M50B25 from e34 to e30 problem - BMW Forum - BimmerWerkz.com
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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#1 (permalink) Old 07-19-2007, 02:57 AM
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M50B25 from e34 to e30 problem

I came here in hope that you nice people might help me.

I've done a engine swap, M50B25 from E34 to E30.

I had 2 engines M50B25 to make 1 good engine.

Now, swap is done, but engine runs on 3 cylinders.

When i switch off Luftmassemeser (MAF) engine runs twitchy but when i rev it it runs on 6 cylinders.

I tried to put LMM, Lerluft ventil and ECU from friends car that runs OK,
but the same thing is happening.

Is it possible that one of the engines that i took the LMM and ECU have a Bosch, and this one in the car had Siemens electronic and wires layout?

Or you think it might be something else?

E30 that i build is for drifting.

Thank you,
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#2 (permalink) Old 07-30-2007, 12:43 PM
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How did the engine run before it was pulled from the E34? Did you do a cylinder leak down test to make sure the engine was in good condition before it was installed into the E30?

If the engine ran well before it was pulled check the grounds for the coil packs. Make sure there is no dirt, oil or paint between the grounding surfaces. Also check the spark plugs and make sure they arn't platinum. Plat. plugs tend to foul out very easy on the older engines, I recomend using the factory Bosch plugs.
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