Quote:
Originally Posted by w123fanman
I believe this could be bad on my car, just haven't gotten around to pulling the instrument cluster. I have the sensor from my parts car that I believe was good sitting on my workbench waiting to go in. Car idles like crap.
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In my experience I (think I) have learnt the following.
Electrickery =>
1) You need a "clean" power source - that means no leaky diodes on your alternator
2) You need a good OVP
3) The air idle control valve needs to be clean and to operate properly
4) The temperature senders are important
5) The O2 sensor needs to send a reliable signal
6) The pulses from the rear crankshaft sensor are important not only for the spark in the plugs but the CIS too
7) The air flow potentiometer is a big wear problem! (
CIS air flow potentiometer possible fix?)
8) The hydro-electric actuator is a twat
9) New plugs leads and cap are a must
Fuel =>
1) Fuel pressures are a bugger to measure because of the silly sized unions used by Mercedes - a dedicated kit is expensive
2) Injectors don't last forever!
3) The plunger for the fuel distributor can stick
4) If the electro-hydraulic actuator leaks then there's trouble - but it is only two little (thicker than normal!) O rings
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In your case I'd start by looking at the air flow sensor tracks and perhaps change the O2 sensor.
The problem I have is a good steady idle for most of the time but occasional drop of death (usually on a round about so the power steering dies too!)