[cgat]

'01 Forester with about 213k

Engine makes a rattle like noise when revving between 1500 - 2000 rpm or on cold start. Sound appears to be come from around the A/C compress or behind. My brother loosen the belt attached to the compressor and thought it was unlikely coming from it. Here is a video that demonstrates the sound: https://photos.google.com/share/AF1...?key=b1hCU1hUQUFaZXcxTjRmRVhEYUpEcmNNRndQallR

Watch with sound on. No check engine light

Head gaskets were done a little over a year ago. Recently had an o2 sensor replaced (check engine light went on when I had this issue).

Thanks for the help.

Chris

 

[Konaru]

Sounds a bit like the Big End bearings are worn

 

[sleepstate]

That is rod knock

 

[Scooby24]

Doesn't sound like rod knock to my ear. Rod knock doesn't usually go away. Sounds like timing belt tensioner.

Watch below, skip to 4:30

 

[cgat]

Hey folks, I ended up getting it in the shop. Fortunately it was only the tensioner! This subby will live another day.

Thanks for the help

 

[2.5x_sleeper]

@cgat thank you for updating your thread with the solution! I'll add "SOLVED!" to your thread title. :wink:

The A/C belt tensioner was causing that rattle?

Bobby...

['07 FSXT MODding Journal] ['03 X MODding Journal]

 

[cgat]

No, it was the timing belt tensioner failed, so I guess the rattle was a wobbly timing belt. Lucky I didn't destroy the engine getting it to the mechanic!

 

[2.5x_sleeper]

Did you go ahead & do the complete timing belt maintenance... replacing all the wear parts, just in case the other parts are close to failing?

Bobby...

['07 FSXT MODding Journal] ['03 X MODding Journal]