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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 01-25-2013, 11:40 PM   #21
irwankencana
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Glacket,
I also having same problem. First, I thought it was lifters, so I changed all24 of them. Still the same noise, only better to my ear.
Searching through the forum, my next guess was loosen oil pump nut, so I opened oil pan (and changed gasket while doing all the trouble) following DIY in this forum only to find that my oil pump nut was very tight indeed.
So, if the issue of rod knock, can we fixed it or need new engine block?
For what it's worth, some of my instinct telling me, could be of damage catalic? because the sound appear to coming from the cat. converter?
Any input guys?
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Old 01-25-2013, 11:48 PM   #22
TiALT6
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That's definitely not coming from the cat.
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Old 01-26-2013, 12:59 AM   #23
Joshwa1234
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If you want a carfax pm me and I will tell you details i need and will do it for you no problem!
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Old 03-17-2013, 10:10 AM   #24
csa714
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Quote:
Originally Posted by Mango View Post
If the sound gets faster when you rev it, that's not a good sign. If I had to guess, the car was overheated before and headgasket blew with introduced water into the oil and one or more of the crank or connecting rod bearings took a dump. Look for any signs of overheat/work being done on the engine
Hi Mango - just curious - what would be the signs of overheat? Visible, or perhaps new parts associated with the work after it overheated?
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Old 03-17-2013, 10:18 AM   #25
Nerdy46
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Quote:
Originally Posted by csa714 View Post
Hi Mango - just curious - what would be the signs of overheat? Visible, or perhaps new parts associated with the work after it overheated?
Most common is a coolant smell from improperly cleaned engine bay after the mishap happened. Other things to look for is any new cooling system part or white residue around the engine bay.
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Old 03-17-2013, 11:12 AM   #26
csa714
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Originally Posted by Nerdy46 View Post
Most common is a coolant smell from improperly cleaned engine bay after the mishap happened. Other things to look for is any new cooling system part or white residue around the engine bay.
Tnx
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Old 03-17-2013, 01:54 PM   #27
mattcarle21
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Quote:
Originally Posted by csa714 View Post
Hi Mango - just curious - what would be the signs of overheat? Visible, or perhaps new parts associated with the work after it overheated?
Check under the oil cap for any chocolate milky type residue. They may have wiped it clean, but if not it will still be there. That's a sign of oil mixing with coolant.
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Old 03-18-2013, 12:19 AM   #28
hkbruin
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I may know another source for the sound...

I had a similar sound that started coming out of my car 2 weeks ago and was worried about it. I had to get my front brakes changed so I took my 2003 325i (130k miles) to an indy mechanic last weekend and they looked for the source of the sound. The sound of the knocking sounds more muted while in the car, but sounds pretty loud from outside.

They initially visually narrowed it down to the sound coming from my water pump pulley wheel missing two of the four bolts that keep the wheel on the water pump, and one of remaining bolts was about 2mm loose! Well, upon securing new bolts the following day, the sound didn't go away. It ended up being something wrong with the plastic impeller on the water pump that sits inside the engine. Not sure if it was warped or if a bearing went bad, but that was ultimately the source of the knocking noise. It was replaced with one with a metal impeller. Since the impeller does sit inside the engine, the sound was reverberating through the engine block.

Perhaps if you can remove the belt off of the water pump pulley wheel and spin it, you can check to see if it is seized or has an irregular rotation. I'm praying for you that it's not rod knock!
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Old 03-18-2013, 01:03 AM   #29
irwankencana
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for my case (sorry to hijack OP thread), the sound definitely coming from engine bay. i tried before to take out both alternator and A/C belt and even the clutch fan, just to find the sound still exist, and confirm sound coming from somewhere inside engine bay, and more loud on bottom (crankshaft ??)

Quote:
Originally Posted by hkbruin View Post
I had a similar sound that started coming out of my car 2 weeks ago and was worried about it. I had to get my front brakes changed so I took my 2003 325i (130k miles) to an indy mechanic last weekend and they looked for the source of the sound. The sound of the knocking sounds more muted while in the car, but sounds pretty loud from outside.

