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Old 05-13-2014, 06:53 AM
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M103 Manual Swap: Any ECU problems or is it old enough?

Hi everyone,

I've finally collected most the parts needed for my manual conversion.

Just waiting on my flywheel to come in & a clutch kit & i'll be ready to start swapping.

However my buddys have been getting be cautious about ECU problems when it's done. Obviously because of Auto to Manual.

I have been researching, and found information that states OLDER MODELS DON'T NEED ECU CHANGE apparently they already have the "fuel mapping" the engine needs to function with the manual box.

Makes sense, I guess.

The information I got was for a 1992 M103,

My model is 1990 M103.

Will the same apply to me and my ECU just work with the swap?

Any relative info is appreciated,

Thanks
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  #2  
Old 05-13-2014, 12:50 PM
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MTI MTI is offline
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The CIS Control Unit and EZL Ignition Control Unit are the same for manual and auto transmissions, however the Fuel Pump Relay, AC Compressor Relay, Cruise Control Coder and EGR (Speed Control Switch) are transmission specific.
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Old 05-14-2014, 02:56 PM
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The 722 that came out is totally mechanical, your ECU is unaware of what is bolted to the back of the motor.
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Old 05-15-2014, 05:58 PM
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as far as I know the only changes to the engine are removing the kickdown cable and plugging (capping) the modulator vacuum port. Benz being Benz, lots of stuff is different....engine mounts for one. I never noticed any change, assume that difference is slight difference of the damping rate. The switch on the clutch pedal is for cruise control. on my 87 there was no starter interlock. Keep us informed, I'l be doing an M104 conversion soon, interested in how the upshift delay will react when disconnected/plugged.
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