funkgab

i'm guessing it idles fine in park?

CALIFORNIAICE

Funkgab, yeah on park the surge is barely noticeable if any. Once on drive, or reverse it drops on idle. And then a randon idle surge while at the light.

funkgab

i can swear i had the answer, hows your 02 sensor? i think its your icv or ic sensor

CALIFORNIAICE

I sure do hope so.. O2 sensor is brand new with an OEM part. IAC location pls? one last thing i'm going to try before taking to an official Mercedes shop.

chlippo

you still didnt try what i suggested....pretty sure it will be it.

Its very easy and u dont need any parts...and it cant go wrong...worst case scenario u turn it back to its initial position.

If i recall you have to turn in around 10 degree (very little) clockwise

CALIFORNIAICE

Funkgab, iac ordered.. im picking it up on Monday, and give you guys an update in that. Hopefully its it!

Chlippo, when i took it to certified mercedes mechanics i informed them about that. It turns out the previous mechanic adjusted it to be lean, which helped out the idle issue a bit. Mercedes mechanic adjusted to spec, and idle is worse... but it tells me that its not the issue. Hoping its the iac.

Thanks guys for all the help! What are the chances its the oil pressure sender?

funkgab

don't forget to clean your icv while your at it btw!

CALIFORNIAICE

mechanically declined alert: The iac. And icv are 2 different parts?

funkgab

different for the m103, and the m104.

rayhennig

The Idle Control Valve on the M103 is the same as that on my M104. Same part number on one I got from a 300TE 4-Matic as the one on my 300CE-24.

Hope that helps.

RayH

CALIFORNIAICE

I'm a little confused guys.. is the "iac" and the "icv" the same exact part? Or does my m103 have the an iac and a icv?

rayhennig

Er, sorry, I don't know what an 'iac' is. The ICV, or Idle Control Valve, is what I'm on about. The ICV is an electrically operated valve that lets metered quantities of air into the inlet, past the butterfly valve, in order to smooth out idling irregularities. It is connected into the system by flexible hoses and the one on the 'manifold' side of the ICV, if it leaks, causes unmetered air to enter the engine and this upsets lots of things that rely on accurate measurements of vacuum depression.

RayH

CALIFORNIAICE

Thanks Ray!! I just purchased the ICV, and picked it up today. not sure if this is it.. I SURE DO HOPE SO!!