They initially visually narrowed it down to the sound coming from my water pump pulley wheel missing two of the four bolts that keep the wheel on the water pump, and one of remaining bolts was about 2mm loose! Well, upon securing new bolts the following day, the sound didn't go away. It ended up being something wrong with the plastic impeller on the water pump that sits inside the engine. Not sure if it was warped or if a bearing went bad, but that was ultimately the source of the knocking noise. It was replaced with one with a metal impeller. Since the impeller does sit inside the engine, the sound was reverberating through the engine block.

Perhaps if you can remove the belt off of the water pump pulley wheel and spin it, you can check to see if it is seized or has an irregular rotation. I'm praying for you that it's not rod knock!
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Old 03-18-2013, 06:27 PM   #30
glacket
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I had an indy do an inspection on the car and he said it was probably worn cam shaft or rocker arm. I still think its rod knock but i have been running the car for several months now and issue has not gotten any worse, however it does seem a little louder after changing the oil. I went from total elf 9000 to bmw oil. Im guessing the higher quality oil made it quieter.
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Old 05-10-2013, 06:53 AM   #31
pirixlu
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rod bearing

same happen to mine at exactly same miles 132k thought was the vanos but then noise got worst n louder ,im still on the process to fix it ,got a crank ,gaskets seals... have u fixed urs

Last edited by pirixlu; 05-10-2013 at 06:58 AM.
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Old 05-10-2013, 08:25 AM   #32
glacket
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No i have not fixed mine. it has not gotten louder since i bought the car back in december of last year. Indy mechanic said it was either the rocker arms or worn camshaft. While i would prefer that because it would be less expensive to fix, i dont believe it, but again it has not gotten worse that i have noticed.
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Old 05-10-2013, 10:05 AM   #33
pirixlu
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oh thats good ...
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Old 05-10-2013, 12:36 PM   #34
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sorry to hear that noise

Since the car is still running your best bet is start looking for:

1) A better indy shop
2) A used replacement motor
3) The previous owner to give him an earful. Heck, give him a dollar figure to help you out, although too much time has passed.

To those of us who know that sound, it aint good. I had that happen on my explorer and the car was off to the recycler. You are on borrowed time and it will end badly.

Get the engine replacement ready to go and put it behind you.
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Old 05-10-2013, 12:54 PM   #35
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I had a bad dual-mass flywheels that sounded almost the same.
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Old 05-10-2013, 05:21 PM   #36
pirixlu
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i totally agreed with rocket22 bc mine start knocking sometimes at start up in the cold mornings sometimes it'll just go away like theres was nothin then 2 days after , the spun bearing span so bad that i scarred the crankshaft so bad while driving in the high way , it took me 6 months before this happen ,and car was stored since then till now i got the engine off to =rebuilt the bottom all the gaskets the conrod weared out to as well so new 1 had to go along with all gaskets bearings ,valve seals valve job , head gasket new ,can't wait to put my baby back on the streets ...
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Old 06-07-2013, 11:07 PM   #37
CORVAIRWILD
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It needs to be hot, and revved. I will donate a mechanics stethoscope, shipped... free. PM me addy...

Quote:
Originally Posted by glacket View Post
Hi, I just purchased a used 2002 330i through private sale. I am ok with everything except the tapping from the engine. I just want to make sure its not critical and hopefully wont need a new motor. i've listened to alot of different vanos, disa and tappet recordings so far and they all sound a little different so i figured i would post mine as well. Anyone have an idea of what this could be? Thanks!



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Old 06-08-2013, 11:33 PM   #38
pirixlu
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bad conrod

thats crank bearing shells and u better stop the car and replace em before it end up wearing the journals if its not wore already
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Old 06-09-2013, 10:26 PM   #39
CORVAIRWILD
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What kind of job is it to drop the oil pan and take a peek inside? Removing a lower rod bearing cap would answer alot. Engine may have overheated, ran out of oil... who knows?!?!?
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Old 06-09-2013, 10:59 PM   #40
MJLavelle
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That does not sound good at all. I can tell you for sure that a 330 should not sound like that. Sorry, but Mango may be right.
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