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Old 11-21-2017, 09:45 AM   #1
Scooby Newbie
Member#: 472151
Join Date: Aug 2017
Default 2005 Subaru sti 0 compression in cylinder 1

I was wondering if somebody could help me figure this out please? I bought this with 85k miles on it a few months ago with the intent to rebuild the motor with forged internals and other upgrades and what not. The problem was it would have a weird knock at idle. Probably a bad bearing or something o thought. Still it ran as good as you would expect it to. A couple weeks ago I was having grounding issues with the battery. I fixed it and when I started it it was throwing cylinder misfires and was running terrible. I ran a compression test on the cylinders and 2, 3, and 4 were all good. The thing is I was seriously getting 0 compression from cylinder one. I did the test 5 times and got the same thing every time. I decided it was probably time to rebuild anyways. Pulled my engine and heads and nothing was obvious. Valve seats look fine nothing's burnt which was what I thought it would be. Then pulled the pistons and the rings were still intact. Now if I was getting 0 compression and take the block apart shouldn't this be an obvious thing to find for air to be leaking that bad. Anyways before I pulled the pistons I flipped the engine to where I could fill cylinder 1 with oil. I let it sit all night and it didn't leak any oil I did the same with the head on the valve seats and nothing leaked. I have all the parts I need to just about finish the rebuild and put it back in, but I don't really want to do that until I know I'm not going to have the same problem I had when I pulled it out.
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