Hey guys,
Have an interesting problem with my 1988 300CE m103 idle.
it starts fine and idles around 1000 to 900 rpm in park when cold.
BUT...when fully warm the idle goes down to around 600 in park and 500 in drive
drives ok and idles nicely in drive but if i shift it back to park or neutral the idle stays around 500 as if nothings changed! (lots of shuddering and lumpy idle)
I have changed all the vacume lines including the boot for the air flow meter,
have tried a couple of well cleaned ICV valves (new vacume lines) the cap rotor and wires are around 2 years old. the coil is brand new. Temp sensor is brand new.
have checked the OVP relay and since cold start is fine i assume its ok.
Crank shaft sensor gives me a reading of 947ohms which is within range.
I'm at a complete loss as to what is causing the problem. Any ideas?
Thanks in advance.