idle control valve and throttle body
Thread Starter
Senior Member
Joined: Jul 2007
Posts: 421
Likes: 14
From: Bay Area
2004 E500 CLK320
idle control valve and throttle body
Does anyone know of a DIY procedure in removing the throttle body and idle control valve? My C280 is idling rough when cold. I want to clean the ICV and throttle body, hopefully that will cure the problem. I thought I have located the ICV in the front of the engine, but that's not it. Also, a new MAF sensor is installed, but that didn't cure the cold start rough idling problem.
Newbie
Joined: Jul 2009
Posts: 2
Likes: 0
1997 C280 Sport
Have you had the car connected to a diagnostic scanner? even if the CEL is not on there could be errors in the ECU that might give you an idea as to what could be causing the problem.... also check for air or vacuum leaks...
Thread Starter
Senior Member
Joined: Jul 2007
Posts: 421
Likes: 14
From: Bay Area
2004 E500 CLK320
I was in the indy shop yesterday and the shop has the latest computer from MB, the only code came up was the MAF sensor. But I had the MAF sensor replaced 2 wks ago. The tech said i needed to reset the code, although there was no CEL in the first place. Well, problem is still not solved.
Newbie
Joined: Jul 2009
Posts: 2
Likes: 0
1997 C280 Sport
What type of air filter
this might be a silly question.. but do you use an aftermarket Air filter like a K&N or Green Filter that have to be spray with an oily spray..... the reason I ask is that the Airmass sensors on these cars can be contaminated very easily with the oils from these filters... also check the wiring to the airmass meter sometimes they can get dry and cracked on the insulation and this can cause all kinds of problems... peal back some of the tape that covers the wiring...especially if it runs close to the engine...
Thread Starter
Senior Member
Joined: Jul 2007
Posts: 421
Likes: 14
From: Bay Area
2004 E500 CLK320
thanks for the suggestion. The air filter is new, Frame air filter. The wire harness to the MAF seems ok. I'll double check the wire harness again. And there's no CEL.
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Senior Member
Joined: May 2008
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From: Manila, Philippines
1994 C220
this might be a silly question.. but do you use an aftermarket Air filter like a K&N or Green Filter that have to be spray with an oily spray..... the reason I ask is that the Airmass sensors on these cars can be contaminated very easily with the oils from these filters... also check the wiring to the airmass meter sometimes they can get dry and cracked on the insulation and this can cause all kinds of problems... peal back some of the tape that covers the wiring...especially if it runs close to the engine...
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Newbie
Joined: Mar 2012
Posts: 4
Likes: 0
94 c280
Does anyone know of a DIY procedure in removing the throttle body and idle control valve? My C280 is idling rough when cold. I want to clean the ICV and throttle body, hopefully that will cure the problem. I thought I have located the ICV in the front of the engine, but that's not it. Also, a new MAF sensor is installed, but that didn't cure the cold start rough idling problem.
I'm new to the cite. Im the proud owner of a 94 c280 w/224k miles that runs like a champ. However, when I replaced my throttle body (yesterday) my car begin to idle really high when in P and surges when in D. How do I fix this?
Newbie
Joined: Mar 2012
Posts: 4
Likes: 0
94 c280
Newbie
Joined: May 2012
Posts: 6
Likes: 0
1995 c220
Ok first off, why would I need gasket maker for the mass air flow? Second I also noticed that my my c220 does not idle high during warm up in the morning. All this started when I cleaned out my throttle body. Note I just picked this car up so I kinda married myself to problems. I could not pass up a good deal on this car.
Newbie
Joined: May 2012
Posts: 6
Likes: 0
1995 c220
I also have a problem with the cold start. In the morning I hear something in the engine bay hissing but my idle stays at 750 or so. Once warmed up idle rises up to 1200 due to the code p0505 I'm guessing. Does anyone know where the cold start valve is located if it has one or is it part of the problem I'm having with the idle air control valve?
Newbie
Joined: May 2012
Posts: 6
Likes: 0
1995 c220
Any help on this issue? I'm thinking it's the throttle body. Anyone from California Los Angeles area know of someone that could rebuild them? Plz any help on this problem. Also would this cause shifting issue with transmission?
Newbie
Joined: Jul 2012
Posts: 1
Likes: 0
GL450, C220, ML320
Hi kmont28
I have a '95 c220 with the same problem (runs very rough when cold and so so when engine is very warm) as yours kindly let me know what you finally did to correct this problem - best regards
I have a '95 c220 with the same problem (runs very rough when cold and so so when engine is very warm) as yours kindly let me know what you finally did to correct this problem - best regards
Newbie
Joined: May 2012
Posts: 6
Likes: 0
1995 c220
mepragma well i still have no response from anyone that has had a fix for it. i have been messing around with this car and i came to the conclusion that in fact it is the throttle body actuator. Now i am trying to find a wiring schematic so i can remove the throttle body and maybe find the wiring causing the idle problem. Im also trying to find the prober throttle linkage adjustment with pictures and i think its the automatic transmission cable adjustment settings. if anyone has any info or suggestions please post.
