1989 260E.
when fully warmed-up, my car idles at 400/500RPM while transmission is engaged. In neutral, idle will creep to 600/700RPM.
This problem has bee persistant for over a year.
I recently had the following done:
valve guides, seals, full tune-up (cap, rotor, wires, spark plugs etc, air/fuel filter, injectors, etc. The problem was present before the job was done and did not improve/worsen after it was done.
The engine will sometime quit (because of low idle speed) but will re-start easily, and idle again at 500RPM.
When cold, the engine takes a lot of cranking before starting but will idle at 900RPM when cold.
Any suggestions?? Thanks
JackD