How can I code an ECM (ECU) on my 1994 Mercedes S320

[zdzich]

A few weeks ago I bought a 1994 Mercedes S320 without ASR. Throttle body (http://mercedesforum.com/forum/#) is mechanical and it has only electronic cruise control. Car has some problems with the engine. It runs only on low rpm up to about 1500. Runs rough, idle rpm fluctuates. I used Carsoft 7.4 and after reading the HFM-SFI module, part number (http://mercedesforum.com/forum/#) 0155457432, I found that it is not coded. How can I code the module without having access to STAR system ? Engine produces some blue smoke. I replaced valve stem seals, spark plugs, timing chain guides. Timing chain was installed as it says in the service manual (http://mercedesforum.com/forum/#) and is right on the points. I drained the gas tank and put 5gal of good 91 octane fuel from Chevron. All electric connections with the ECM have been checked for shorts and continuity. Compression in all 6 cylinders (http://mercedesforum.com/forum/#) is 195 PSI.

Additional faults:
9 air mass flow meter: implausibly high
12 idle speed contact: implausibly large
90 camshaft timing actuator: open circuit/short circuit to ground
91 EGR switchover valve: short circuit to 12V
113 HFM-SFI control module (http://mercedesforum.com/forum/#): is not coded

Your feedback will be appreciated. Thanks

[mercis]

find ecu parts number on epc go to fussnote and find coding nr

[zdzich]

Thanks, I did but I don't have the handheld Mercedes tester to do it. Besides, how is it possible that the ECM is uncoded ? Would the engine run normally with uncoded ECM ? Like I explained in my thread I bought the car with this ECM in it. Is it possible that the ECM lost by itself the coding ?