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Old 12-19-2015, 04:12 PM   #1
sr.hudson19
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Default Weird knocking issue

First I'd like to say that I have searched around quite a bit before making this post to see if I could find anyone having this knocking noise as well.

Car: 2006 Subaru WRX TR. Completely bone stock running Rotella T 10w/40 oil.


Last week I was out in colorado traveling through some of the of mountain passes when I came down one of the passes my car was in neutral, I was not on the gas at all so my car was rolling at idle and then I start hearing some gnarly knocking noise.

I get it parked real quickly and check the oil. The oil level was fine, but added just a wee bit more for peace of mind.

Drove back to my buddies house and realized that it does it, not only at idle, but when I am in 1st gear feathering out the clutch and giving it a little bit of gas you can hear it making that knocking noise. But when the car is under normal load from driving it doesn't make it at all. The only times I have heard it is at idle and at low rpm's trying to get it driving again such as driving through a drive through, or stopping at a red light and getting going again.

After that I drove it all the way home from Colorado to Ohio (I know ballsy move, but I had to get it back) in one shot and the only time I heard the noise at all was my last gas stop....? I told my brother it sounded like a deep knocking noise that almost sounded like it was coming from the engine, but he had suggested possibly a clutch or bearing or something of that sort? Any ideas?

I will post up a video a wee bit later
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Old 12-19-2015, 04:29 PM   #2
jason02wrx
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Does it knock when you lift to shift at say 2500-3000rpm?

At idle does it knock when you stab or lift off the throttle?

This don't sound good. Get prepared.
Edit: YouTube Wrx rod knock.
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Old 12-19-2015, 04:33 PM   #3
sr.hudson19
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When driving it and shifting from any of the gears it sounds completely normal. I don't hear anything out of the norm.
and at idle it will knock if I press on the gas but it goes away after a high enough RPM.
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Old 12-21-2015, 01:13 PM   #4
wrx1392
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could be a bad Timing belt tensioner ,they make a knocking sound . listen to the drivers side cam belt cover to see if the sound is coming from this area. if it was a Rod knock it would have gotten a lot worse on the drive home .
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Old 12-22-2015, 03:38 PM   #5
sr.hudson19
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After doing some research on the timing belt tensioner, that is the same exact knocking noise that I am getting from my car! Thanks for the suggestion! I appreciate it!
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Old 12-22-2015, 05:14 PM   #6
wrx1392
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your welcome ,I have been there my self. mine went right after I started it after a rebuild ...I was totally freaked out .
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Old 12-24-2015, 01:54 PM   #7
Dieselman
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So if someone could help me out on my 2005 stock 2.5 turbo just bought it and on the 2hr drive home 1hr before I got home it started ticking then missing and ticking and by the time I made it home hard knocking
All fluids good but no power by the time I got home
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Old 12-24-2015, 01:56 PM   #8
Dieselman
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Checked compression this is what I got.

Compression #s
1. - 130
2. - 40psi
3. - 130psi
4. - 90psi
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Old 12-24-2015, 01:57 PM   #9
Dieselman
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Oh and I should add I have the receipts for a dealer replacement of the engine/ turbo
About 30k miles ago
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Old 12-24-2015, 02:07 PM   #10
Awd_addict
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Those compression numbers are not good. Make sure your testing it the correct way.
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Old 12-24-2015, 02:11 PM   #11
jason02wrx
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If he's getting 130ish on one side it's safe to say he's doing it right.

Sounds like it's done.
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Old 01-01-2016, 06:12 PM   #12
Dieselman
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So I seated my compression tester in the spark plug hole and cranked to watch the needle bounce up three times, I also cranked additional times to see if the numbers got much higher but they all were really close to that 3rd one.

I most likely will do a leak down next, but as I am new to subarus is there common things that fail that might cause this,
Wearing rings, Burnt croaked valves, cracked head....

I know some vehicles specific years had certain issues.
Any help is greatly appreciated
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Old 01-01-2016, 09:31 PM   #13
tomacGTi
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Check your static timing on the DS side.

You may be out a tooth causing the lower numbers on 2-4.
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Old 01-01-2016, 09:34 PM   #14
Awd_addict
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I'm also chasing a knock but mine is a fresh rebuild I'm currently draining the oil through a coffee filter. The first time I tried I don't think the oil was in long enough or I didn't run the car long enough to produce bearing pieces.

So have you pulled the drivers side timing cover and check the tensioner ?

Run the oil through a stainless coffee filter - I'm using a paper filter and a bowl like flour siv
Is it smoking ?
My first knock I encountered in May was #1 rod bearing and it was a rapid noise the first showed up in between shifts when I would let off the gas pedal. This knock I'm having now is near # 2 cylinder and is exactly in time with my cam gears as far as I can tell. Compression stroke on #2 actually.

https://m.youtube.com/watch?v=hjdjz1tbmjU

^^ my rod knock

https://m.youtube.com/watch?v=qzbcCRPpNEo

^^ my new noise. This sounds similar to a bad belt tensioner. Does yours sound like either ?

Last edited by Awd_addict; 01-01-2016 at 10:14 PM. Reason: Damn auto correct
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