Hello all,

I've a 190E with the 2.5-16 engine. I've been tracing a very mild but noticeable poor throttle response and flatness low down for a good time now.

Today I unplugged the coolant temperature sensor and plugged in a resistor. This resistor is the correct value to fool the ECU into thinking the engine is at 15 degrees C i.e. stone cold. The interesting thing is how it drives when I do this. The response and power down low is better (under 3000 rpm), very noticeably. Unfortunately over 3000 rpm it's way off and completely lacking in acceleration, it bucks and jumps when you back off the throttle too.

I think that the resistor trick is richening the mixture up? Therefore my engine must naturally be lean at low revs and/or rich at high revs, right? The mixture is adjusted to be correct at idle when I'm not messing with my trick resistor but obviously this doesn't mean it's right when you're on the throttle...

Opinions?

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg