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Old 02-18-2006, 03:15 PM   #1
gkbrowne89
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Default Engine Noise - Cold Engine

Hi all-

My wife owns a 2003 Impreza 2.5 Sport with roughly 37,000 miles. Within the last couple of months we've noticed an engine noise that sounds (at least to my ears) like improperly adjusted valve(s). We took it into the dealership and the first pass they found that the timing chain tensioner needed replaced which seemed pretty reasonable. They replaced it and the noise persisted. We went back and we were informed that nothing was wrong. It was explained that "That's the way these engines are". They attached a bulletin from Subaru explaining that some technical changes were made to the engine to reduce friction and therefore improve efficiency, this noise was the byproduct of these changes. Most notably the piston skirts had been shortened, resulting in Piston Slap. My question being, is anyone else experiencing this noise, and does the explanation seem reasonable. I don't want to get past the drivetrain warranty and find out that we've been had.

Thanks for reading

gb
Seattle, WA
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Old 02-18-2006, 03:20 PM   #2
orndog
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Very common in cold weather.
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Old 02-18-2006, 05:13 PM   #3
moogoob
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00RS I want to fill
your mouth with spiders

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sounds like a sewing machine
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Old 02-19-2006, 02:23 AM   #4
kamil212
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when the engine is cold it will make that noise, knocking sound, just ^^ like he said, a sewing machine.
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Old 02-19-2006, 11:00 AM   #5
orndog
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You guys have some loud industrial sewing machines then
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Old 02-19-2006, 02:39 PM   #6
buyos1717
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I was just about to post something similar to this. However, mine isnt only when its cold. Its when im around the 2500~3000 RPM marks. Usually when im in a higher gear when i shouldnt be or just accelerating around those marks. Mine sounds kind of like a squeaking or a belt slipping. Im not too sure what a sewing machine really sounds like but is that the type of sound you get at all? i found that when i have new oil or i put in premium (91 octane) as opposed to regular (87 octane) the sound goes away or is diminished drastically. Is this what you have?




This isnt a hijack!
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Old 02-19-2006, 07:13 PM   #7
moogoob
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[crock dundee]Thats not a hijack.... THIS is a hijack![/crock dundee]

ok, i dont have anything else....
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Old 02-19-2006, 07:26 PM   #8
sha_zapple
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It sounds like a stick running along a fence, or the wheel of fortune. A squeaking sounds more like belts slipping than anything.

Put a lighter oil (5w-30) in the engine during the winter months and the noise will go away faster.
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Old 02-19-2006, 11:10 PM   #9
buyos1717
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Quote:
Originally Posted by sha_zapple
It sounds like a stick running along a fence, or the wheel of fortune. A squeaking sounds more like belts slipping than anything.

Put a lighter oil (5w-30) in the engine during the winter months and the noise will go away faster.

Are you answering the first post or mine?
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Old 02-19-2006, 11:35 PM   #10
klug
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'05 LGT Wagon

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I have the same noise. Last winter I took it in and they replaced the timing best tensioner (under warranty) and no change. The colder it is the more prevalent it is. Now that it's dipped to -27C, it takes about 10-15 min to go away. I took it to the dealership and thay said it's OK. I think they're using the criteria that if it doesn't go away, it needs to be fixed. It only happens when you load the engine 1800-2500 RPM when cold. Only does it for 30 sec to 1 min at idle for a cold start, and then you can hear it when you load the engine. Can't hear it at all when the engine is completely warm. I'm not too worried. If it fails down the road I'll look at it as an opportunity to upgrade...

Hope this helps.

klug
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Old 02-20-2006, 08:12 PM   #11
AWDimprezaL
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its called piston slap, and any and all n/a 2.5's are notorious for it
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Old 02-21-2006, 12:24 PM   #12
snoopyone8
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2000 2.5RS SilverthornMet

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Hey, buyos1717, I have a 98 dohc that does exactly what you are describing...at temp, and under partial throttle at higher revs(3500-5000) there is a horrible noise... almost sounds like a bearing about to spin, but it has been doing it for 3 years now,about 75K miles. Im only guessing here, but from all i have heard and read, it has something to do with the piston and oiling systems design. Ive resigned to the fact that it is one of those and it helps me to sleep a little bit better everynight(I still lie awake and ponder the ulitmate RS but at least im not thinking about bad main bearings)
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