You're right on Fred... most likely an issue with the idle control. The idle valve looks like this: http://www.autohausaz.com/secure/PartImages/0001411225.jpg
Take a look at it and all the rubber hoses that connect it. Anything dried or up cracked should be replaced. Most likely, it all needs to be replaced, along with all the rubber vacuum line fittings. This is a good place to start and might cure lots of running issues with the car. The parts are not too expensive and you just replace each part one at a time to avoid mixing things up. Note that the vacuum line arrangements are different from model year to model year, so if you get a diagram, make sure its for a 1985 US model car only. I believe if you remove the idle valve and rotate it back and forth in your hand, you should hear the valve inside open and close. You can try cleaning it out with your favorite spray stuff and see if it helps. My experience is that it doesn't work for long if you do clean it. There is a controller for the idle valve, but I'm not too familiar with the specifics. The factory service CD will be very helpful to you in diagnosing this one. Jaime On Fri, Sep 24, 2010 at 2:36 PM, Frederick W Moir <fred.s...@verizon.net> wrote: > D'head. > Air leak, or stuck idle control motor? > I know nada about the 380SL's fuel system. > Fred Moir > Lynn MA > Diesel preferred. > > On 9/24/2010 1:27 PM, Dieselhead wrote: >> >> this car seems to idle very high when it is in neutral. It is like the >> high idle never goes to normal idle. When you start the engine, it goes to >> about 2000 rpm and stays there. When you put it into D or R, the engine >> slows enough to be ok. I did not check the tach, but I would say 750 to >> 1000. as soon as you take it out of gear, the RPMS go up to 2000. >> Thoroughly warmed up engine... >> >> I think I heard once that this is an electric problem to do with one or >> two relays. Can anyone point me to the right relays? >> >> No, blipping the throttle does not get it off the high idle. EVER. TIA >> >> Still 85 380SL >> >> _______________________________________ >> http://www.okiebenz.com >> For new and used parts go to www.okiebenz.com >> To search list archives http://www.okiebenz.com/archive/ >> >> To Unsubscribe or change delivery options go to: >> http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >> >> > > _______________________________________ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
