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Loud Ticking-Rattle
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Old 26 Oct 2009, 09:42 AM   #1 (permalink)
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Loud Ticking-Rattle

I own a 2005 Subaru Impreza 2.5RS Sedan. I have a very loud ticking or rattle noise coming from under the hood. Sound only occurs when gently accelerating; around 2500 to 3000 rpm, then levels out and goes away at higher rpm. Rattle intensifies when car is under load, going uphill, and when using the air conditioner. Occurs in most gears from 2nd through to 5th.

Car must be driven to hear rattle, because at a full stop while car is idling in neutral, engine revs perfectly clean no noise ticking or rattles through all revs. Noise only occurs while the car is in motion.

My first thought was engine “ping” due to low octane fuel. I ran premium fuel for a year, but it did not help. Noise has been an issue for a long while and increases each year. We have had this checked before but the problem is never found. I just want to make sure it is nothing serious.

Thanks for your time,

Derek
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Old 15 Apr 2011, 10:46 AM   #2 (permalink)
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Re: Loud Ticking-Rattle

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Originally Posted by DerekStewart View Post
I own a 2005 Subaru Impreza 2.5RS Sedan. I have a very loud ticking or rattle noise coming from under the hood. Sound only occurs when gently accelerating; around 2500 to 3000 rpm, then levels out and goes away at higher rpm. Rattle intensifies when car is under load, going uphill, and when using the air conditioner. Occurs in most gears from 2nd through to 5th.

Car must be driven to hear rattle, because at a full stop while car is idling in neutral, engine revs perfectly clean no noise ticking or rattles through all revs. Noise only occurs while the car is in motion.

My first thought was engine “ping” due to low octane fuel. I ran premium fuel for a year, but it did not help. Noise has been an issue for a long while and increases each year. We have had this checked before but the problem is never found. I just want to make sure it is nothing serious.

Thanks for your time,

Derek
Sorry to resurrect a very old thread but did you/does anyone know what this is? My 06 WRX is doing exactly the same. Any help much appreciated
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Old 15 Apr 2011, 10:59 AM   #3 (permalink)
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Re: Loud Ticking-Rattle

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Sorry to resurrect a very old thread but did you/does anyone know what this is? My 06 WRX is doing exactly the same. Any help much appreciated
Hi,

have a look at this thread. Really annoying rattling noise !
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Old 05 Aug 2011, 06:23 PM   #4 (permalink)
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Re: Loud Ticking-Rattle

Hi ibanezvaio & Derek. Did you guys manage to solve this rattling problem? I have a similar rattle problem when accelerating medium to hard around 2500 to 3000 rpm and goes away. Light acceleration doesn't rattle. However it only occurs in 1st & 2nd gear. It also happen under heavy load like on a hill seem to rattle a bit more. Some days, I don't get any rattle but most days, there is some rattling.

Would appreciate if you guys or anyone else can advice of possible causes & solution.
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Old 05 Aug 2011, 10:05 PM   #5 (permalink)
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Re: Loud Ticking-Rattle

Hi

Well mine is still doing it-not tried locating it as it could be a nber of things. Most common is probably a small hole in the exhaust somewhere.

Have you tried locating where it's coming from?
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Old 06 Aug 2011, 11:22 AM   #6 (permalink)
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Re: Loud Ticking-Rattle

I can't seem to find anything lose. Will get the mechanic to check it out at the next service.
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