2009 GL 450 drivetrain noise, please help diagnose
10-14-2018, 09:24 PM
#1
2009 GL 450 drivetrain noise, please help diagnose
If you'd like to jump straight to my video where you can hear the noise, click here:
Or try this video and start at 1:00 into the video where it gets really loud.
2009 GL 450. Vin 4JGBF71E89A515714
Noise is getting progressively louder. I took the video when the car was parked. It's most noticeable in reverse, but is pretty loud when in drive. Louder when turning to the right.
The odd thing is, if the car is parked and I turn the steering wheel slightly off center, the noise usually goes away. It also goes away when switching between P, R, and D.
The car has been to 3 Mercedes specialists, and they're unable to find anything. Over $1000 later, I'm tired of paying $125/hr for diagnostic work.
While driving last week, at cruise on the interstate, the car popped out of gear and had to be towed to a service center. I was told the driveshaft and transmission output shaft coupling had to be replaced. I fixed it and paid a bill for $2500. Was hoping that was related to the noise, but it's only gotten worse.
One mechanic in Denver thinks it's related to a driveshaft, but how would it make noise when the car is parked and the driveshaft isnt' turning?
Any ideas guys? Thanks, much appreciated.
2009 GL 450. Vin 4JGBF71E89A515714
Noise is getting progressively louder. I took the video when the car was parked. It's most noticeable in reverse, but is pretty loud when in drive. Louder when turning to the right.
The odd thing is, if the car is parked and I turn the steering wheel slightly off center, the noise usually goes away. It also goes away when switching between P, R, and D.
The car has been to 3 Mercedes specialists, and they're unable to find anything. Over $1000 later, I'm tired of paying $125/hr for diagnostic work.
While driving last week, at cruise on the interstate, the car popped out of gear and had to be towed to a service center. I was told the driveshaft and transmission output shaft coupling had to be replaced. I fixed it and paid a bill for $2500. Was hoping that was related to the noise, but it's only gotten worse.
One mechanic in Denver thinks it's related to a driveshaft, but how would it make noise when the car is parked and the driveshaft isnt' turning?
Any ideas guys? Thanks, much appreciated.
10-16-2018, 03:14 PM
#2
MBWorld Fanatic!
Weird how it come and goes. But I'll take a WAG, transfer case chain?
Anything to do with the power steering? Loose high pressure hose left unbolted
by mechanics banging against something? They love to just not put all the bolts back.
Anything to do with the power steering? Loose high pressure hose left unbolted
by mechanics banging against something? They love to just not put all the bolts back.
10-16-2018, 07:15 PM
#3
If you'd like to jump straight to my video where you can hear the noise, click here: https://youtu.be/jT-xymqP-DM
Or try this video and start at 1:00 into the video where it gets really loud. https://youtu.be/S1122H2gRUw
2009 GL 450. Vin 4JGBF71E89A515714
Noise is getting progressively louder. I took the video when the car was parked. It's most noticeable in reverse, but is pretty loud when in drive. Louder when turning to the right.
The odd thing is, if the car is parked and I turn the steering wheel slightly off center, the noise usually goes away. It also goes away when switching between P, R, and D.
The car has been to 3 Mercedes specialists, and they're unable to find anything. Over $1000 later, I'm tired of paying $125/hr for diagnostic work.
While driving last week, at cruise on the interstate, the car popped out of gear and had to be towed to a service center. I was told the driveshaft and transmission output shaft coupling had to be replaced. I fixed it and paid a bill for $2500. Was hoping that was related to the noise, but it's only gotten worse.
One mechanic in Denver thinks it's related to a driveshaft, but how would it make noise when the car is parked and the driveshaft isnt' turning?
Any ideas guys? Thanks, much appreciated.
Or try this video and start at 1:00 into the video where it gets really loud. https://youtu.be/S1122H2gRUw
2009 GL 450. Vin 4JGBF71E89A515714
Noise is getting progressively louder. I took the video when the car was parked. It's most noticeable in reverse, but is pretty loud when in drive. Louder when turning to the right.
The odd thing is, if the car is parked and I turn the steering wheel slightly off center, the noise usually goes away. It also goes away when switching between P, R, and D.
The car has been to 3 Mercedes specialists, and they're unable to find anything. Over $1000 later, I'm tired of paying $125/hr for diagnostic work.
While driving last week, at cruise on the interstate, the car popped out of gear and had to be towed to a service center. I was told the driveshaft and transmission output shaft coupling had to be replaced. I fixed it and paid a bill for $2500. Was hoping that was related to the noise, but it's only gotten worse.
One mechanic in Denver thinks it's related to a driveshaft, but how would it make noise when the car is parked and the driveshaft isnt' turning?
Any ideas guys? Thanks, much appreciated.
If if it is coming from the transmission your torque converter is suspect.
Just random thoughts
Last edited by alx; 10-16-2018 at 07:18 PM.
10-18-2018, 02:13 AM
#4
You should invest into a mechanic stethoscope. Pure mechanical one, not electronic.
Due to insulation hunting noises is a ***** in a GL. We acquired our used so I was hunting all kind of noises. One that drove me nuts and felt coming from inside and varied by rpm turned out to be a broken off exhaust temperature sensor bung! Raise the car suspension, get 4 plastic ramps and a creeper and get under the car while it is cold and check all exhaust sensors from oxygen to temperature.
Due to insulation hunting noises is a ***** in a GL. We acquired our used so I was hunting all kind of noises. One that drove me nuts and felt coming from inside and varied by rpm turned out to be a broken off exhaust temperature sensor bung! Raise the car suspension, get 4 plastic ramps and a creeper and get under the car while it is cold and check all exhaust sensors from oxygen to temperature.
