R129 500SL idle control valve issue / problem

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Makdissy

Active Member
Joined
Nov 23, 2014
Messages
83
Location
Staffordshire
Car
Mercedes 320ce
Morning guys, I have a little problem with my 500SL 1992
When I start the car from cold it starts fine with around 800/900 rpm and as the car gets warmer the rpm start to go up and settle around 1200 rpm ( ain’t this suppose to be the other way around ) !!
Took the ICV off and gave it a good clean with a carb cleaner, not much luck there even though it did idle better for a few days and then back to square one 😕
Just bought one on eBay and it’s doing the exact same thing
They are expensive from the dealership, so before I spend £600 on a new one is there anything I need to check or investigate before I waste my money if the problem isn’t the idle value !
Anyone had a similar problem before
All thoughts and tips are welcome
Thanks in advance
 
It isn't a pink car by any chance,is it 😅
 
Is 1992 CIS or EFI? AFAIK, these cars had issues with biodegrable wiring harnesses from around 1992-1995 that caused all kinds of running issues. You might want to peel back the wrap and see what the wires look like.
 

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throttle linkage?
 
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