Rough idle in my 430..what should I be looking for?
Thread Starter
Junior Member
Joined: Aug 2016
Posts: 29
Likes: 1
From: Edmonton, Alberta, Canada
2002 Mercedes-Benz CLK 430 Coupe
Rough idle in my 430..what should I be looking for?
My 2002 430 has a bit of a rough idle. I realize engine mounts might be the cause but is there anything I should be looking at? I'm new to MB so I'm not too sure if there is a MAF to clean or a Idle Valve that needs looking at...
No idea how old the plugs are or if the throttle body needs attenion...
No idea how old the plugs are or if the throttle body needs attenion...
Member
Joined: Jan 2008
Posts: 249
Likes: 5
From: Kansas City/Lawrence, KS
2001 CLK 430 w/5.4 swap, 2000 CLK430
My 2002 430 has a bit of a rough idle. I realize engine mounts might be the cause but is there anything I should be looking at? I'm new to MB so I'm not too sure if there is a MAF to clean or a Idle Valve that needs looking at...
No idea how old the plugs are or if the throttle body needs attenion...
No idea how old the plugs are or if the throttle body needs attenion...
The breather hoses running from the top of the crankcase also tend to crack if the car has been sitting too long, so there may be a vacuum leak. They can be found for pretty cheap as well.
Thread Starter
Junior Member
Joined: Aug 2016
Posts: 29
Likes: 1
From: Edmonton, Alberta, Canada
2002 Mercedes-Benz CLK 430 Coupe
Member
Joined: Apr 2012
Posts: 139
Likes: 8
From: Space Coast Florida
2008 E320 Bluetec
When I had this problem I did a lot of things, Plugs, cleaned MAS, and the usual needed, new air filters...but the final thing that smoothed the idle out was replacing the gaskets that seat the MAS and the 90 degree air tube under it. It is 3 gaskets and mine were harddened and not sealing well.
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Super Member
Joined: Mar 2005
Posts: 932
Likes: 38
From: North of Boston
Check MAF and vacuum lines...This engine is almost bullet pt=roof...if you do some searches on the MB forums the basic issues that crop continually are MAF, CPS and bad seat motors...yours surely sounds like bad MAF or vacuum line.
