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2002 Ram 5.9 gas multiple cylinder misfire?

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Old 02-11-2009, 09:25 PM
gypsyjon gypsyjon is offline
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Angry 2002 Ram 5.9 gas multiple cylinder misfire?

Hi I have a 2002 Ram 1500 quad cab 4x4 with a 5.9L gas engine with 133,000 miles on it. The problem started with a check engine light. I currently have it a local repair shop and they are having a tuff time getting to the heart of the problem. It started with a #5 cylinder misfire, just when they think they have the answer a different cylinder comes up with the same problem. They thought they found the problem when they found a shorted wire on a O2 sensor, but no luck. They plugs, wires, cap and rotor have all been replaced. Have any of you had a similar problem and if so what was your answer to the problem. Thanks.
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Old 02-12-2009, 09:24 AM
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PartsChaser PartsChaser is offline
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Hey, welcome to the forum. Normally I am in the 2nd Gen forum, as I have a 97 RAM with the 5.9, but I have had your exact problems.

When it was in the process of setting that check engine light, did you notice any power loss? Like it would only rev to 3000 RPM maybe? Mine had about 185k on it when it did the same thing, #5 misfire, then it went to multiple cylinder misfires, etc.

Long story short, it could be a few different things, but maybe this will help speed up the search:

1. Clogged Catalytic converter(s). When mine clogged up, basically breaking the guts loose, then re-welding them together with the exhaust heat it clogged up the exhaust, making it impossible to flow any exhaust gasses through, and causing the misfire (resolution - replace cat)

2. Bent valve on #5. This is how mine started, and it took a complete teardown to fully diagnose it, but I had a bent exhaust valve on that cylinder, new set of heads cured it.

3. Might be some easy stuff like a plug wire, cap/rotor/plug thats easy to replace.

If you havent checked on these already, might send that info on to your repair guys.

Good luck!
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Old 02-12-2009, 09:56 AM
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Have they done a compression test yet?
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Old 02-17-2009, 08:45 PM
gypsyjon gypsyjon is offline
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Thanks for the help! I am getting the Cat checked out this week. I am hoping that a simple cat replacement will fix the problem. The guy at the exhaust shop doesnt believe it is the problem so we will find out soon.
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Old 02-17-2009, 08:57 PM
dazed01 dazed01 is offline
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IIRC there was a tsb for plug wire routing. If you don't route the wires right it will cause misfire codes.
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Old 02-17-2009, 08:57 PM
 
 
 
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