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Old 05-14-2009, 03:17 PM
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land sea air land sea air is offline
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Join Date: Oct 2005
Location: Gaithersburg Maryland
Posts: 201
Exclamation 500SE stumbles/misses heavily at 1500-2000 RPM

Hello all, 86 500SE euro. I have had this problem since I bought the car, between 1500 and 2000 RPM under light to moderate load the car misses heavily with popping from the exhaust. Under heavier loads (not necessarily full acceleration) it runs great but unfortunately 2k rpm is where the car wants to run at highway speeds (55-65mph) so often times I have to leave the car in 3rd gear to alleviate the problem or speed more than I'm comfortable. This is one of the only things keeping me from fully enjoying the car so any help would be much appreciated!

cap and rotor are not new (I have ordered them in the hope that that was the problem) but they look perfectly fine.
replaced plugs and wires last year which didn't fix the problem.
the car has EZL ECE for adjusting timing for different fuel types, I run 93 in the car but having the resistor set for 89 or 87 seems to lessen the problem which makes me think it's ignition related rather than fuel.
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