matt1983

I have a 2003 CL and have been experiencing this problem for more than a year now. During this time, I have tried a few things and performed fixes of other problems (thanks to the wonderful guides in this forum!) which I will list below. When I'm driving between 50 and 55mpg (some times between 50 and 60), the car shakes dramatically, usually during acceleration. I can overcome this by giving the engine more gas. This happens regularly every day and I'm worried I might have a transmission problem. The car now has about 165K miles on it and when it was < 100K, the dealer replaced the transmission under the recall. The transmission fluid is only slightly dark, almost appearing as it did when it was new, and there is no "burnt smell."

I haven't found anyone else on these forums who describe this problem quite the way I am experiencing it so any advice would be greatly appreciated. Thanks!

-Replaced ignition coils
-Replaced fuel pump
-Replaced fuel pump relay (car wouldn't start in the hottest weather)
-Regular oil changes and 93 octane fuel every time

nicroc

Check your motor mounts. Expecially the right one. And buy oem not aftermarket. I was looking into replacing my mounts with some from IP but I read on here that there is a design flaw for the side mount and that a lot of ppl use just the front and rear and still keep oem for the side. Also theres some talk about the IP ones donuting after a while. Hope this helps.

mike7792

I recently had a somewhat similar experience but at lower speeds.

The car would sound like the gears were grinding and/or about to stall if i didn't slam the clutch or give more gas

It turned out my cold air intake had come loose from the throttle body thus not having a tight seal.

straightened it out and it fixed the problem.

matt1983

I will check the vacuum hose. My car has no unusual noises, though.

Concerning the engine mount, I have replaced the right mount to correct a heavy knocking problem. I used an aftermarket product and have noticed that the rubber which provides cushioning has cracked since it was installed about a year ago. I expect to have to replace it again.

During the bucking and shaking, the feeling is definitely caused by interruption of the vehicle's propulsion. Think of the space shuttle on take-off, but not as bad.

Thanks again all!

Scratcher09

That sounds exactly like the problem I was having with my '01 TL Type S. it was a shudder from 55 to 60. It would immediately stop if I let off the gas or floored it. Before I sold it i did the 3X trans flush and changed all motor and trans mounts. It significantly improved the problem. After that it was only barely detectable. I could not tell the mounts were bad by the visual inspection, but when I pulled them out, they were all in bad shape. I wish i had done it sooner. Hope this helps.

fuzzy02CLS

iTrader: (2)

Axles are another thought. With those high miles they are past their lifespan.

Tosh

There's also 'Engine Mount Control System' to check. Procedure starts on p.4-47 in the Helms service manual.

nicroc

Did u figure it out?

OperationDarkie

iTrader: (1)

What is the life expectancy for axles??? cause I have yet to change mine and I get a vibration only when WOT, so I am assuming the axles are shot.