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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > What noise is my engine making? VIDEO ATTACHED



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      03-09-2014, 07:30 PM   #1
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What noise is my engine making? VIDEO ATTACHED

I have a knocking noise coming from my engine. As I accelerate, the knocking picks up speed and tempo. When I engage the clutch the noise goes away. I have no engine lights on and the car operates as it should. Can anyone identify the noise and the consequences?


2006 325i, manual transmission

*It is not the famous lifter tick

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      03-10-2014, 10:49 PM   #2
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bump
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      03-11-2014, 10:55 PM   #3
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If the noise stops when you engage the clutch (and rpm's are still high), then the problem is not your engine, it's the transmission. Do you feel a vibration? I would guess that you might have a ball bearing inside your transmission that's messed up.
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      03-12-2014, 05:23 PM   #4
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Had the exact same problem on my 2006 330i. And your not going to like my answer. It is the dual mass flywheel, and it's bad. When you engage the clutch, you stop the flywheel/clutch assembly from spinning, it doesn't make the noise. When mine went they pulled the inspection cover from the bell housing and looked inside. There was a bunch of grease flung around inside. The dual mass flywheel is packed with it, and when it let go, it spun most of the grease out of it. I wouldn't recommend driving it that way for very long, the vibration will get worse and could put stress on your crank bearings and cause a bigger problem. a new flywheel is a $1000 part from BMW, and while they are down there, you might as well get a clutch at the same time. I think it cost me around $2300 to get it all fixed at my mechanics, and the dealer wanted about. $3500. Good luck, and I really hope I'm totally wrong and it's a cheap fix.
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      03-18-2014, 10:02 AM   #5
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So what was it?
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      03-24-2014, 10:51 PM   #6
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Goes in the shop tomorrow. Will keep everyone posted. Mechanic is thinking TOB, input shaft bearing at worst. We'll see
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      03-30-2014, 01:08 PM   #7
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First time I took my car to stealership, they charged me $750 to change my disa valve. Waste of money. So what was the problem ?
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      04-01-2014, 08:15 PM   #8
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Tranny. Replaced flywheel and clutch, which was shot anyways, but didn't solve the problem. ($1,638.**) Now getting used tranny (86k w/1 yr warranty). Total job 2 weeks, $3500. Fingers crossed
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      04-10-2014, 03:39 PM   #9
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Good to go. It was worth it since the car is paid off and in great condition despite the high mileage.
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