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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 07-22-2004, 05:04 AM   #1 (permalink)
Join Date: Jul 2004
Posts: 4
dnkx is an unknown quantity at this point
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!!!!!

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Old 07-23-2004, 04:28 PM   #2 (permalink)
Join Date: Jan 2004
Posts: 17
toffa182 is an unknown quantity at this point
1. yes it is possible.

2. i would take an extra look at the ignition part. check the ignition order again.(although you might think you have it right). it should be 1-5-3-6-2-4. check EVERYTHING that has anything to do with ignition.
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