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Old 10-10-2012, 12:14 PM   #1
amorgan93
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Default soft knock front of engine (video)? 2004 2.5XT

There is this soft knocking from front my 2004 forester xt. Can be heard best at around 1200 rpm, I had a weight on the gas pedal holding it at the exact rpm where it can be heard best. No noises in higher rpm, can faintly be heard between idle and 1500rpm. I dont think its pronounced enough to be a big end failure, its a somewhat softer knocking noise. Also, the noise remains even with the accessory belts removed. Any ideas of what it could be?

any help is appreciated!
thanks!


Youtube video of STI with bad belt tensioner. Sounds kinda similar doesnt it? The engines in both videos are even spinning the same rpm.
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Last edited by amorgan93; 10-10-2012 at 12:37 PM.
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Old 10-10-2012, 06:23 PM   #2
art@grimmspeed
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That could be a very good possibility. I would check it asap brfore it has a chance to get worse.
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Old 10-11-2012, 03:38 PM   #3
stevejones19
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I am no expert on this, but I have had the same noise for quite awhile. I just ordered a new timing belt kit, and hoping that will take care of it. I could only reasonably believe it to be the tensioner in my case. The 2 stages my car has been through were tuned by very reputable tuners, and fluids were checked very regularly, so I doubt (more wishful thinking) that i'm having a knock.

What are your miles/mods?
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Old 10-11-2012, 04:11 PM   #4
Uncle Scotty
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rod knock and a failing timing belt tensioner sound very similar

rod knock is usually apparent at higher rpm

what oil...EXACTLY....is in it
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Old 10-11-2012, 04:26 PM   #5
teiva-boy
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being a 2004, when was the timing belt and other items changed as part of your normally scheduled maintenance?
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Old 10-11-2012, 09:01 PM   #6
stevejones19
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Quote:
Originally Posted by Uncle Scotty
rod knock and a failing timing belt tensioner sound very similar

rod knock is usually apparent at higher rpm

what oil...EXACTLY....is in it

This really good news on my end then, glad I saw this.
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Old 10-12-2012, 02:34 PM   #7
amorgan93
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I run rotella t6 5w-40. The timing belt and head gaskets were supposedly done at 124k according to the place I bought it from. I bought the car at 130k. There is evidence that someone has been under the hood, the plastic timing cover has a chip about the size of a quarter missing out of it, right under the crank sensor. I question if they just replaced the belt instead of all the pulleys, etc..

My car is cobb OTS stage 2, with a catless uppipe, invidia catless downpipe, and 05 sti catback. Have an 09 sti tmic sittin in the garage, hoping to go stage 3 soon.
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Old 10-12-2012, 05:42 PM   #8
stevejones19
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Yes some people try to skimp and save money. Just re-using the tensioner and not touching the water pump or idler pulleys.
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Old 10-13-2012, 11:00 AM   #9
JayDavies15
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Needs a timing belt tensioner. Id do the water pump and pulleys too. Gates makes a kit that you can buy on extremepsi.com for around $300.
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Old 10-13-2012, 12:36 PM   #10
amorgan93
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Yep was looking at the complete timing belt by gates, seems that it has good reviews amongst other subaru owners. What's not fun is timing a 2.5 DOHC, and I've never timed one that has AVCS, I don't know if that makes a difference or not.
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