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Old 10-01-2021, 02:56 AM   #1
Virgis007
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Bmw E46 problems. (n42b20a)

Hello guys!

What could be the problem? Why could only one ignition coil give out spark, the other three are not giving spark? Could all of the three ignition coils fail at a time? Maybe it is the ECM problem? What other components to test out? Need ideas. Spark plugs changed to new, same problem..
As you crank the engine it is trying to start but very hardly, as only one coil is working.
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Trabant 601 1983; 1987,
Lada (VAZ) 2101 1972,
Bmw E28 518i; 520i 1984; 1986,
Audi 80 B2 1.6(carb) 1984,
Pontiac Trans Sport 3.8 1993.
Jawa motorcycles 1958-1990,
KMZ M-72 1956.
Thanks, no more projects, until dealing with those above....
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Old 10-02-2021, 02:59 AM   #2
Virgis007
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Re: Bmw E46 problems. (n42b20a)

Solved the problem...

The cause was the "midi fuses" behind the normal fuses. The midi fuses are deeper in the glove box compartment, you have to remove the whole glove box, to reach those. Oxidation on the midi fuses caused bad contact, cleaned lubed with spec. Electronics lube to prevent oxidation. Hope this tip helps someone out there some time!
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Trabant 601 1983; 1987,
Lada (VAZ) 2101 1972,
Bmw E28 518i; 520i 1984; 1986,
Audi 80 B2 1.6(carb) 1984,
Pontiac Trans Sport 3.8 1993.
Jawa motorcycles 1958-1990,
KMZ M-72 1956.
Thanks, no more projects, until dealing with those above....

Last edited by Virgis007; 10-02-2021 at 03:00 AM. Reason: Spelling
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