E30 M50B25 problem *SOLVED*

[Jay_L]

Hello guys! At first I'd like you to know that im from Finland and my english might not be as good as your's but i hope that you would understand something.

The problem is this : http://www.youtube.com/watch?v=Wep3-1lM--M

You can hear the rpm's humping or something like that.

The previus owner had put the fuel tank and pump in to the trunk.

Things I have checked/repaired/changed:

New Bosch Lambda
MAF that has been taken from a working car
NGK BKR6EK Spark plugs
Vacuum hoses etc.
Ignition coils
Crankshaft position sensor
Intake manifold gaskets
Fuel filter

I'm running out of ideas what might be causing this problem.

[burlmays9]

Unplug your MAF: PROFIT.

[Jay_L]

I have tried it several times with both, the new and the old MAF. Engine starts running worse than in the video.
I opened the Motronic box and found out that there was some corrosion on the electric parts.
I tried to clean it and let it dry for over night and today I'm going to try if it worked.

Edit: It worked!! I cleaned the motronic electronics from the corrosion and it works!