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  #1  
Old 04-18-2011, 11:21 AM
TxAg2007 TxAg2007 is offline
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Default '05 misfire and rough idle at start

For the past month I have had an issue that has been perplexing me and my mechanic. I'll start up the truck, and after about 200 ft I come to a stop. The truck will dip below 500 rpm, and shake violently. It does it for 30 seconds tops. After that the truck will continue on as normal. The CEL came on, and was spitting the obligatory P0300 code. I took it down to my mechanic who did some work on it. I did some work on it too. This is what has been done so far:

All O2 sensors replaced
IAC valve cleaned
TB cleaned
Seafoam treatment

Even with all of this work done, it continues to do the same thing. I feel as though it may be idling a little heavy, but nothing like when I start it in the morning. I've heard that this problem could be a range of issues, from asymmetrical valve, to ignition coil. I thought I'd get y'alls take. Thanks in advance.
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Old 04-18-2011, 11:26 AM
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You need to find out which cylinders are misfiring. Still sounds like heavy carbon buildup on the valves to me.
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Old 04-18-2011, 11:34 AM
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Wouldn't something like a Seafoam treatment rid most carbon build-up? I've run two for good measure, and there has been no change. The mechanic ran a full diagnostic test, and he cant seem to pinpoint which cylinder is misfiring.
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Old 04-18-2011, 11:40 AM
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A DRB III scan tool will tell you which cylinder is misfiring. If the carbon buildup is thick enough, SeaFoam won't fix it. The heads will have to come off and the carbon removed with a wire wheel on a grinder or the valves will need replacing.
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Old 04-18-2011, 11:46 AM
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Thanks RamTech. Is there a possibility of it being a vacuum leak? I've heard that these are common issues also.
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Old 04-18-2011, 11:51 AM
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Pretty unlikely at this point. I would think your mechanic would already have checked for this.
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Old 04-18-2011, 11:54 AM
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Ok. I'm starting to think my current mechanic is a bit inept. Thanks again.
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Old 04-18-2011, 11:55 AM
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If you want to check for a leak yourself, get a can or carb cleaner and spray any suspect areas while the engine is running. If there's a leak, you'll hear a change in engine rpm.
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Old 06-30-2011, 01:12 PM
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So I brought the truck to multiple mechanics since my problem began. I had one do as you had said. Apparently it wasn't the problem. So this is the list of things that have been replaced/fixed/done:

Camshaft sensor replaced
crankshaft sensor replaced
All O2 sensors replaced
All Spark plugs replaced
Decarb - twice
IAC valve checked
Fuel treatment

My last trip was made to the dealer service dept, who claimed it was faulty spark plugs. It wasn't. So it's been 5 months now. Not even a Dodge mechanic could diagnose and fix it. What the hell could it be?

I read this somewhere:
Vehicle Issue Engine Runs Rough. MIL On. Will have one or more of Fault Codes
P0300 - P0308.;1999 - 2005 3.7, 4.7, 5.7 engines. Possible fault codes P0300,
P0301, P0302, P0303, P0304, P0305, P0306, P0307 and P0308. Cylinder leakage
test indicates air leakage past valve. There is no visible problem with valve
when head is removed.





Recommendation With the cylinder head removed, use a known good valve and coat
the valve facing / valve seat contact area with valve lapping compound. By
hand, firmly pull the valve against the seat and rotate valve a few times.
Remove the valve and check for a Symmetrical contact pattern on valve seat. If
the pattern is not symmetrical replace cylinder head. If pattern is good,
replace suspect valve.

I have just about given up on this truck.
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Old 07-05-2011, 07:05 PM
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Is it just the P0300 or are you getting specific cylinder misfire codes too?
How is the wiring harness? No frays or cut wires?
Stock Cam?
If the wiring harness is okay then i would have the valve covers pulled to check the push rods to make sure they are seated correctly.
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Last edited by TheSatinPumpkin; 07-05-2011 at 07:21 PM.
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