Clicking sound during acceleration - United Bimmer Community

**mrkbik** · 09-07-2006, 01:26 PM

Hey all, I have been noticing lately that when I accelerate from a stop, I hear a little clicking sound. When I let off the gas it stops. To me, this sounds like an exhaust-related problem, because the sound is coming from behind me, and is louder when I have the windows open. Has anyone experienced this before?

**Rooz** · 09-07-2006, 06:32 PM

maybe cats going bad

**3050rpm** · 09-07-2006, 09:52 PM

Could be a heat shield or other piece of protective metal coming undone, not at all uncommon, generally benign. When I flushed my cooling system a few months back I found a loose piece of disconnected something-or-other, looked like some sort of bracket, nestled by the engine block. Best to get under the car and take a look at all the protective shielding, as well as any clamps that may have come undone, especially if attached to or supporting the exhaust. You may have to improvise a bit if you want to reattach or resecure any loose pieces, chances are the nuts or studs have snapped off.

**mrkbik** · 09-08-2006, 03:11 PM

Hmm, ok that sounds like it may be the problem. The last couple of days I haven't really noticed it, but I'll take a look at everything anyway.

**Rooz** · 09-08-2006, 09:17 PM

Does it sound like this?

http://webzoom.freewebs.com/rooz328is/BADCAT.MPG

**mrkbik** · 09-09-2006, 11:35 AM

No, thank God

. It sounds like a really faint clicking sound, and only when I accelerate.

**94bmw325i** · 09-09-2006, 07:09 PM

hmm could a bad vanos solenoid do that, or something of that sort? Are you able to make a soundclip?

**mrkbik** · 09-09-2006, 11:24 PM

I could, but I actually haven't been hearing it lately. It would also be hard because I would need to make a sound clip while driving and accelerating. I have also since heard a whistling sound coming from the engine, and concluded that it is the ICV. I bought a new one, and I am installing it tomorrow. Could the two be related in some way?

**Kiterunner** · 09-15-2006, 05:54 AM

If its clicking, try checking the valve lifters. I experienced the sounds and upon checking, I found out that the valve lifters were faulty.

I was recommended to change them. My mileage is 135K. Recommend that you buy the originals...the OEM's will produce the clicking sounds after a few weeks. Goodluck..

**mrkbik** · 09-15-2006, 12:22 PM

Oh ok, I'll look into that.

**Mercenary(FH)** · 09-16-2006, 09:41 PM

how much are valve lifters and are they hard to install?

**Kiterunner** · 09-21-2006, 07:01 AM

The valve lifters are approx USD 36 (I think). Since the one making the clicking sound cannot be distinguished, all 24 of them have to replaced. Takes about 2-3 hours. Also do check for some minitiare parts that are below the liftersm they may need to be changed too. GOOD LUCK.

**Kiterunner** · 09-21-2006, 07:01 AM

USD 30 each...!!

**Kiterunner** · 09-21-2006, 07:02 AM

sorry...usd 36 each

**defkon99** · 09-21-2006, 08:06 AM

OK well i thnk i can relate, does it sound somewhat louder at about 15-20 mph rolling>? and can you hear this click on turns coming from the back? anything over 20mph you cant hardly hear it?

If you you got a case of warn out bearings bud. That was my problem, but i do not suggest taking a look cause if they are bad as soon as you pop off the hub the bearings will fall out. But i can say try this test :
Lift the problem wheel and try pulling it back and forth there should not be any play between the wheel and the hub.