engine kocking rattling

[yves]

Hello

I have a persistant motor noise problem

I have a 97 Legacy 2.2L that has that banging noise. When I stand
right beside the hood it sounds almost like a diesel. When I open the
hood it seems to be something with the belt. I ran it without the
outer belt, no change. I read a lot about piston slap and timing belt
rattling and the belt tensioner. So at 128000 km I replaced the timing
belt. I examined the tensioner, it looked like new and was in perfect
condition, having lots of force and good hydraulic damping, so I
didn't replace it with a new one. Still the same noise after the
timing belt change. I then removed the two outer timing belt covers
and let the motor run. The timing belt rolls perfectly, at least
everywhere I could see with a flashlight. And the noise is still
exactly the same as with the covers on. That makes me believe that
nothing is wrong with the the timing belt and everything around there.
The noise is most prominent when cold at idle and around 2500rpm. At
around 4000rpm, it's never there. When warm, most of the time it's
gone at idle and pretty lound between 1000 and 2000 rpm. But sometimes
when warm the noise comes back at idle. It definetly has nothing to do
with the exhaust pipes and heat shields.

Do I have the piston slap? Impossible with a 2.2L?

Yves

 

[Florian Feuser \|FFF|\]

Hello

I have a persistant motor noise problem

<snip description>

Do I have the piston slap? Impossible with a 2.2L?

Yves

AFAIK, the 2.2l doesn't usually suffer from piston slap. If the problem has
developed over time, there may be some unusual wear in the cylinder walls (out
of round?)

Prior to anything drastic (and expensive) I suggest:

Do a compression check
Check plugs for damage (detonation?)
Then check the spark timing
maybe reset the engine computer by pulling off the battery cable overnight
fill up with premium gas (for comparison)
have knock sensor replaced

Good luck,

florian (had a 2.2l Legacy that sounded like a diesel once when I got a bad tank
of gas)

 

[Subbie87]

Hello

I have a persistant motor noise problem

I have a 97 Legacy 2.2L that has that banging noise. When I stand
right beside the hood it sounds almost like a diesel. When I open the
hood it seems to be something with the belt. I ran it without the
outer belt, no change. I read a lot about piston slap and timing belt
rattling and the belt tensioner. So at 128000 km I replaced the timing
belt. I examined the tensioner, it looked like new and was in perfect
condition, having lots of force and good hydraulic damping, so I
didn't replace it with a new one. Still the same noise after the
timing belt change. I then removed the two outer timing belt covers
and let the motor run. The timing belt rolls perfectly, at least
everywhere I could see with a flashlight. And the noise is still
exactly the same as with the covers on. That makes me believe that
nothing is wrong with the the timing belt and everything around there.
The noise is most prominent when cold at idle and around 2500rpm. At
around 4000rpm, it's never there. When warm, most of the time it's
gone at idle and pretty lound between 1000 and 2000 rpm. But sometimes
when warm the noise comes back at idle. It definetly has nothing to do
with the exhaust pipes and heat shields.

Do I have the piston slap? Impossible with a 2.2L?

Yves

It sounds like the oil pump is bad. Subaru oil pumps go bad around
80,000 miles & your at 78,100 miles. Check it as soon as possible
before the engine goes.

 

[AM]

Do I have the piston slap? Impossible with a 2.2L?

Yves

I don't know if you have it but my 98 2.2L did.