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1991 300 SE
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The classic symptom of a failed or faulty ICV is high idle. It is recommended an attempt to clean the valve be made first by a 24 to 48 hour soak in brake or carb cleaner.
 

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Depends on the day!
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Or, you can go this route and pick your own idle:)

Jonathan
 

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It must, I've been driving like that for 15,000+ miles!

Turn it up just a touch for the winter and that's about it:)

Jonathan
 

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2002 CL55 AMG, 1993 190E 2.3L, 2004 SLK320 Sport
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Discussion Starter #6
Your a champ!
I'm going to do this tomorrow.
I'll tell you the outcome......
thanks, Spiros
 

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2002 CL55 AMG, 1993 190E 2.3L, 2004 SLK320 Sport
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Discussion Starter #7
Will my idle always be the same or would it still drop a little when I put it in drive ? Basically, say I use this type of valve and I adjust it to 1000rpm in park, will it drop to 700-750rpm when I shift to drive ?
 

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Your idle dropping isn't a function of the valve, it's the load the transmission puts on the engine that drops the RPM's. I idle right at 700 when in drive.

Only thing I have found is when the car is cold it idles a touch low, around 600-700 in neutral.


Jonathan
 

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Yup and yup...but one of the Fine valves...takes Many turns from full open to close.


Jonathan
 

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Discussion Starter #13
I’m going to try this today! If it works, I’ll buy a new ICV ($400 Cnd.), or I might just wait and get one from Greece while on vacation this Sept. (approx. 80euro/$170 Cnd).
I think I have replaced almost everything now. The ICV is the only part that is original on my car. My idle is always fluctuating, so if this trick works, I know it’s the ICV that’s been giving me problems! I’ll keep everyone posted & thanks to Jonathan !
Spiros
 

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Discussion Starter #14
Wow! This really works. My car's idle is adjusted to 700rpm in drive and 1000 in park or neutral. I still have a little shake, but I know I have to replace the fuel injector seals and adjust the air/fuel mixture.
Thank you Jonathan!(really smart guy!!)
p.s. I bought the same valve as you (Home Depot $3.99) ha ha !!!!!!!!
 

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2002 CL55 AMG, 1993 190E 2.3L, 2004 SLK320 Sport
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Discussion Starter #15
The only bad thing about this is, when you start your car it idles very low(500rpm). You have to wait and rev your car a couple of times before it goes to your adjusted idle.
 

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mine settles down on cold start to 550-600 ish.

Still, this valve will never fail..:)

Jonathan
 

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Nope...I like having conrol over things...:)

Jonathan
 

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Hi Jonathon:

Can that modification be done on a 1995 model?

Currently, when i start the car or have it in P, it idles around 700-1000 rpm, and ironically its lower around 500 rpm when idling in D stopped at red lights/stop sign with brakes on.

What is the normal range for idle? You noted 500 rpm - how long should it takes before coming back down?
 

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1988 300E, 2006 E350 wagon
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124via126 - 5/25/2005 8:43 PM

Hi Jonathon:

Can that modification be done on a 1995 model?

Currently, when i start the car or have it in P, it idles around 700-1000 rpm, and ironically its lower around 500 rpm when idling in D stopped at red lights/stop sign with brakes on.

What is the normal range for idle? You noted 500 rpm - how long should it takes before coming back down?
As Jonathan previously stated: "Your idle dropping isn't a function of the valve, it's the load the transmission puts on the engine that drops the RPM's."
There is no irony here.
 
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