300E IAC location?
Thread Starter
Newbie
Joined: Oct 2010
Posts: 4
Likes: 0
From: Ohio
1993 300E W124 028 FI M104 2.8L
300E IAC location?
Can anyone tell me where the IAC is located in the vehicle? I've seen several posts explaining how to clean or replace, but not where it is located in the engine compartment.
Thanks in advance for your help.
Thanks in advance for your help.
Thread Starter
Newbie
Joined: Oct 2010
Posts: 4
Likes: 0
From: Ohio
1993 300E W124 028 FI M104 2.8L
Ok. Found out since I have the M104 engine, I do not have a IAC. I have an electronic throttle actuator instead. I cleaned the MAF sensor and intake air temp sensor, but still experiencing sporadic rough idle.
MBWorld Fanatic!
Joined: Nov 2002
Posts: 1,028
Likes: 133
From: Massachusetts
2018 GLE350, 2014 G550, 2000 SL500, 1980 TR8, 1995 E320 Cabriolet
IAC = Idle Air Control. N/A to the M104
mjd1616 -
Not sure if your year is affected, but check the upper engine wiring harness. Bosch developed a "wonderful" biodegradable insulation that didn't wait until the car was in the bone yard to degrade. The flaky insulation can cause all kinds issues including rough idle (the primary wiring to the ignition coils seems to deteriorate significantly due to the heat right on top of the cylinder head). The wiring to the electronic throttle can also deteriorate causing even more fun problems.
Check your engine mounts as well. I had a rough idle too and was told to replace them. Sure enough, roughness gone. They are fluid filled as do an amazing job of dampening engine vibrations. If (when) the fluid leaks out, things get rough.
Hope this helps,
- FD
mjd1616 -
Not sure if your year is affected, but check the upper engine wiring harness. Bosch developed a "wonderful" biodegradable insulation that didn't wait until the car was in the bone yard to degrade. The flaky insulation can cause all kinds issues including rough idle (the primary wiring to the ignition coils seems to deteriorate significantly due to the heat right on top of the cylinder head). The wiring to the electronic throttle can also deteriorate causing even more fun problems.
Check your engine mounts as well. I had a rough idle too and was told to replace them. Sure enough, roughness gone. They are fluid filled as do an amazing job of dampening engine vibrations. If (when) the fluid leaks out, things get rough.
Hope this helps,
- FD
