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Old 12-12-2013, 12:29 PM   #1
TBolt1003
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Member#: 302874
Join Date: Dec 2011
Location: Media, PA
Vehicle:
1995 Impreza L wagon
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Default HLA Noise returns

I posted about a month ago regarding the HLA's in my 1995 2.2 Impreza. After recommendations, I replaced the HLA's on the passenger side. Initial findings were (1) of them was not holding pressure. Seeing I was going to be that far into the engine, I decided to replace all (4) of the intake HLA's, which upon disassembly the second time around, I found all (4) to be compressable. The exhaust HLA's were solid and could not be compressed. After the repair, the noise remains. The (4) new parts came directly from Subaru. They primed fine before I installed them and were holding pressure on my work bench. Is it possible the exhaust HLA's are bad, even though they were firm when I took the engine apart? I was thinking of maybe swapping the intakes for the exhausts and seeing if that makes any difference.

The engine runs great and has power, so I feel the valves are opening and closing fine. I read somewhere there may be a blockage in the port that feeds oil to the HLA's. If this port were blocked, wouldn't the exhaust units be compressable, as well, if they weren't getting any oil?

Engine has 119,000 miles on it. I've owned the car since 87,000 miles and change the oil and filter every 5k. Any thoughts or ideas on this? I'm all ears. Thanks!
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Old 12-12-2013, 03:22 PM   #2
subi400
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Join Date: Jul 2009
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Location: Hayden, ID
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1996 Impreza outback
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Default

Quote:
Originally Posted by TBolt1003 View Post
I posted about a month ago regarding the HLA's in my 1995 2.2 Impreza. After recommendations, I replaced the HLA's on the passenger side. Initial findings were (1) of them was not holding pressure. Seeing I was going to be that far into the engine, I decided to replace all (4) of the intake HLA's, which upon disassembly the second time around, I found all (4) to be compressable. The exhaust HLA's were solid and could not be compressed. After the repair, the noise remains. The (4) new parts came directly from Subaru. They primed fine before I installed them and were holding pressure on my work bench. Is it possible the exhaust HLA's are bad, even though they were firm when I took the engine apart? I was thinking of maybe swapping the intakes for the exhausts and seeing if that makes any difference.

The engine runs great and has power, so I feel the valves are opening and closing fine. I read somewhere there may be a blockage in the port that feeds oil to the HLA's. If this port were blocked, wouldn't the exhaust units be compressable, as well, if they weren't getting any oil?

Engine has 119,000 miles on it. I've owned the car since 87,000 miles and change the oil and filter every 5k. Any thoughts or ideas on this? I'm all ears. Thanks!
I have a similar issue with my 98 L with the 2.2 from my 96 imp wagon. It has hla's and at least 1 or two on the driver's side head cylinder 4 has some problems.... The heads were rebuilt last year and the hla's were good then. Just showed up a bit ago with the really cold weather here...

I will be taking the driver's side rocker assembly off to see what is going on.

What oil have you been using? Were the small orange o-rings replaced on the hla's you replaced?
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Old 12-12-2013, 06:15 PM   #3
TBolt1003
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I've been using 5W-30 yellow bottle Pennzoil since I got the car. The new HLA's I bought from the dealership had the orange rings already installed. I simply primed them like they told me to and installed them.
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Old 12-21-2013, 05:48 PM   #4
TBolt1003
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Ok, really pulling my hair out now.

I pulled the passenger-side valve cover off this morning and all (4) intake HLA's were collapsed. The exhausts were fine. I pulled the rocker assembly off and primed the intake HLA's again, which were replaced with brand new units from Subaru less than a month ago. While I had the assembly on the bench, I did what I could to blow air through the oil feed openings and clean up the assembly the best I could. Seeing I've been having issues with the intake HLA's and the exhausts were nice and solid, I figured these are easy enough to take apart if I have to again, so I swapped the exhaust HLA's for the intakes and vise-versa (firm exhaust HLAs in the intake rockers and newly primed intake HLAs into the exhaust rockers). Everything seemed fine, so I put the engine back together and turned the key. She started right up and was purring like a kitten. No HLA tick at all. I let the engine idle for about 10 minutes and still no noise. After sitting for about 3 hours, I went out for an errand, and still no noise. When I went to leave my destination about an hour later, when the engine started, the tick was back, albeit not as loud as before. The engine still runs fine and has power, but this tick is driving me up the wall.

What am I missing? What could be causing the tick to return? It's only from the passenger side of the engine. I'm almost ready to go to a wrecking yard and pull a passenger side rocker assembly off a donor car and give that a whirl. I'm very self-conscious about my vehicles and until this tick is gone, I won't be completely okay. Anyone have thoughts...please???
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Old 12-22-2013, 01:57 PM   #5
geronimo81
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9psi on 91 No EM

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oil supply to the intake hla's must be somehow decreased. That is the only thing that explains it. I need to replace a bad hla in my outback too. I didn't want to pay $35 a piece though.
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Old 12-23-2013, 09:22 PM   #6
subi400
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Location: Hayden, ID
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1996 Impreza outback
Green

Default

What I am suspecting to be the issue like what was mentioned is a decrease in oil pressure/flow just a bit to the hla's that you were having issues with. I am going to take the rocker assembly out on my 2.2 driver's side head and see if I can see anything and then do a flush to see if anything comes out of the small oil passages. Will have to wait till my 96 imp wagon is on the road which could be another few weeks.

Something is very specific here but an issue fix it if I am thinking right.
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