('01-'02) Loud rattle from engine, 1500-2000 rpm - SOLVED! - Subaru Forester Owners Forum
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post #1 of 8 (permalink) Old 06-11-2019, 08:57 PM Thread Starter
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Loud rattle from engine, 1500-2000 rpm - SOLVED!

'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/AF1Q...pEcmNNRndQallR

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

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post #2 of 8 (permalink) Old 06-14-2019, 01:03 PM
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Sounds a bit like the Big End bearings are worn

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post #3 of 8 (permalink) Old 06-14-2019, 01:10 PM
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That is rod knock

sleepstate

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post #4 of 8 (permalink) Old 06-14-2019, 01:23 PM
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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
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post #5 of 8 (permalink) Old 06-17-2019, 03:53 PM Thread Starter
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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
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post #6 of 8 (permalink) Old 06-17-2019, 04:16 PM
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@cgat thank you for updating your thread with the solution! I'll add "SOLVED!" to your thread title.

The A/C belt tensioner was causing that rattle?

Bobby...

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

'07 FSXT - COBB Surgeline dyno stock Protune - Stage 1+
'03 X +AVO turbo kit = XT (son's)
'95 Neon Sport
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post #7 of 8 (permalink) Old 06-20-2019, 08:20 AM Thread Starter
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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!
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post #8 of 8 (permalink) Old 06-20-2019, 08:26 AM
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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]

'07 FSXT - COBB Surgeline dyno stock Protune - Stage 1+
'03 X +AVO turbo kit = XT (son's)
'95 Neon Sport
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