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General E46 Forum
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Old 08-06-2009, 12:52 AM   #1
dh0licious
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What is a misfire / mis-fire ?

Preface: I am going to include multiple ways to spell key words in all titles of threads that I start from now on - makes it much easier to search and find what people are looking for without having to enter multiple search strings (and waiting 15s each time).

Onto the topic. What is a mis-fire and what does it feel like? How do I know if I am misfiring? What are common causes for it? I am reading alot about them lately and have no idea what you all are talking about.

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Old 08-06-2009, 12:58 AM   #2
Len013091
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I misfire occurs when a cylinder fails to produce an adequate combustion. If your engine is misfiring, it will likely throw a P0300 code at the very least. a misfire feels like the engine skips a beat, you'll be able to hear it in the exhaust tone as well as feel the vibrations. Misfires can be caused by 4 main sources: no/weak spark, incorrect fuel mixture, incorrect timing, and low compression.
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Old 08-06-2009, 12:59 AM   #3
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Just a tip as far as the title goes... you don't need to put two spelling in the title. If you look at the bottom of the thread there is a thing labeled "Tags" that you can add all you want to in order to help search results.
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Old 08-06-2009, 06:35 AM   #4
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Misfire equals CEL...

Skipping a beat is a good way to describe it.
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Old 08-06-2009, 08:15 AM   #5
GoingNuts
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Originally Posted by dh0licious View Post
How do I know if I am misfiring?
If you are misfiring, I imagine your belly would be making some strange and unexpected noises. The engine does something similar.

Last edited by GoingNuts; 08-06-2009 at 08:23 AM.
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Old 08-06-2009, 09:43 AM   #6
dh0licious
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If you are misfiring, I imagine your belly would be making some strange and unexpected noises. The engine does something similar.
Would you say maybe that my engine feels like it's... GoingNuts?
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Old 08-06-2009, 09:46 AM   #7
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Would you say maybe that my engine feels like it's... GoingNuts?
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