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Old 01-04-2010, 12:07 PM   #1
Tainen
Scooby Specialist
 
Member#: 82251
Join Date: Mar 2005
Chapter/Region: NWIC
Location: Renton, WA
Vehicle:
2001 e46 330i sport
13 SWP BRZ

Default knocking... what to do?

Just started my car up yesterday morning, and it immediately started knocking pretty bad. First time, never done it before, etc. I've already run 2/3rds of a way thru this tank of gas. I looked at the oil levels, it was a little below the low mark, so I added a quart and it brought it up near the top mark, so it was maybe a third quart low. Started it back up, the knocking got a little quietter, I'm guessing it's probably the ECU adjusting for the knock, but the CEL never came on.

I sat the car today, drove the wife's 2.5i to work, and I'm a little unsure what to do. I dont' want to bring it to a shop quite yet to have them tear apart the block or whatever, since I'm in the middle of buying a house and can't afford engine repairs.

I did my timing belt about 4k ago at All Wheel Drive Auto in kirkland. Could the timing be off or something?

HELP! Give me advise pls.

Rick
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Old 01-04-2010, 01:40 PM   #2
02CWRX
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Member#: 196013
Join Date: Nov 2008
Chapter/Region: NWIC
Location: Woodinville, WA
Vehicle:
2002 WRB WRX
EJ207 6-Speed

Default

Oil below the low mark and knocking? Yikes. Could be a timing belt tensioner or pulley that went out however. Also, some exhaust leaks can sound like a knock (my header blew apart and could sound like a knock to an untrained ear). Although, adding oil would realistically only quiet down one of those (failed bearing), unless the car came out of cold startup idle at the same time and decreased RPMs which would slow/quiet a timing belt tensioner or pulley issue as well as an exhaust "knock". If the knock is constant and varies with RPMs, that's not so good. However, when my motor spun a bearing it was almost silent at idle after the knocking at initial startup, but really knocked over 2500 RPMs or so.

In hind sight, on some cold startups it would knock for a second or two then be silent the whole time driving and for the rest of the day. I assumed timing belt tensioner. If I had an oil PSI gauge at the time I bet I would have seen a drop off in pressure and been able to stop driving it before it did as much damage as it did to the crank/rods.

The quickest and easiest way to get a better idea is to take a look at the oil PSI if you have a gauge (look for a drop in pressure), and even if you don't, step two is do an oil change yourself into an open top pan so you can see the oil. If its a bearing causing the knock, you will see the "glitter" in the oil from it, no need to tear the block apart.

~T.J.

Last edited by 02CWRX; 01-04-2010 at 01:46 PM.
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Old 01-04-2010, 01:50 PM   #3
JasonLHall
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Member#: 111318
Join Date: Mar 2006
Chapter/Region: NWIC
Default

I usually go to here for questions like this

http://forums.nasioc.com/forums/forumdisplay.php?f=37

Another idea is to call All Wheel Drive and explain to them
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Old 01-04-2010, 01:51 PM   #4
Tainen
Scooby Specialist
 
Member#: 82251
Join Date: Mar 2005
Chapter/Region: NWIC
Location: Renton, WA
Vehicle:
2001 e46 330i sport
13 SWP BRZ

Default

I had *all* of the tensioners replaced, and water pump replaced when I did the timing belt.

I revved it just a little bit, and the knocking appeared to get faster with the RPM increase.
I don't have an oil pressure gauge...

I haven't moved the car at all since it started knocking.

Can I tell from the oil dipstick if it's a failed bearing?
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Old 01-04-2010, 01:54 PM   #5
02CWRX
Scooby Specialist
 
Member#: 196013
Join Date: Nov 2008
Chapter/Region: NWIC
Location: Woodinville, WA
Vehicle:
2002 WRB WRX
EJ207 6-Speed

Default

If its really bad, you may be able to see the metal flake in the oil on the dipstick from what is aggitated into the pan reservoir, but for the most part the flake will "settle" at the bottom even with the flow of the oil, and will be most easily seen by draining it.

Where are you located?

~T.J.

EDIT: I've seen more than a fair share of failed parts that were new also, it could still be a failed tensioner. With recent work and new parts in that area, you might be "lucky". The low oil still has me worried though.

Low oil means that the pickup tube may not be fully submersed in oil the way it should and could starve the motor for oil for short bursts or long times, especially during higher RPMs, cornering, hills, etc. Repeated starving of oil for short bursts will eventually take its toll on those bearings when they don't have that constant oil flow over them they need while things are spinning. FWIW, I check my oil every time I get gas, and if not that, at the most every other time and I carry a quart for top offs if needed.

Last edited by 02CWRX; 01-04-2010 at 02:02 PM.
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Old 01-04-2010, 03:04 PM   #6
TrickNipple
moon moon
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Member#: 86213
Join Date: May 2005
Chapter/Region: NWIC
Location: Wild wild Northwest
Default

Post in the correct forum, NWIC is not the place for this kind of question.
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