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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 11-02-2005, 11:34 PM   #1
proboarder3263
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Join Date: Oct 2005
Location: Houston
Posts: 7
My Ride: 2002 M3 SMG
Question about service engine light...

I installed a K@N Air Charger CAI on my 2002 M3 last week. Everything fits great and car runs good. My service engine light came on about two days later and it seems that when I am in 4th gear (SMG) and not accelerating, the car seems to "hiccup"...but just slightly.

Anybody have this happen or anything similar? I am guessing that maybe I need to have it tuned or maybe my MAF is damaged??? I'm not too worried...as the car pulls very hard and I can feel the difference, so it is running solid.

Any advice or help is appreciated.
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Old 11-03-2005, 07:12 PM   #2
ArBrnSnpr
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Join Date: Aug 2005
Location: Portland
Posts: 2,391
My Ride: 02 M3-04 S4-07 GTI
Quote:
Originally Posted by proboarder3263
I installed a K@N Air Charger CAI on my 2002 M3 last week. Everything fits great and car runs good. My service engine light came on about two days later and it seems that when I am in 4th gear (SMG) and not accelerating, the car seems to "hiccup"...but just slightly.

Anybody have this happen or anything similar? I am guessing that maybe I need to have it tuned or maybe my MAF is damaged??? I'm not too worried...as the car pulls very hard and I can feel the difference, so it is running solid.

Any advice or help is appreciated.
I had this happen on a 330ci, and I had a local shop look at it and they told me that sometimes the oil from new filters can get sucked in and a small amount of it can get on the MAF, and cause this to happen. I had the light cleared 5 times before putting my stock air box back on. My service leghts were somthing about too much air in left bank, and too much air in the right bank. I cant remember the exact code though. You might need to have your adaptation values reset, which I believe is a dealer only task?? Hope that helps some.
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Old 11-16-2005, 12:08 AM   #3
Custom3
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Same thing happend to me when i put my cold air intake....turns out it was to much air for the MAF and ruined it....now a bad MAF will in the long run mess up your O2 sensors.....that might be why your feeling that hiccup effect...O2 sensor are problem ruined now cause of driving with a bad MAF sensor....i replaced the MAF and the O2 sensor before the cat and it fixed that hiccup problem.
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