[W126 Coupe] Slightly High Idle - Possible Causes

[Dick Spellman]

Hi John:

What year is the SEC?

Dick

JohnJayKimrey1 at aol.com wrote:

> Dick,

> I replaced the over voltage protection relay previously because it 

> started giving me a 1100 rpm idle problem and ABS light on . I would 

> tap the old one and idle would drop but only to 850 rpm.I still have 

> idle at 850.The idle is absolutely steady at 850 no wavering. It is 

> almost like the timing is set too far after TDC but this seems 

> incorrect as timing is done electronically. I do have a concern about 

> the cold start sensor because at start up the engine seems to be at 

> 850 whether cold(start up) or hot-no drop off of rpm during warm up 

> but would this still give me a high idle after coming up to temp? Is 

> there a way to test this sensor? Also,I only checked the fuel 

> distributor valve to make sure it wasn't sticking. I did not remove it 

> as I read the precaution note in the spec. I am willing to do certain 

> things and some things I don't touch. The Idle control unit is under 

> the passenger floor panel and I thought this was a sealed unit.

> Regards,

> John K.

>

>

>

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