Help! Normal idle when Cold/ High idle when Hot

[VicsBenz]

My '88 190e/2.3 idles at about 800 - 1000rpm after a cold start but once it warms up it won't drop below 1700rpm. In fact, it likes to race up to 2200 - 2500 rpm while in neutral but I hit the accelerator quickly to make it drop to 1700rpm.

Any ideas? Is this due to a faulty idle control valve? Would a faulty OVP relay cause the same behavior?


Heeellllp!!

[jdc1244]

I would say the idle control valve/unit – the bane of all eighties Mercedes with CIS e fuel systems. [:(] I had the same problem and a new valve and unit fixed it right up – hope this helps![:)]

[VicsBenz]

Thanks jdc1244, I'll give it a try.

[VicsBenz]

JDC,

Thanks for the reply. Sorry for the delayed response, I've not had access to my computer. Anyway, I'll give that a try.

Thanks,

Victor

[jdc1244]

You’ve still been suffering with the problem for almost three months…[:0][V]

[mykg4orce]

how much does it cost to fix this kind of problem....my 190E 2.6 idles at 2000 RPM.

[jdc1244]

That’s insanely high – it cost me less than $400 to fix.

[89_190e_2.6]

[?]Most probable cause ovp relay located behind battery compartment...[high idle problems, abs light on, etc.]

Going rate for an ovp relay @110 us dollars

[VicsBenz]

Well, after seeing how much the Idle Control Valve cost for my '88 190e ($200+) I opted to try the OVP relay first ($70).

That really helped other problems but not the high idle. Alas, I found a place in Chicago called Ideal Auto run by a guy named Alex. I just ordered a used Idle Control Valve from him at a mere $35. I know, you get what you pay for, but I couldn't resist. I've bought parts from him before with no problem so I think the risk is minimal.

He ships fast so I expect to receive it within the next couple of days and will let you know if it does the trick.

[mykg4orce]

could you guys tell me where the idle control valve is? On this picture?