| i just replaced the engine in my 89 facelift 3 series with one from a pre facelift car (about an 87 motor) and the dam thing wont start!!!!
the car has a motronic ecu with the distributor on the frount of the camshaft and the computer controlled ignition etc.
the "new" motor is one of the earlier m20's with the distributor in the left side of the block above the oil pump drive. i think these are l-jetronic ecu's????
anywho... i replaced all of the electronic sensors etc on the replacement motor with those from the cars engine, along with relocating the distributor to the camshaft drive and so on.
in theory the replacement motr should now be a motronic spec one which STARTS... but it doesnt its back fireing and generally behaving like its got a problem with the ignition timings out, or the leads being 180 degrees out.
the engines got fuel and spark and all of the sensors are plugged in
...SO firstly, is it possible to simply replace all the electronics and applicable parts on an early l-jetronic m20 with those from a later motronic variant?
secondly aybody got a gun... or some ideas re whats the likely fault?
i tried the old stamp your foot on the gas pedal 5 times trick to check for ecu faults and nothing happened, so i did it agian and nothing happened, and now im thanking my lucky stars i aint a girl in OZ called Dorathy who thinks clicking her heels will get her back to kansas!!!!!
thanks | 
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