2013 GL450 rattle on passenger side near turbo
07-23-2020, 04:10 PM
#1
Member
Thread Starter
2013 GL450 rattle on passenger side near turbo
My 2013 GL450 runs and drives amazing but when I do a cold start it's loud like there is an exhaust leak and there is a rattle sound.
The sound only last for a few seconds until the RMP's drop and then it's as quiet as a mouse. The sound never happens again under any other circumstance other than a cold start.
No smoke, no leaks, doesn't burn oil, no codes (or stored codes).
When you open the hood and look on the passenger side, about 6 inches behind the main body of the turbo appears to be the source of the sound. I can actually reach my hand down there and touch/move something that is metallic.
Based on how I'm able to wiggle it (millimetres at most), it seems to be the end of a possible butterfly hinge, like you would find on a throttle body. So my assumption is that it is supposed to have some degree of movement but not as much as it currently has.
Could it be the waste-gate? Anyone else had this issue?
Again. zero performance issues and it only happens for seconds on a cold start up.
The sound only last for a few seconds until the RMP's drop and then it's as quiet as a mouse. The sound never happens again under any other circumstance other than a cold start.
No smoke, no leaks, doesn't burn oil, no codes (or stored codes).
When you open the hood and look on the passenger side, about 6 inches behind the main body of the turbo appears to be the source of the sound. I can actually reach my hand down there and touch/move something that is metallic.
Based on how I'm able to wiggle it (millimetres at most), it seems to be the end of a possible butterfly hinge, like you would find on a throttle body. So my assumption is that it is supposed to have some degree of movement but not as much as it currently has.
Could it be the waste-gate? Anyone else had this issue?
Again. zero performance issues and it only happens for seconds on a cold start up.
07-23-2020, 04:16 PM
#2
There is an old TSB for these earlier 2013/14 model years for a chain tensioner noise on cold starts. I actually just had this rear its head on my 2014 GL450 for the first time (66k miles). Getting my car back tomorrow, hope the noise is fixed.
07-23-2020, 04:29 PM
#3
Member
Thread Starter
Thanks for that information but I think it's a different issue. The reason I say that is because on one of my cold starts I took a rod and pushed it against that loose metal hinge thingy behind the turbo (that I referenced up above) and the rattle stopped. There would be nothing I could do externally to stop a timing chain or tensioner from rattling.
