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Before you trash the AMM... 200 1993

posted by  someone claiming to be Roger on  Mon Feb 7 00:50 CST 2005 [RELATED]

I see, it's the "limp home" mode default that works.

I think my AMM might be making the engine run too rich because I get a lot of black smoke and black sooty deposits coming out the tailpipe, like unburned fuel. This stops when the engine warms up. An AMM that was not allowing enough air could make it run rich, but so would a sticky cold-start injector, but I can't seem to find a cold-start injector on my 1993 240. They were obvious on the 140s and early 240s but I don't see one on mine. Has the cold start injector been replaced with a computer/sensor enriching of the fuel-air ratio instead? If so, I wonder what could be making it run rich when cold other than the AMM. Once I get it started and warmed up it runs fine, even with the AMM plugged in. It's only the cold starting that is a problem. I unplug the AMM and it starts, run roughly, warms up, then I can plug the AMM back in and it runs as smooth as it ever did.

I am also woriking with the suggestion that there might be water in my gas freezing in a fuel line and I have been running gas dryer and injector cleaner through it, just letting it sit and burn gas for hours at a time to get this possibly contaminated gas out of it. That's when I noticed the black sooty deposits all over the rear of the car and under the exhaust pipe on the ground.

Maybe I have water in the gas and an unreliable AMM. Possible?

Roger






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