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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 05-30-2012, 04:34 PM   #1
zhenkaaaM3
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Intake boot?

Would this cause a cylinder misfire 1-6?(boot after MAF) I cannot feel any poor drivability. But I do get the cylinder misfires 1-6 as well as mixture too rich.
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Old 05-30-2012, 04:40 PM   #2
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That's a huge rip, Eugene. It certainly could cause a misfire. As far as it being too rich, I can only guess that the 02 sensors are seeing it as lean and then dumping a lot of extra gas in to compensate, but as it isn't getting an accurate reading of air from the maf (because of the rip), it's just guessing.

You could disconnect the maf until you fix that boot...which you should do right away.
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Old 05-30-2012, 04:42 PM   #3
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Mixture too rich, yes. I suppose it could theoretically cause misfires as well, as it's bringing in a ton of unmetered air. Though it's a moot point, as it needs to be replaced no matter what.

Also look at the 2nd boot under that one. It has a small extension that feeds into the ICV and that's known to crack and leak as well. It would probably be wise to replace them both while you're in there.

You'll need a small 6mm socket and a small ratchet with either a flex head or a wobble extension on it. The clamps on the lower boot are in a tight area.
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Old 05-30-2012, 05:21 PM   #4
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The lower intake boot seems fine to me. Dusty as hell, but still looks good.

Yea, the rip is pretty big. The MAF is trying to work, while the boot, I assume, is messing up the mixture. I taped the hell out of that part of the boot so no air can come out as a temporary. I want to see if I still will get misfires.
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Old 05-30-2012, 08:42 PM   #5
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get it fixed as soon as possible.
what made you think its okay? of course its not okay duh.
running engine lean will burn your valves very soon.
replace it as soon as possible.
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Old 05-30-2012, 08:44 PM   #6
zhenkaaaM3
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Quote:
Originally Posted by jasonbimmer View Post
get it fixed as soon as possible.
what made you think its okay? of course its not okay duh.
running engine lean will burn your valves very soon.
replace it as soon as possible.
would this big rip be the cause of the original post?

I taped it right away. No air can get out now. New boot coming in the mail. I ordered today.
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Old 05-30-2012, 08:47 PM   #7
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would this big rip be the cause of the original post?

I taped it right away. No air can get out now. New boot coming in the mail. I ordered today.
what do you think? of course unmetered air would cause engine to run lean and misfire.
go to the dealer and grab one would be the fastest (sometimes cheaper cuz shipping).
FYI on the intake, air gets IN not OUT.
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Old 05-30-2012, 09:25 PM   #8
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Not good, will cause misfires and other problems.

DMax & Jason know the drill!

See the first link in my signature below, you may find something useful in the link?

Suggest if your upper boot is this bad, your lower boot is not far behind!
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

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Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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Old 05-30-2012, 09:37 PM   #9
zhenkaaaM3
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I think the way the upper boot had a lot of stress on it because of the way it was mounted on the MAF, it caused it to rip. I wont be driving the car till I get the part. But like I said, I taped up the big opening. As ghetto as the seems, I do believe it will prevent any air from coming out.

jfoj, you were the one I was looking for when I was trying to find misfires. Very useful thread it may be. I hope this intake boot is the cause to all of these codes that Im getting.

Id love to go to dealer. Sadly, I work almost everyday and a bmw dealer is in jersey only. I ordered from ecs tuning already.

Last edited by zhenkaaaM3; 05-30-2012 at 09:39 PM.
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