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Old 08-20-2012, 01:34 AM   #1
Scooby Newbie
Member#: 124705
Join Date: Sep 2006
Location: Winnipeg, Canada
2001 Outback Sport

Default Low compression on #4, buy new engine?

Engine: '01 EJ22

I swapped the engine in my Impreza Outback Sport only to find the new engine has bad compression on cylinder #4.


I adjusted the valve lash to .008 on intake and .010 for exhaust which didn't make any difference. I did a dry/wet test for cylinder #4 but there was only a 10-15 psi difference. I have not done a leak down test to find out exactly where I'm losing compression.

I can return the engine to the seller and get my money back or proceed with this one to find out where the problem is and how much effort it will take to fix. Do I even bother repairing or just find a new engine?
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Old 08-20-2012, 04:09 AM   #2
Scooby Newbie
Member#: 310744
Join Date: Feb 2012
Chapter/Region: NWIC
02 WRX


If the guy sold you a bad engine go after him.
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Old 08-20-2012, 08:13 PM   #3
Scooby Specialist
Member#: 318411
Join Date: Apr 2012
Chapter/Region: South East
Location: North Carolina
17 WRX


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Old 08-20-2012, 08:15 PM   #4
Scooby Specialist
Member#: 294461
Join Date: Sep 2011
Chapter/Region: NWIC
Location: Grass Pants, OR
2006 San Remo Wagon
Under construction


#4 is the notorious cylinder for burning valves.
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Old 08-20-2012, 09:19 PM   #5
Scooby Specialist
Member#: 216984
Join Date: Jul 2009
Chapter/Region: NWIC
Location: Coeur D Alene, ID
1996 Impreza outback


My 96 impreza wagon has lower compression in cylinder 4 as well by about 35 points or so. Stupid cylinder 4....

But yeah, go after the person you bought the engine from.
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