Or me...?

 

lmao... a counter balance shaft???? what a joke. your dealer sounds alot like the local dealer that USEDto be in business where I live. I took my truck in for a rough idle (it's a 3.9) and they told me they would have to charge like 500$ to tear down the engine and run some combustion chamber cleaner through it. I told them to **** off, took it home... ran seafoam through it, changed the TPS and IAC celanoid along with plugs and the truck ran great. I would say that your rough idle is caused by a very dirty throttle body. Im not sure what sensors are on the 4.7's throttle body but i would say replace them or clean them up. A dirty sensor will cause rough idling some of the time like you said.

 

Same here. No problems except for rear vibration issue for which there was a TSB. Dealer fixed it...n/c. Problem solved. I'm 3 years along and no other problems at all.

 

If you have a rough idle, change to the AutoLite 3923's. On my last Dak, I changed them and what a difference. On this new one, I will be changing them when it gets warmer just to be safe...and for a little more umph!

 

Thanks for the feedback guys,,,,as for changing the plugs, done that. Had recomendations for both Autolite and NGK, I went with NGK Iridiums. No improvement. And the dealer has flushed everything possible, it's been flush more than a bus station cammode. Still no improvement. The dealer has also ran two diagnostics on it and says the computer says everythink is running right, no misfires.

I think it's a balance problem because it's there atidle and fades out at about 14~1500 RPM. Other than that the engine runs and preformsfine and with my daily driving I can squeeze about 20mpg out ofit.

My primary grip is thatfor $22,000 I shouldn'thave to settle for a vehicle that shakes when I'm setting at a stop.I feel like I was sold a defective product. Don't get me wrong I've been a Dodge owner since 1972. One, aB200van I bought new in '76, I ran until 1999.But I've never had a problem like this with any of them.

 

I just changed mine at 21k on it and it is smoother. I never had a "rough" idle but not as smooth as other V8s. Also I noticed my TB was pretty dirty I wiped all the cabon out near the butterfly so that might of helped. Anyway change the plugs, heck only 10 bucks and 45 minutes time!

 

I have a hard time believing your idle will "get better sometimes" due to an improperly balanced engine. Based on the information you have given, the idle would not clear up 20% of the time if it was a mechanical problem (balancing). It would be a constant.

My race motor is balanced, blueprinted, no balance shafts, and poly u motor mounts. It idle's just fine...however, I have severe vibration at idle. The 280 adv. duration cams only add to the vibration. But, it idles. We need to know if you are feeling vibration, or if the motor is idling incorrectly.

My initial thoughts are that you should check the fuel system. Clogged injectors, dirty fuel filter (the sock at the pump), debri in the lines, are all things you should consider in addition to changing the plugs. Also, if timing is off (cam or ignition) this will cause a "rough" idle as well. Now, the likely hood of the cam timing to off should be minimal, but it is possible.

Just my 2 cents.

 

I agree, Donkeypunch, an embalance would be consistent and my vibration is. Bookerg was the one with the 80% thing going and your suggestions are a good route for him totake. I've already gone through all of that to the point of removing the heads, that is my dealer has and the vibration is still there. Like I said earlier it fades out at about 1500rpm.
I've talked to three different service managers at three different dealers and gotten three different answers, yea, I know, what did I expect,,,right. From the District Manager all the way down to the mechanic in the shop,,,,,,,,nobody knows nothing.

 

Dropped by the local dealer for my regular Friday visit and went through the ordeal again this time with the service manager and a mechanic, now they want to change the harmonic balancer.

Here's one just for laughs,,,,when I was leaving the service manager said his district managertold him that the Dakotas with a 4.7 would idle rough because it was a small truck with a big engine,,,,,,,,when did 287ci become big?? ....beam me up, Scotty.