Rumble strip noise
#1
Rumble strip noise
New to this forum. I have a 2005 S Type that I recently purchased. Sounds like running over a rumble strip and feels like a misfire although I think it is related to transmission. Can anyone help me? No codes. Have had several shops look at it with no answer. A Mercedes shop told me it is a bad torque converter.
#4
The following 2 users liked this post by tbird6:
joycesjag (12-13-2013),
Jumpin' Jag Flash (12-20-2013)
#5
#7
If it's the torque converter, is there a way to disable the lockup feature for troubleshooting? Perhaps the fault is just below the threshold that sets the code.
On my '02, I was under the impression downshifting from D to 4 (across the bottom of the J gate) doesn't actually change gears, but simply turns off the power to the clutch in the torque converter. I know the shift cable doesn't move when shifting between D and 4, but there is a microswitch in there that clicks. Not sure if I'm even close with this idea, or if it's even the same on your '05, but hopefully somebody else could weigh in.
On my '02, I was under the impression downshifting from D to 4 (across the bottom of the J gate) doesn't actually change gears, but simply turns off the power to the clutch in the torque converter. I know the shift cable doesn't move when shifting between D and 4, but there is a microswitch in there that clicks. Not sure if I'm even close with this idea, or if it's even the same on your '05, but hopefully somebody else could weigh in.
The following users liked this post:
rhinoman (12-13-2013)
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#8
#10
Snag is... S-Types don't use the Merc trans.
The PCM largely determines which gear the trans (ZF 6HP26) is in, together with the TCM (in the trans).
Worth doing things (like rotating tyres front/rear) to rule out cheaper and easier to fix possible causes. So far it does sound like the TC.
The PCM largely determines which gear the trans (ZF 6HP26) is in, together with the TCM (in the trans).
Worth doing things (like rotating tyres front/rear) to rule out cheaper and easier to fix possible causes. So far it does sound like the TC.
#11
New to this forum. I have a 2005 S Type that I recently purchased. Sounds like running over a rumble strip and feels like a misfire although I think it is related to transmission. Can anyone help me? No codes. Have had several shops look at it with no answer. A Mercedes shop told me it is a bad torque converter.
What gear?
Turning/going straight?
Hot engine?
#12
Rumble strips
Around 50 mph slight load on engine. Engine not running hot.
I tend to believe it is the torque converter, although the noise and surge occur at different times they both go away when you accelerate or let off of the gas.
I tend to believe it is the torque converter, although the noise and surge occur at different times they both go away when you accelerate or let off of the gas.
#14
#15
Just got a call from an independent shop, he ran diagnostics on engine and transmission.
Says the MAF needs cleaning and no codes on transmission. He said the bushing in the lower rear control arm is worn and thinks that is what is making the rumble strip sound.
Does that make sense to anyone?
Says the MAF needs cleaning and no codes on transmission. He said the bushing in the lower rear control arm is worn and thinks that is what is making the rumble strip sound.
Does that make sense to anyone?
#19
#20
Just got a call from an independent shop, he ran diagnostics on engine and transmission.
Says the MAF needs cleaning and no codes on transmission. He said the bushing in the lower rear control arm is worn and thinks that is what is making the rumble strip sound.
Does that make sense to anyone?
Says the MAF needs cleaning and no codes on transmission. He said the bushing in the lower rear control arm is worn and thinks that is what is making the rumble strip sound.
Does that make sense to anyone?
No idea if the MAF sensor could be part of the equation, but I doubt the suspension fault would make the noise you've described. From my experience, worn suspension parts cause clunking, especially at lower speeds, and sloppy handling. I've never had one make a buzzing sensation, not that it's impossible.
Did you ever get a chance to drive around with the transmission downshifted one notch from D? Even if the TC control logic is different compared to my '02, the results may still provide a big clue.