Thanks for the update and glad it wasn't anything more complicated.

 

i took the jeep to my dealership, they deemed it also to be the motor mounts. Took a day, and they have replaced both motor mounts under extended warranty

 

May I ask how much did you pay for the extended warranty? I have a 2016 Grand Cherokee and I plan on purchasing the extended warranty on my vehicle. Thank you!

 

I did a how to on replacing the motor mounts, I describe how to test them... ...and they usually leak at the bottom, where the rubber seems to be thinner...

With the hood open, you should be able to peak under the hood and see the top of the motor while sitting in the drivers seat... ...engine running in gear, stand on the brake and give it some gas, this will make the engine twist, new motor mounts the engine barely twists, we're talking fractions of an inch, like a 1/4" to 1/2"... ...put it in reverse and repeat, that will try to twist the motor in the opposite direction... ...Motor mounts totally shot, the motor will move more than an inch, several inches for a really torn up mount...

 

Agreed. I'm guessing it's because they are fluid filled (oil?), the sidewalls of the mount eventually crack and the fluid leaks out. When new they do a great job of absorbing vibrations but don't hold up. Heavy acceleration makes the motor want to twist putting upward strain on the left mount. I had a older Corvette that would actually break the solid rubber mount and allow the engine to lift enough for the fan to hit the shroud. Some started bolting a short piece of chain with no slack in it from the upper "A" frame to the engine. A friend had a Pontiac and when his mount broke, engine twist would pull the accelerator linkage wide open. Eventually solved when they started making mounts that had a hook system connecting the upper and lower mounts molded into the rubber so if the rubber broke the hooks limited twist.

 

Thanks, I will contact the dealer about this. How does the motor mounts go bad at 75k miles? or in your case, 45k miles? seems like a bad design or an issue.

 

You may be able to see leakage from one or both mounts or can watch the engine for movement from above while someone else puts it into and out of gear. The dealer is going to do their own diagnosis anyway but at least you can make arrangements in advance for a loaner/rental and it's usually a one day repair if parts are in stock and they can get to it right away.

 

Check the fluid filled motor mounts. Common issue and mine (2014 V8) were replaced for the same symptoms at around 45K miles. No problems since and now at 72K miles.

 

I do have an extended warranty, but would like to take it to the dealer with an idea (so they dont have it for days on end). Is there a way to check to see if this is the issue? a sure fire way to check that is.