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  #1  
Old 01-31-2011, 02:58 PM
jcsmonkay jcsmonkay is offline
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Default Misfiring Problem

Hey guys, this is my first post, so I'm not sure if this belongs here but, here it goes:

I have a 94 Ram 2500 5.9L that's having big misfiring issues that started yesterday.

Truck started running rough on the way to the bank, then started shaking like a rocket at take off and wouldn't move (foot to the floor doing 30).

I could smell it was running alittle rich and it was burning alot of oil, and almost smelt like anti-freeze burning too.

Replaced plugs, wires, distributor cap, and rotor today. It ran fine for about 3 miles; it's almost as if the warmer the truck gets the worse it runs. Any suggestions to what it could be? Maybe a bad coil or a bad distributor? Any help would be great !

-Pat
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Old 01-31-2011, 03:35 PM
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My money is on a blown plenum pan gasket causing oil to be ingested into the intake and causing the plugs to foul out. This would explain why it ran fine for a while on new plugs. Are you unexplainably losing engine oil too? Other causes could be a bad crank sensor, coil, PCM...
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Old 01-31-2011, 04:01 PM
jcsmonkay jcsmonkay is offline
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Oil level seems to be fine, although yesterday it was low. I put a quart in, put plugs in yesterday and barely got it home. Checked the level again and it was the same. I'm going to pick up a coil in a few minutes. Any chance the distributor pick plate could be shitted up?
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Old 01-31-2011, 04:05 PM
jcsmonkay jcsmonkay is offline
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When I take the cap off again to check if an electrode is blown (thinking it might be ignition module), ill check the inside of the manifold. I'm assuming if there's and oil slick in there the gasket went. Thanks for the tip.
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Old 01-31-2011, 04:07 PM
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A quart low, huh? I'll bet money on the plenum pan gasket now. Take of the air cleaner and open the throttle body and see if there's oil in the intake. The official diagnostic test is located here - http://www.ramforumz.com/showthread.php?t=46305
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Old 01-31-2011, 04:15 PM
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I just figured it would be a quart low because it's been 4k since my last oil change, and I know it burns a little bit of oil.
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Old 01-31-2011, 04:20 PM
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There is a very small amount of oil in the intake, so I guess the gasket is on its way out anyway.
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Old 01-31-2011, 04:38 PM
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Chances are it's already blown. The first style was a paper gasket prone to failure but replacements are metal.
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Old 01-31-2011, 05:03 PM
jcsmonkay jcsmonkay is offline
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I was just looking at them. Any chance it could be a problem with the computer and trans? Its almost as if the truck wants to shift but then the engine drops rpms down, then kick back up, shift, then itll start shaking and misfiring until 3rd gear, then just bogs out completely.
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Old 01-31-2011, 05:33 PM
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There's other possibilities but the plenum pan definately needs to be addressed because you have to address the most obvious problems first.
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