Scratching my head...
#1
Hemi H8R
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Join Date: Nov 2010
Location: Smith Mtn Lake, Va
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Scratching my head...
I have an 06 SCREW 5.4l 4X4 with the only mod being a Flowmaster 30 Series muffler and an Evo programmer. I have begun to notice a slight vibration/miss/shudder/rough idle (yes, all that, it seems) some times while either first starting it up at idle or after driving for several minutes/miles. It almost reminds me of how a 2 cycle bike feels when a plug gets fouled, but not as obvious. I am under the impression that if a plug were fouling it would trip a code, but I have no lights or code alerts. There seems to be no rhyme or reason for why this is happening. The Evo is set at level 3 and I use 93 octane fuel. I tried returning the Evo back to stock settings and drove it for a few days The problem never reoccured, but it is so infrequent and I hate the way the truck runs on stock settings vs. Level 3, so I changed it back after a week to level 3 again. I checked the Evo for an update and it said none were found. Is anyone aware of something that may be causing this? I am not sure what to do from here, but I can't even imaginee the cost of having someone trace it or try to troubleshoot. Thanks for any input. This is a great forum!
Last edited by EMT883; 06-05-2011 at 04:46 PM.
#2
I Like Tires
Could be a misfire on a cylinder which wouldnt be very noticeable when there are 7 other cylinders, or it could be a vaccum leak.
Had something similar to this on my 2001 WS6 Trans Am after taking it out of storage for 2 years and it was a leak on the PCV Line. Replaced the hose and runs great now. Depending on how many miles your truck has these are my best guesses.
Had something similar to this on my 2001 WS6 Trans Am after taking it out of storage for 2 years and it was a leak on the PCV Line. Replaced the hose and runs great now. Depending on how many miles your truck has these are my best guesses.
#3
Senior Member
^ one cylinder missing is very noticeable. It could be many things but I'd wait for it to get worse before trying to fix it. And my truck has a terrible miss right now and it won't throw a code.