Missfire 1991 E34 520i M50 - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 06-18-2009, 05:54 AM
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Missfire 1991 E34 520i M50

Hello i have put this on another post of mine but i thought it would be better on its own.

when i push the throttle down pretty hard and fast it misses and backfires like it is running on 5 or something then when it gets to 3k rpm it is ok
Also if i slowly press the accelerator about 30% of the way down it is ok and does not miss or backfire

i have changed the plugs, o2 sensor, new fuel filter and had code reader on it and nothing on the code reader except 0000

anyone got any ideas
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#2 (permalink) Old 06-23-2009, 03:33 AM
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I have had a look at my engine and it looks like a small pipe that come from the top of the engine PCV i think is split

would this cause the problem

and 3 of the 6 spark plugs are Black like is is running rich
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#3 (permalink) Old 06-23-2009, 05:39 AM
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Quote:
Originally Posted by rbooth View Post
I have had a look at my engine and it looks like a small pipe that come from the top of the engine PCV i think is split

would this cause the problem

and 3 of the 6 spark plugs are Black like is is running rich
Yes it would cause this, any leak in the vaccum system will cause a misfire.

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#4 (permalink) Old 06-23-2009, 10:30 AM
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i hope it is the cause becuase i love the car the sound it makes is amazing
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#5 (permalink) Old 07-16-2009, 11:46 PM
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Rbooth,

did you get your problem solved?

Cheers/dom
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#6 (permalink) Old 07-20-2009, 03:43 AM
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No i still have the problem i have given up now.
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