I recently had the water pump and timing chain on my 1979 450SL replaced. Previously when the car was at operating temperature, it would idle @750 RPM. Now it idles @550 RPM when warm. Is this normal? Should I adjust the idle back to 750 RPM?
Very possible.Djenka018 said:Your car shoud be K-Jetronik (CIS)
Maybe when pump was replaced mistakenly someone turned the idle screw.
That could happen.Djenka018}Maybe if parts of idle control were removed for w/pump replacement debris fell in and now aperture is smaller = less rpm.[/quote said:Less likely, still possible.
Maybe warmup idle regulator parts were cleaned (on the top of the pump) and now bimetal operation is more free. If this is the case, after adjusting idle your warmup rpm's will be lower.
Check everthing.Djenka018 said:After you adjust idle back to recommended, check CO2 levels. They are somewhat connected.
Cause we won't remember that the first question included your car details.Djenka018 said:It's a good idea to fill in your profile with car details so that it is easier to get answear in the future
Is there any to take overfill out without a spanner or such tools? Something like to suck it out trough same pipe it came down or...?ussun said:Thats funny, but another little thing about the idle in gear I found with everything fine tuned I still and a little problem in D. What cured it was taking out about a 1/3 qt. of over fill from the transmission fl. Cured on first start afterwards.