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e34 525i

 
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sktfourlif



Joined: 05 Oct 2009
Posts: 6

PostPosted: Fri Oct 16, 2009 10:33 am    Post subject: e34 525i Reply with quote

1991, 1993 m50b25tu vanos engine.
There is a misfire. The car isnt over heating. its has been running rough since i havent changed my O2 sensor. The O2 sensor arrived in the mail yesterday and i was supposed to install it today.But for some reason this random misfire started to happening last night. is it possibly because my spark plug is foul or coil is fouled up?? or could it be a faulty injector??
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edjack



Joined: 04 Feb 2002
Posts: 3887
Location: San Jose, CA

PostPosted: Fri Oct 16, 2009 5:08 pm    Post subject: Reply with quote

You mentioned two MYs. Which is it?

Have you read any codes?

How many miles on spark plugs? Remove and inspect.

Inspect the spark plug wells for a pool of oil.

O2 sensor would not cause a misfire.
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Ed BMW CCA member since 1987 (Nr. 62319).
'97 540i 6 speed Aspensilber over Aubergine interior.
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