MB replaced the cylinder head due to leaky valve
Thread Starter
Super Member
Joined: Feb 2009
Posts: 692
Likes: 73
From: Houston, TX
2003 E55 AMG; 2013 GL550 4Matic; 2003 CL600
MB replaced the cylinder head due to leaky valve
I'm not sure how widespread this info is, but MB extended the warranty for exhaust value issues on the M157 and M278 motors.
If you have a compression test failure / misfire caused by worn valve seats, at less than 10y and less than 120k miles, you could get a new cylinder head.
I just got my GL550 back from having this done, much better now.
If you have a compression test failure / misfire caused by worn valve seats, at less than 10y and less than 120k miles, you could get a new cylinder head.
I just got my GL550 back from having this done, much better now.
Senior Member
Joined: Jul 2022
Posts: 464
Likes: 99
2014 E63 / 2017 CLS 63 / 2015 G63
I'm not sure how widespread this info is, but MB extended the warranty for exhaust value issues on the M157 and M278 motors.
If you have a compression test failure / misfire caused by worn valve seats, at less than 10y and less than 120k miles, you could get a new cylinder head.
I just got my GL550 back from having this done, much better now.
If you have a compression test failure / misfire caused by worn valve seats, at less than 10y and less than 120k miles, you could get a new cylinder head.
I just got my GL550 back from having this done, much better now.
Thread Starter
Super Member
Joined: Feb 2009
Posts: 692
Likes: 73
From: Houston, TX
2003 E55 AMG; 2013 GL550 4Matic; 2003 CL600
There might be a code stored in the ECU which Xentry can read. IT would say something like "the injector adjustment is beyond acceptable parameters" but it wouldn't necessarily misfire enough to store an OBDII code.
Junior Member
Joined: Oct 2021
Posts: 27
Likes: 3
S550
Great, another thing to think about. I just had a misfire and thought it was the coil. Luckily, I swapped the coil with another and the misfire changed cylinders. I wonder how you would know it is this vs just a coil issue.
Thread Starter
Super Member
Joined: Feb 2009
Posts: 692
Likes: 73
From: Houston, TX
2003 E55 AMG; 2013 GL550 4Matic; 2003 CL600
