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1978 530I Engine Misfire at Startup

 
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davidhur



Joined: 28 Jun 2005
Posts: 5
Location: Boise, ID

PostPosted: Tue Oct 20, 2009 1:48 pm    Post subject: 1978 530I Engine Misfire at Startup Reply with quote

I've noticed recent momentary misfiring on cold startup of my BMW. It sounds like one cylinder not firing and usually resolves within 20 seconds. I removed all the plugs that showed normal looking but excessive deposits perhaps due to ethanol here in Idaho, then cleaned, regapped and reinstalled them. The misfire disappeared for 4 days and has recurred. These plugs plus points and distributor cap have 8 thousand miles since installation. I'd appreciate guidance on what's my next step.
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alexgraf



Joined: 17 May 2002
Posts: 319
Location: Michigan, USA

PostPosted: Tue Oct 27, 2009 9:10 pm    Post subject: Reply with quote

Are you sure you do not have water in one cylinder? Stop the car before the idling is regular (say 10 secs) and inspect the plugs.
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edjack



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

PostPosted: Tue Oct 27, 2009 10:45 pm    Post subject: Reply with quote

What kind of "excessive deposits"? Ethanol doesn't cause deposits.

What are the compression readings? How much oil do you use between changes?

When did you last replace the spark plug wires?
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'97 540i 6 speed Aspensilber over Aubergine interior.
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