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2005 Forester XT
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100 Posts
Discussion Starter #1
I live in Wisconsin, and its right around the time of year where it gets extremely cold. Within the last month, i've noticed a rattling noise coming from the engine bay when I press down slightly (or hard) on the gas. I only hear the sound starting from a stop in first gear, and occasionally in second gear. Also, the sound can be heard if I have the car in neutral and just tap the gas.

Like I stated earlier, its just a rattling noise, almost like a quick tapping sound. I've noticed however that the sound gets worse the colder it gets. If I leave the car in a warm area, it only makes a very faint rattle. If its left out in the cold, the rattle is worse. (So im assuming that the cold weather triggers this.)

A friend of mine suggested that it may be piston slap?, but i'm not to sure at this point.

Anybody else have an idea of what it could be/how to fix it?

Thanks
 

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95 Posts
This may sound to simple but I had the same problem and all it was is the stock intake muffler box thingy was loose and hitting the side of the fender when idling or shifting gears. I just cut it all off and am hoping to build an aluminum intake. Just something to check.
 

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2015 Forester X 6MT 6-Gear Manual
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1,373 Posts
Yes , I could. The "Gap" between the cam base circle an the tappet with the valve closed* The gap (clearance) becomes less as the engine warms. typically 7-20 thousandths of an inch.

* on inverted bucket tappet DOHC like your XT employs.
 

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Registered
2005 Forester XT
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100 Posts
Discussion Starter #8
Yes , I could. The "Gap" between the cam base circle an the tappet with the valve closed* The gap (clearance) becomes less as the engine warms. typically 7-20 thousandths of an inch.

* on inverted bucket tappet DOHC like your XT employs.
ok thanks for the help!
 

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99 Forester
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29 Posts
A failing timing belt tensioner also typically sounds like a knock. Do you know where the noise is coming from? Front of the engine, back of the engine, underside, top, exhaust area, etc?
 

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Registered
2005 Forester XT
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100 Posts
Discussion Starter #10
I took it in to have it checked out.

It turned out to be my aftermarket boost solenoid that was making the noise. Does this sound normal?
 
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