Join Date: Nov 2009
Location: Near Pittsburgh, PA
Thud/Clunk/Jerk When Changing to Drive or Reverse
2007 GT 3.5 auto with almost 120k on the odometer.
My wife informs me that recently in the morning she will notice a jerk in the engine when she puts it in drive or reverse. It doesn't really make a noise. Its more like you can feel the whole car shudder for an instant. It just happens once into the forward/reverse gears. It doesn't do it going into neutral or park.
I had her cycle the gears a few times while I watched. It is definitely kicking forward/backwards on each switch. Looks like maybe a motor/transmission mount isn't doing its job.
But it shifts smooth while driving. Even under a heavy load or a spirited take-off. I've checked the 2 mounts I can see, but how and where do I check the transmission mount?
I've also noticed the engine idles very poorly. It bounces almost 700 RPMs randomly when just sitting in park idling. This started really close to when the transmission started jerking, apparently.
Of course both of these problems are more pronounced when the car is cold. Almost none-existant once its fully warmed and been driven for awhile.
So far I've checked the fluid level. It was filled to the top but looks and smells like it should be changed.
The front mount and side mount on the engine are tight. I can't move them more than a few MM with a prybar. Is there a better method to test them?
May not be related but these are the things I've replaced in the past 6 months: radiator, front cat, all O2 sensors, tires, spark plugs, brake pads and rotors all around, and oil many, many times.
No trouble codes at all.
I would appreciate any advice you could give to help me out here. Thanks.
Last edited by s10blazed; 08-12-2013 at 12:52 PM.