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      02-19-2013, 05:50 PM   #1
WhatADream
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What does a Misfire feel like?

Hey guys, I am running the Cobb tune, with BMS intake and upgraded downpipes.
Lately, under boost, It will feel like a couple hard studders while accelerating. especially in 4th gear. Also while idle, itll be smooth, with an occasional small burp. No codes. WTF is going on?
I ordered new plugs, hope that helps!
Is this common?
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      02-19-2013, 09:02 PM   #2
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From my understanding you can watch the cobb YouTube video or one on their site (http://www.cobbtuning.com/BMW-335i-xi-i-xDrive-s/1200.htm) you should be able to log your car with your cobb and look for a misfire. The video is for replacing.

Just a suggestion before going through the disassembly.
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      02-19-2013, 10:21 PM   #3
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ask you're girl or boyfriend
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      02-19-2013, 10:23 PM   #4
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I believe a misfire is most noted when in idle and the car won't be very smooth at all. So I don't believe its a misfire.. maybe a bad clutch when downshifting to accelerate?
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      02-19-2013, 10:25 PM   #5
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feels like a damn earthquake and usually pops a code. use the cobb to scan for codes and report back.
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      02-20-2013, 08:21 AM   #6
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The car vibrates like hell, you can feel it easily. It usually happens under hard acceleration, it used to happen only when i had the tune on and I pushed the car. The car will hesitate a bit, you might think its a fuel pump issue but no it was my plugs...
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      02-20-2013, 11:36 AM   #7
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Had a similar problem and it turned out to be one of my plugs. When I replaced them one of the electrodes was gone, therefore not making as spark at all. It also threw a misfire code on me. Once I replaced the plugs it didn't come back
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      02-20-2013, 01:21 PM   #8
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Great guys! my plugs arrive today, so I will report back and let you all know. Perhaps Ill take pics of old plugs and new plugs for comparison.
I have about 30k on current plugs. of the 30, perhaps 15 are on the cobb tune.
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      02-20-2013, 01:34 PM   #9
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Yup sounds like new plugs are in need. Report back.
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      02-21-2013, 04:42 PM   #10
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OK guys. PROBLEM solved!! I just installed the new plugs and everything is extremely smooth! I feel like I have recovered some power too. Keep in mind, I also just replaced a failed turbo leaking oil all over the place on the intake and exahust about 1k miles ago. (I used to have to add a quart of oil every 1k miles. So far my oil is still full)
Here are some pics.

New


Old plugs are in line from Cyl 1-6. What do you guys suggest that could have been wrong.



Kind of a bonus pic. Bottom of engine cover... Looks like spongy material that could be insulating heat.
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      02-22-2013, 06:34 AM   #11
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looks like cylinder 1 was running rich, or getting oil in the cylinder. How many miles on the car? You might want to consider cleaning the intake valves i.e. walnut blasting
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      02-22-2013, 02:07 PM   #12
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Quote:
Originally Posted by marine24 View Post
looks like cylinder 1 was running rich, or getting oil in the cylinder. How many miles on the car? You might want to consider cleaning the intake valves i.e. walnut blasting
Yes, I agree. I might get that done soon.
It was for sure getting oil in the cylinder because the turbo was bad and I was losing 1 quart of oil every 1k miles.
Now that is fixed. Hope all stays strong.
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      02-24-2013, 01:52 AM   #13
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at least you plugs didn't look like this when you pulled them out. This was my #6. Notice the electrode is gone
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