mins it will straighten itself out. If I try to drive before it is warmed up the engine will bog down and back fire. As the weather gets colder it seem to increas in intinsity. I have already done a tune up ( i.e. plugs, wires, cap, rotor), replaced two fuel injectors, and done a fuel system cleaning ( i.e. injectors, fuel line, carb). I am thinking about replacing either the Abient Air Temperature Sensor, Idle Air Control Valve, MAP, or Throttle Position Sensor. Can someone help get me headed in possible the right direction?
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Old 03-03-2009, 11:22 PM   #2
hundahunta
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Re: 02 Dakota Multiple/ Random Misfire, Cylinders 2,4,5,6

what was the compression, do you seem to be burning oil,
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Old 03-04-2009, 07:50 AM   #3
osuyaqui
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Re: 02 Dakota Multiple/ Random Misfire, Cylinders 2,4,5,6

I have taken my truck to two different shops and the dealer ship. All of the wires and fuel are at right pressure. I had the engine checked for vacum leaks and there were none. Everytime I have taken the truck into the shop they all call me the next day and tell me they can't find anything wrong. That is why I am thinking I might have a short in one of my sensors changing up the fuel air mixtures which is causing me to have the back fires.
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Old 04-09-2009, 09:49 AM   #4
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Re: 02 Dakota Multiple/ Random Misfire, Cylinders 2,4,5,6

sorry for the late response,if you havent already repaired your problem;try taking the exhaust down by unbolting at the flange before the converter. It will be a little noisy without cat and muffler but run the truck from a cold start and see if it makes a difference in the idle and misfire condition. You may have an exhaust restriction that is temperature sensative and improves with warm-up, and also will send random misfire codes as a result. Hard to say for sure without looking at it but this is a commonly overlooked problem even at shops..good luck
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