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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 10-16-2013, 11:27 AM   #1
CeeBoogie
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Join Date: Dec 2004
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Rattling and misfire issues

I have had this problem for a few weeks and just began to finally investigate it. At first, my car was misfiring like crazy, so I changed all 6 spark plugs. Everything was fine for about 5-10 minutes then the misfires began again. Not to long after that I start hearing a clanking rattling noise. At first it sounds like it's coming from the crank, by the bottom of the engine. I bring the car to my mechanic and he couldn't look at the car because he had to many other cars so I was growing more frustrated. Finally he's available to look at it and he tells me that it could be the clutch or the flywheel. He then starts to investigate it more and he finds this out. When he turns the car off you can hear the rattle, but when you turn the car off pressing the clutch down there is no rattle. This is wehn he tells me that the flywheel is probably damaged or my transmission might be bad. He asks me if I have any problems with getting into gear which I don't, but I do occasionally pop out of third gear if I'm coasting at low speeds around 3,000 rpm, and this will only happen in third gear. I mentioned to someone else who is familiar with cars and they told me it's my syncro's. So last night while I'm at work sitting in the car while it's idling rough and I hear the clanking noise I press the clutch in and the noise stops. Another friend of mines who is a mechanic told me it might be the throw out bearing, he had a similar situation with a mini cooper. he told me it was making the same noise as my car was. I'm hoping it's that instead of the whole transmission. So I know at least the direction to go with the clanking noise, but the misfires I'm still lost. The mechanic that said it's the transmission looked in his computer and said that the misfires have to do with the vanos, that the exhaust side is bad and he recommends me to get a new vanos. I do not wish to spend money on possibly a transmission and a vanos. I looked into besian systems and I think I just need the vanos solenoid, but he doesn't think so for whatever reason? I'm also thinking maybe I need to get all 6 coil packs? If anyone has a similar problem to what I have any insight on the right direction for me to go in will definitely be appreciated!
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Old 10-16-2013, 11:48 AM   #2
taylor192
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Try the Besian solenoid first before wasting money on replacing the Vanos. It is good maintenance anyways.

Does the clanking noise occur if the car is in neutral?

Keep your responses concise and to the point and you'll get more help. Most will see that huge block of text and just move onto the next post. Plus we don't care about the drama with your busy mechanic and frustration.
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Old 10-16-2013, 11:53 AM   #3
CeeBoogie
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Yeah, it does it in neutral, if I step on the clutch it goes away.
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Old 10-16-2013, 12:22 PM   #4
taylor192
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Originally Posted by CeeBoogie View Post
Yeah, it does it in neutral, if I step on the clutch it goes away.
Then its probably not the transmission or rest of the drivetrain back.

Throw out bearing would rattle with the clutch pedal pushed, thus it is more likely the input shaft bearing. Read this, seems like its an annoying rattle, yet you can drive a long time with the rattle before requiring a trans rebuild.

http://www.e46fanatics.com/forum/sho...d.php?t=788746
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Old 10-16-2013, 03:38 PM   #5
CeeBoogie
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It's the throw out bearing. I just spoke to a buddy of mines who is a bmw tech and explained to him to situation. He told me he was 100% sure it's the throw out bearing. Also told me if it was the transmission then it would still rattle while I push the clutch in. He explained in detail so now I know what to do..... Thanks for your help!!!
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