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Old 12-15-2012, 07:37 PM   #1
emsfd125
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Default Can anyone help me!!! 05 WRX problem

I have an 05 WRX, my motor seems to be making this noise when the car is cold started. When the car warmed up the noise stopped and went away. What could it be? Tumbler Valve? Timing Belt? Clutch? Rod Knock?? I have no idea but the car drives perfect, no problems and when its warms up the noise went away and stayed away. Here is a video

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Old 12-15-2012, 08:09 PM   #2
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Tough to say over the video. Rod knocks generally change as the load on the engine changes. Yours could be a rod knock, but I've never heard one go away completely like that. I've heard hydraulic lifters do that, but more of a tick than a knock.

Get a stethascope from autozone or similar, and try to isolate where it's coming from.
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Old 12-15-2012, 08:12 PM   #3
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Listening to it again, I hate to say it, but it sounds like a rod knock. You could have a bearing that is spinning covering and uncovering the oil hole in the crank...

Don't drive it until you get a professional to look at it. Getting it fixed with just a rod knock is a lot cheaper than if you throw the rod through the block.
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Old 12-15-2012, 08:18 PM   #4
emsfd125
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Just weird how it would go away when car is warm. Rod knock doesnt just go away like that tho...
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Old 12-15-2012, 08:24 PM   #5
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Usually, you are right. But weird things can happen. If the bearing spins a little in the oil hole could be covered, causing the knock. If it spins a little more it could open the oil hole allowing oil to flow again. I'm guessing, of course.

No matter what, i wouldn't drive the car any more until I fixed what was wrong.
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Old 12-15-2012, 09:38 PM   #6
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Only way to tell the true cause of that sound is to bring it to a mechanic. It sounds like rod knock, but I've never seen it dissapear as the rpms increased. Quite odd...
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Old 12-16-2012, 10:05 AM   #7
emsfd125
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Pretty odd to me.. And how it completely goes away and how car drives beautiful
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Old 12-16-2012, 10:25 AM   #8
Mr Wrex
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Take a stethoscope or screwdriver to your engine and poke around for the source of that noise. It might be your timing belt tensioner too
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Old 12-16-2012, 01:05 PM   #9
emsfd125
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Ok just started the car again... Cold and no noise at all
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Old 12-16-2012, 01:15 PM   #10
emsfd125
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My buddy is gonna change out belt n tensioner for me... I meanno harm in tryin i guess
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Old 12-16-2012, 01:26 PM   #11
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What maintenance have you done on the car so far and at what miles?
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Old 12-16-2012, 01:37 PM   #12
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Umm none so far, i been in afghanistan and 60k miles on it ! What maintenence should i get done
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Old 12-16-2012, 02:10 PM   #13
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Tranny/rear diff fluid flush would be a good idea at 60k.
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Old 12-16-2012, 02:19 PM   #14
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Read up on this. It has all the info you'll need.

Also, I'll assume you're not over there on vacation so thanks for serving. You live pretty close to me fyi
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Old 12-16-2012, 07:29 PM   #15
emsfd125
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Haha nope no vacation lol, my buddy gonna do the tensioner n the whole kit for timing... Hopefully its that lol
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Old 12-16-2012, 07:32 PM   #16
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Ill prob do the tranny fluid n **** too
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Old 12-16-2012, 07:38 PM   #17
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I don't think that could be anything related to timing belt/idlers/tensioner.

That is probably something in the valve train or short block knocking around.

Maintenance is nice but you need to properly diagnose the issue before you start dumping money into this block crossing your fingers that the engine god will be pleased at your offerings and make the tap go away. Lol.

Pull the valve covers and give the valve train a visual inspection. I'd also drain the oil and inspect it for contaminants. I've never known rod knock to go away when the car warms up, but when that thing is nocking it sure sounds like it. Drain the oil and check for metal shavings.

Sub'd for an interesting problem.
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Old 12-16-2012, 09:26 PM   #18
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^ you have a good point... figure out the problem before performing maintenance to it. I really am curious to find out what the problem is because it sounds like knock but it goes away. I think your car is trolling us
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Old 12-16-2012, 10:25 PM   #19
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rod bearing is spinning... you need to pull the engine
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Old 12-16-2012, 11:01 PM   #20
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Quote:
Originally Posted by Black94Snake View Post
rod bearing is spinning... you need to pull the engine
As I said in post 2

Seriously though, DON'T DRIVE IT!!!! Inspect the con rod bearings first.

You MIGHT get lucky and only have to replace the bearings... In a straight I4, you can drop the pan, pull the rod caps, and at least LOOK at the bearings. Someone chime in and say if this can be done in a boxer... I would guess you can, but I have not done it.... yet.
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Old 12-17-2012, 06:49 AM   #21
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Quote:
Originally Posted by Bacon117 View Post

As I said in post 2

Seriously though, DON'T DRIVE IT!!!! Inspect the con rod bearings first.

You MIGHT get lucky and only have to replace the bearings... In a straight I4, you can drop the pan, pull the rod caps, and at least LOOK at the bearings. Someone chime in and say if this can be done in a boxer... I would guess you can, but I have not done it.... yet.
Yes, you can. Once he drops the pan and sees all of the metal flecks in the oil, it should become painfully apparent that he is destroying his engine with ignorance.
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Old 12-17-2012, 08:42 AM   #22
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Without watching the video at first, i thought it could be piston slap.

After watching the video, it definetely sounds like a bearing or something is rattleing around.
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Old 12-17-2012, 10:52 AM   #23
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It does sound like that but rod knock doesnt just stop or fix itself, and the bearing would make a continuing noise... It just stopped and hasnt come back yet
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Old 12-17-2012, 10:57 AM   #24
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So you're saying this happened once or a few times and hasn't come back since you recorded it?
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Old 12-17-2012, 11:45 AM   #25
emsfd125
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I left car runnin for 30 min day after it stopped didnt come back and drove it, im gonna check the oil today.. See if there is any metal pieces
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