Quote:
Originally Posted by gsxr
Can't do it. The systems have logic built in to compare the two values. If they are significantly different, the computers assume a faulty sensor, and will use the higher of the two values.
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This isn't right (if we're talking about a KE sytem). There's 2 sensors because one goes to the injection and one goes to the ignition. You can fool them separately. But the ignition and injection do not communicate and compare values. What you are referring to is the comparison the injection ECU (and as far as I assume the ignition ECU?) does against the current value and the previous value from, say, a few moments earlier. If it varies wildly then the system knows the sensor has become shorted, disconnected, or is basically faulty. Because it knows a temp reading would never change so fast it knows the sensor is faulty. I'm not aware it compares the 2 coolant temperature sensor readings to diagnose a fault (though being Mercedes it would seem sensible)
I believe Jay is right about the standard 6 degrees retard - it's documented pretty well on the infamous 'free hp for w124/w201 owners' thread. What's also documented well though is mixed results (in terms of noticeability) when it comes to returning it to 0 retard.