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Old 08-11-2007, 05:34 PM   #1
lowkey
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Member#: 17518
Join Date: Apr 2002
Chapter/Region: MAIC
Location: arlington
Vehicle:
2002 wrx
silver

Default Help diagnose my engine problem - ticking/rattling

Coming home on the highway today my engine (2002 wrx) started making a slight ticking noise at about 3500-4500 rpm. Took it home, let it sit for an hour, and now it has a slight ticking at idle that intensifies when the engine is revved.

As far as what caused it, a few minutes before the problem began I filled up with an off brand gas and then bounced off the rev limiter when getting onto the highway. I realize it's probably not bad guess, but I'm hoping it's not a valve problem.

relevant mods: cobb stage 1.

Any thoughts or ideas? Thanks.

edit: video
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Last edited by lowkey; 08-11-2007 at 05:58 PM.
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Old 08-11-2007, 05:38 PM   #2
mxboy15u
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Post up a short video of the noise with your hood open, and then you blipping th e throttle with the hood open. You could have rod knock, an exhaust leak, noisy injector etc. A video will really narrow it down.
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Old 08-11-2007, 05:42 PM   #3
2.5 Blue Roo
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my sti makes so many damn clicking noises, it's really loud, but its always been like that
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Old 08-11-2007, 05:44 PM   #4
lowkey
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Quote:
Originally Posted by 2.5 Blue Roo View Post
my sti makes so many damn clicking noises, it's really loud, but its always been like that
Sadly this one is definitely new.

I'll try to get a quick video of the engine.
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Old 08-11-2007, 05:54 PM   #5
lowkey
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Amazing low quality video from my ancient kodak digital camera is uploading. It is *ahem* slightly low quality and a .mov file, but hopefully it will get the point across.

edit: Here's a link. Let me know if it works:

Last edited by lowkey; 08-11-2007 at 05:55 PM. Reason: added link
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Old 08-11-2007, 06:05 PM   #6
mxboy15u
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Whew...that is a pretty loud knocking noise. I have only heard a couple engines with rod knock...your video is fairly low quality so its tough to say but it does sound like rod knock to me.

Here is another video of rod knock...

http://sonic.net/~eighth08/womp/00001.mpg
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Old 08-11-2007, 06:27 PM   #7
lowkey
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Quote:
Originally Posted by mxboy15u View Post
Whew...that is a pretty loud knocking noise. I have only heard a couple engines with rod knock...your video is fairly low quality so its tough to say but it does sound like rod knock to me.

Here is another video of rod knock...

http://sonic.net/~eighth08/womp/00001.mpg

After seeing that video (much better quality ), my noise isn't nearly as pronounced or consistent (for lack of a better word) as that, but I don't really know what to say.
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Old 08-11-2007, 07:38 PM   #8
MasterKwan
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Change your oil, send some in to be analyzed and check the bottom of the drain bucket for yellow metel flakes. Use a cleaned out drain bucket. Cut the oil filter open and examine it for metal. If you find metal, it's probably rod bearing. If you don't then it's probably not. The oil analysis will tell you for sure if the engine's OK.

It could be a timing belt tensioner too. If it's a rod knock, it'll only get worse so, you'll find out sooner or later. Since fixing these engines when they have a knock isn't really in the cards, I doubt it matters whether you keep driving on it. On a conventional inline 4, if you catch it early enough you can probably save the motor. Not apparently on a suby.
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Old 08-11-2007, 08:06 PM   #9
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Old 08-13-2007, 09:02 AM   #10
lowkey
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silver

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Well, after starting it cold for the first time since the problem started, it sounds a lot more like the rod knock in the other video posted. Now the next step...recommendations for a shop and new engine?

Last edited by lowkey; 08-13-2007 at 09:17 AM.
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