Subru

Whats this noise?

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Was just warmed up from 15 min drive, didn't hit boost or anything but when I backed down driveway I heard this pok pok pok noise.

Changed plugs and oil last week. Oil level on dipstick is quite high (maybe I put too much oil in?)

Any ideas what it is?

 

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Just now, Loren said:

BEB?

That was my first thought but I just hope its not :S

Im pretty sure I hear it in the left side near the heads/rocker cover if that helps.

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It's hard to tell how loud it is on the video... could it just be normal valve train noise? Did you put some different oil in there?

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Its the same oil in terms of it being 10w40 but this time I used fully synthetic as there was some in the cabinet at home.

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I think it's normal noise... mine makes a lot of mechanical noise... do you have hard engine mounts?

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Yeah I do.

Ill take another listen when im back there. Im pretty sure it did start making that noise tho. Usually big ends have a louder rattly, clickly noise.

Your right they do make a lot of noise in there.

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Big ends can start off as a very quiet knock and progress to an all out cacophony of metal on metal noise.

 

My engine, especially since installing hard mounts is pretty loud at idle, especially when cold. Listening to your video again

I think it's completely normal noise.

Edited by Loren
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I'm gonna say it's either a tiny exhaust leak, or the injectors. My pinks were loud as a loud thing.

 

EDIT: Check your power steering fluid level too for good luck.

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Cambelt changed around 70000kms, 5-8 years ago. Cant remember exactly.

When I go back to the house (this weekend) ill take a better look at it. If I dont know I can always take it to macbilt or somewhere near there. They are only a few mins away.

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update:

When I leave the car for a week some oil leaks on exhaust (I assume) and starts smoking after 10 mins but does burn off. I really gotta do the rocker cover gaskets some time...

So I took it back out Saturday and the noise was gone, drove 10 mins and then rechecked oil and coolant. Noticed coolant overflow was almost empty (topped it up few weeks ago). Took it for a decent drive to get it up to temperature and then the noise came back. Here is another video with some small revs. Better to listen with headphones if possible.

As the noise had gone but came back when it was warm, im hopeful its not big end as that would make noise all the time.

 

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I have an aluminum pulley on the crank, and I haven't (probably ever) been able to do it up tight enough, when it gets loose it makes a similar sound.

 

On 1/28/2019 at 1:03 PM, pedro said:

How old is the cambelt etc ?

 

I did some reading trying to diagnose mine and alot of people were saying the tensioners can fail and make this sound.

 

 

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1 hour ago, Jono24 said:

I have an aluminum pulley on the crank, and I haven't (probably ever) been able to do it up tight enough, when it gets loose it makes a similar sound.

 

I did some reading trying to diagnose mine and a lot of people were saying the tensioners can fail and make this sound.

 

Hmmmm. Maybe throw a little bit of 243 Loctite on the bolt next time you do the crank pulley bolt up? That's the mid strength stuff, so basically holds the bolt in place, and can be broken reasonably easily. Just an idea I thought I should throw out there...

 

Also check to see if the tensioner is wet at the top, where the little rod comes out - if it's wet there, it means the internal seals have failed, and it's not providing proper tension.

 

Also, some anti-seize on the bolts that hold on the plastic covers for the cambelt cover is a good thing to do - they're known to seize, and then be an absolute ass to get out if you break the captive nut loose in the plastic in the backing plastic(s).

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The noise is on driver side of engine not in the center. I did some research and it could be the idler like jono and individualities said.

The noise stops when its cold so would that mean its not big end failure? I would assume that would make noise all the time. 

Kinda does sound like a big end tho :(

 

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Is it just me or is there smoke coming from somewhere at 21-22 seconds?

Sounds kind of like an exhaust leak.

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8 hours ago, pl0x said:

Is it just me or is there smoke coming from somewhere at 21-22 seconds?

Sounds kind of like an exhaust leak.

Yes probably. Im pretty sure oil is leaking from rocker cover onto manifold as when I drive it after a week I get a lot of smoke coming out of bonnet and then it stops/almost stops smoking.

Could be exhaust leak ill look into that.

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Solved:

So I went took the car for a drive to get it hot and when it started making the noise I had a look around. I pressed my finger on the two left side coil packs and one of them was vibrating as it made the noise. Took coil off and found spark plug was loose. When changed plugs I mustn't have tightened it enough as Im always scared of over tightening. Nice easy fix. Sure easier fix than over tightening it.

 

On my ratchet I counted 36 clicks until it goes around 360 degrees so from now on I tighten plugs around 24 clicks therefore around a 2/3 turn.

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4 hours ago, Subru said:

Nah it was running fine. I would have noticed that.

 

yeah, but if the spark plug was loose enough to rattle... it wouldn't have been holding any compression.

Or was it not actually loose enough to move... just not as tight as it should have been?

Edited by Loren

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Just now, Loren said:

 

yeah, but if the spark plug was loose enough to rattle... it wouldn't have been holding any compression.

Yeah possibly was losing a bit of compression but it felt normal while driving off boost anyway.

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Its hard  to over tighten and damage spark plug threads..

You are more likely to do damage if you leave them loose..

Just do them up until they are firm and give them another tweek..

Are you using copper coat on the threads ?

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3 hours ago, pedro said:

Just do them up until they are firm and give them another tweek..

Are you using copper coat on the threads ?

 

I've heard quarter turn with a ratchet after they're snug by hand. The crush washer on the plug will hold them in there pretty good.

I personally use copper coat on mine; just a smidge. Otherwise some sort of rust penetrator is another option.

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