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  #11  
Old 02-24-2013, 07:56 AM
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That's the intake air temp sensor. While it does need to be plugged in and working, it won't cause a cylinder specific misfire. Since you seem to have checked the plenum pan visually through the throttle body, I'm posting the diasgnostic for this as Chrysler recommends. One other thing - try removing the serpentine belt and running the engine and see if the problem goes away. It's rare, but I have seen a perceived misfire turn out to be an accessory problem.
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  #12  
Old 02-24-2013, 01:09 PM
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Originally Posted by RamTech View Post
That's the intake air temp sensor. While it does need to be plugged in and working, it won't cause a cylinder specific misfire. Since you seem to have checked the plenum pan visually through the throttle body, I'm posting the diasgnostic for this as Chrysler recommends. One other thing - try removing the serpentine belt and running the engine and see if the problem goes away. It's rare, but I have seen a perceived misfire turn out to be an accessory problem.
I found it interesting because I can't find a connector for it anywhere in the engine bay.

I'll be removing the belt in the next 20 minutes then, will report back.
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  #13  
Old 02-24-2013, 01:18 PM
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There should be one there for it somewhere. I'm a bit surprised it hasn't set a code in the PCM.
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Old 02-24-2013, 02:21 PM
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There should be one there for it somewhere. I'm a bit surprised it hasn't set a code in the PCM.
No codes for it, you're guess is just as good as mine in this case.

Removal of the serpentine belt yields no change in shudder. It's definitely misfiring.
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Old 02-24-2013, 08:05 PM
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I'd say it's time to pull the valve cover and check for a worn cam lobe, bent pushrod, or broken valve spring.
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Old 02-25-2013, 02:05 AM
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I'll have to do that when I have more time.


Well, in addition to all this - brought the car to a car wash. Had the truck running while I brought it to an automatic car wash. Wash had undercarriage jets so the entire engine bay was wet.

Well truck started running rough and idling very very low. As soon as I would touch the throttle the truck would rev straight up to 2k rpm.

Somethings off here.
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Old 02-25-2013, 08:08 AM
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Have you checked the electrical connectors for signs of water intrusion?
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  #18  
Old 02-28-2013, 12:57 AM
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Have you checked the electrical connectors for signs of water intrusion?
Turns out the wires on my front O2 sensor were frayed and when in contact with water would short have the truck backfire out of the intake. New O2 sensor and now I can go through puddles like a madman and nothing will happen. Truck runs great aside from this studder.

I've noticed it does this more when the truck is cold (first starts on a cold morning, or when left to cool off). There's a more noticeable vibration.


Anyhow, I've also noticed it seems like this truck might have had a charcoal canister? If so, that's been removed. I have what seems to be some vent lines plugged up that seem to run to the fuel tank? Not entirely sure what the deal is with those.
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Old 02-28-2013, 01:07 AM
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also have cranked over the motor a few times by the crank to check the valves and see if i find any that aren't opening fully or closing completely. well, they're all peachy. nothing is binding and nothing seems out of the ordinary. i'm still confused by this thing - at this point its become a game of patience.
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  #20  
Old 03-02-2013, 11:06 PM
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Well, I sold the truck. Tired of chasing a rogue issue.

New owner is happy with the truck regardless of the vibration. He told me it wasn't as bad as I was describing. Maybe I'm crazy.

Story over.
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