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Old 03-08-2011, 10:49 AM   #1
fourdown
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Member#: 230408
Join Date: Nov 2009
Location: Illinois
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2006 Impreza 2.5i

Default Oil pressure switch location?

The other day I cold started my car and heard like a low taping or maybe a knocking noise. It did it between idle 700-800 rpms to a 1000 rpms, after that the noise is gone. I drove my car slowly to my house and got it in the garage to see if I could recreate the noise but didn't had luck.
Anyway i got an oil pressure gauge and want to make sure which on is the oil pressure switch. Can anyone confirm me if it's the one almost under the alternator. I have a 2006 Impreza 2.5i.

Thanks, any help would be much appreciated, I'm a little concern for the noise. It doesn't increments with rpm. In fact it disappears after 1000 rpm and you can't hear it on idle, just in between.
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Old 03-08-2011, 04:25 PM   #2
yarrgh
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2001 2.5RS
Black Diamond Pearl

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yes, it's under the alt. does this noise happen even if it's warm started?
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Old 03-08-2011, 05:18 PM   #3
fourdown
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Quote:
Originally Posted by yarrgh View Post
yes, it's under the alt. does this noise happen even if it's warm started?
Actually I heard the noise again today. It's very dificult to recreat because
it only does it between idle and 1000 rpm. If you go over 1k it can't be heard. And the problem is that my car id throttle by wire so I have to rev it from inside the car and can't figure out if it's from the block or the timing belt area like I've been hearing people talk about.
Any help with a similar problem would be much appreciated.
Thanks
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Old 03-08-2011, 08:19 PM   #4
blackfang
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2007 Legacy 2.5i SE
98 Z/28, VN 900 custom

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Ok, but do you hear this only when the engine is cold? How many miles?
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Old 03-08-2011, 08:28 PM   #5
Jessekrs123
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Are you sure it's not just normal valve train noise or maybe an exhaust leak? Subaru valve trains are rather loud.
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Old 03-08-2011, 08:33 PM   #6
blackfang
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98 Z/28, VN 900 custom

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^ especially when cold. I have heard some that were close to a damn deisel engine...lol
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Old 03-08-2011, 09:08 PM   #7
SiouxBe1
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1991 Legacy L+AWD BJ
White

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probably a sticky HLA (aka sticky valve lifter)
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Old 03-08-2011, 09:14 PM   #8
fourdown
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Quote:
Originally Posted by blackfang View Post
Ok, but do you hear this only when the engine is cold? How many miles?
Actually I drove a couple of miles today. I had to do some stuff today and even when the car was at normal temperature and drove it for a while I could hear it from time to time. So no, not just in cold. Actually the first time I heard it, it was a very cold day and it was more noticeable It's just difficult to recreate and is a low noise.
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Old 03-08-2011, 09:16 PM   #9
fourdown
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Quote:
Originally Posted by Jessekrs123 View Post
Are you sure it's not just normal valve train noise or maybe an exhaust leak? Subaru valve trains are rather loud.

No, it's not a valve train noise. I know what your saying and I've heard mine, but it's not the same noise.
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Old 03-08-2011, 09:20 PM   #10
fourdown
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Today I drained my engine oil, but didn't found anything. At least nothing that I could see on a simple view. Since i got my drain pan really clean before draining the oil I got a magnet in the oil, but nothing came out of it.
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Old 03-08-2011, 11:27 PM   #11
RaceFaceXC
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2007 No YELLING
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Quote:
Originally Posted by SiouxBe1
probably a sticky HLA (aka sticky valve lifter)
Except the ej 253 has solid with rollers
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