MBENZ300SD
Posts: 20
Joined: 12/25/2007
Status: offline
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if you still have the high idle problem I might be able to help, first of all, is the SRS or ABS light on when the engine is running, if so then check the overload protection relay. it is located next to the fuel pump relay and klima control relay under the hood, near the left side of the brake booster, it has a red top with a clear lid, there is a 10 amp fuse on top of the relay, if it is blown it will cause the engine to idle high, if the fuse is not blown then the idle control relay under the passenger side carpet foot rest area is at fault, remove carpet to gain access to the black panel, there is a 10mm nut that holds the panel in place, the idle control relay will be there,,,,,, or the idle control valve is at fault, located on top of engine dead center in front of the air cleaner, with engine running, you should be able to feel the valve working, it is round with 2 wires on the very end and 2 vac hoses, check with volt meter, you should also check for any vac leaks as well, my 1989 560SEL starts within 2 seconds, idles at 1,500rpm for about 5 seconds at cold then drops down to 700+/- in park, 650rpm in Drive and thats with 231K miles so yours should do somewhat the same as mine does, hope that helps you out. good luck
< Message edited by MBENZ300SD -- 8/18/2008 7:44:06 PM >
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Printable Version
Idles High!!! - 
