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Discussion Starter · #1 ·
At around 24,000 miles I've picked up an engine vibration or buzz thru felt mostly at idle and in gear with foot on brake. You can feel it thru the steering wheel or just looking at the motor. If you put your hand on the engine you can just feel it vibrate. When you are driving it you can barely notice it but there is still a slight feeling in the steering wheel. Engine is dead quiet. No loss of power or gas mileage. No mechanical noises coming from it. I've attached a flic from the SRT performance pages engine dyno that show how the torque and engine lines have a squiggle in them showing the vibration. Before this happened engine was sooo smooth. Don't know what it could be.
 

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On my 06 Charger SRT, this was vibration was a cracked motor mount. Could be the same, causing the engine controller/knock sensors to try to compensate for the extra vibration causing the squiggle on the graph.
 

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Squiggles!
 

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Discussion Starter · #5 ·
Can someone check their Durango SRT to see what type of vibrations or shakes you get before I take it to the dealer? As I stated earlier it was smooth as silk then the shakes started around 24,000 miles. Much appreciated.
 

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You can take the acc belt off too to make sure it isn't anything on the front of the motor.
 

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I sometimes get a very slight vibration noise in gear at idle. Put it in neutral and it goes away. It sounds like an exhaust heat shield or heat riser, and it is so slight that I don't think about it much. But IIRC another member mentioned an annoying heat riser noise in another thread. My past motor mount issues on other cars usually resulted in a clunk or bang on acceleration...but I suppose that every car and every failure is different.....
 

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Discussion Starter · #9 ·
Took it to the dealer and got the "Cannot duplicate customers concerns". No misfires, injectors good, motor mounts good, transmission mounts good, coil packs good. They say drive it until it throws a code or starts making noise. Geez, I thought for sure it would show something.
 

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Just a tip: whenever I go to the dealer with a problem that requires them to drive the vehicle to observe the symptoms, I make a note of the odometer reading. If I get it back and it has only been driven less than a half mile, I know they didn't even try. Typically I'll call them on it too.
 

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Take it back and you drive the mechanic around to shop him.
 

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Discussion Starter · #12 ·
I got fed up with the vibration so I ended up changing the spark plugs myself just for sh_ts and giggles. Took about 40 minutes and was easy. After the new plugs were installed.............no vibrations!!!! Night and day difference. Wonder why the dealer could not figure it out? Hmmmmmmmmmm
 

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Interesting....almost sounds like one (or more) of the secondary plugs was bad...Aren't the Hemi engines supposed to have plugs changed at 30k? If so, you were pretty close...wonder if it's just a case of cheap factory plugs?
In any case, good info to have and glad it was an easy fix.
 

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I got fed up with the vibration so I ended up changing the spark plugs myself just for sh_ts and giggles. Took about 40 minutes and was easy. After the new plugs were installed.............no vibrations!!!! Night and day difference. Wonder why the dealer could not figure it out? Hmmmmmmmmmm
Really only took you 40min? To change all 16? Any issues you encountered while accessing them?
Did you go with OEM or some type of upgrade?
 

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Interesting....almost sounds like one (or more) of the secondary plugs was bad...Aren't the Hemi engines supposed to have plugs changed at 30k? If so, you were pretty close...wonder if it's just a case of cheap factory plugs?
In any case, good info to have and glad it was an easy fix.
No. That was only because they used cheap copper plugs. They have since changed over to long life plugs.


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40 minutes start to finish for the 16. There are a couple of areas you will need a shorty extension with a swivel. But, easy change out. Went with OEM Mopar plugs. Was definitely a bad plug. As the vibration/buzz is gonzo!
That's good to know. Changing plugs was one of the things I was dreading having to pay the dealer for. Thanks.
 

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At around 24,000 miles I've picked up an engine vibration or buzz thru felt mostly at idle and in gear with foot on brake. You can feel it thru the steering wheel or just looking at the motor. If you put your hand on the engine you can just feel it vibrate. When you are driving it you can barely notice it but there is still a slight feeling in the steering wheel. Engine is dead quiet. No loss of power or gas mileage. No mechanical noises coming from it. I've attached a flic from the SRT performance pages engine dyno that show how the torque and engine lines have a squiggle in them showing the vibration. Before this happened engine was sooo smooth. Don't know what it could be.
I have the Exact same problem 28 000miles and the feeling is 100% the same
 

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My question is, does the 6.4L engine run the same NGK Iridium plug (or style of plug) that the 5.7L does? If so, that plug is good for 100K and then some. Possibly there was a bad parts run, but I'd expect we would be hearing more of these stories if the issue was widespread.

Don
 
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