Matt Follett Godlike Moderator Location: La Belle Province, Montreal Join Date: 03/13/2006 Age: Possibly Wise Posts: 646 Rally Car: Don't Laugh, the Justy is Fun! |
Hey Suby folks,
My father has an '07 Forester, 2.5L 350,000kms.... Started making what sounds like a bit of perhaps piston slap noise in the cold. Apparently was going away once warm, but sometimes not. He says it could be the batteries in his hearing aids making it go away...  Mostly under load, not too loud, I can make it do in netural at just a really narror rpm window (about 2000-2400).
Should he be concerned? (His last vehical was a Pathfinder he managed 650,000 out of... he's a pilot, drives smooth) Matt |
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Another common problem, with this sort of symptom, is a failing timing belt tensioner (which I THINK Gene is hinting at)
Essentially the hydraulic ram that puts the tension in the tensioner looses pressure when cold and allows it to flap back and forth, making the knocking sound, and then slowly comes up to pressure. First Rally: 2001 Driver (7), Co-Driver (44) Drivers (16) Clerk (10), Official (7), Volunteer (4) Cars Built (1), Engines Built (0) Cages Built (0) Last Updated, January 4, 2015 
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Matt Follett Godlike Moderator Location: La Belle Province, Montreal Join Date: 03/13/2006 Age: Possibly Wise Posts: 646 Rally Car: Don't Laugh, the Justy is Fun! |
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Grant Hughes Senior Moderator Location: Whitefish, MT Join Date: 01/11/2006 Age: Midlife Crisis Posts: 6,818 Rally Car: BMW |
Matt Follett Godlike Moderator Location: La Belle Province, Montreal Join Date: 03/13/2006 Age: Possibly Wise Posts: 646 Rally Car: Don't Laugh, the Justy is Fun! |
Banned Mega Moderator Location: La la land Join Date: 01/25/2006 Age: Fossilized Posts: 3,740 Rally Car: Not a Volvo |
Banned Senior Moderator Location: Calgary, AB Join Date: 03/27/2009 Age: Ancient Posts: 1,798 Rally Car: (ex)86 RX-7(built), (ex)2.5RS (bought) |
I had the toothy idler come through the front cover last summer. Not fun at all.
It appears the new tensioner that went in was defective and quickly started to 'tap' away. (causing a hunting idle, methinks, because the knock sensor would pull the timing...) My best guess is that if he noise goes away when warm, it probably isn't a rod. (happily corrected if I'm wrong) I doubt you can diagnose tensioner vs. piston slap over the internet. Either is possible. First Rally: 2001 Driver (7), Co-Driver (44) Drivers (16) Clerk (10), Official (7), Volunteer (4) Cars Built (1), Engines Built (0) Cages Built (0) Last Updated, January 4, 2015
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Grant Hughes Senior Moderator Location: Whitefish, MT Join Date: 01/11/2006 Age: Midlife Crisis Posts: 6,818 Rally Car: BMW |
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Matt Follett Godlike Moderator Location: La Belle Province, Montreal Join Date: 03/13/2006 Age: Possibly Wise Posts: 646 Rally Car: Don't Laugh, the Justy is Fun! |
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