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Old October 7th, 2010, 07:12 AM   #1
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Default Dodge Ram misfire at idle ok elevated RPM 5.9L

Hello all,
I recently purchased a 1997 Dodge Ram w/ 5.9L V8 that has 220,000 miles. The truck runs great while driving and has plenty of power. Doesn't appear to burn or leak any fluids. The problem I have is a misfire at idle only. It is flagging misfire codes for cylinders 1 and 2 and you can feel the misfire at idle but goes away at approximately 1000 RPM or greater. The plugs, wires, cap, rotor prove out ok. I ran some sea foam injector cleaner through it and it feels like it improved it a little bit but hard to tell. I'm just looking for ideas. I've thought about replacing those two injectors in case it was a bad spray pattern. The other thought I had was possibly a valve sealing concern. I haven't had a chance to check manual compression and cylinder leakdown yet. The other thought was a head gasket as it being with two companion cylinders but with no evidence of a coolant loss and no odor from the exhaust makes that one hard to believe.
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Old October 7th, 2010, 11:53 AM   #2
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Just a question but how did you check the cap,wires and rotor? it sounds like the plug is not firing. you mentioned #1 and #2 cylinders are missfiring. if thats true thoes are not compainon cylinders because they are on different banks. I think you mean #1 and #3 cylinder. Have you swapped plugs and wires with other cylinders? I would do that before you replace injectors. And on that note, you could switch your injector location and see if the miss follows the old injector.

Have you looked in to the EGR valve? If that is not closing properly it will cause idle issues, but "dissapear" above idle.

it could be a compression issue, but you could pull the PVC and see if its breathing heavy/ have a lot of blow by. if you do the compression test, puta couple squirts oil down the cylinder to see if it seals.

good luck
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