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Old 08-08-2019, 05:09 PM   #1
maxbr7t
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Default 05 WRX Leakdown test issues

I have a blinking CEL misfire that was showing all cylinders and now only showing 4. I'm trying to diagnose the issue.

I'm trying to perform a leakdown test, I got the engine to TDC (via Cam markings) and when I turn up pressure(to 70psi) it just rotates the engine. So I tried holding the crank pulley bolt steady with a ratchet and when I hit about 60psi it just unscrewed my crank bolt. Either way, the leak down tester was showing 100% leakdown the entire time and I can hear air pissing out the entire time.

I made sure I was on compression stroke

I made sure my hose is seated snug into the cylinder

No matter what, air is pissing out from somewhere around the cylinder when I'm turning up pressure.

Can someone tell me what I'm doing wrong?
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Old 08-08-2019, 05:26 PM   #2
Waddlz
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its easier with two people. You could brace the crank pulley somehow but I've never tried by myself.

but you need to hold the crank bolt. Use a breaker bar
Every time I do one I use a breaker bar and have someone else check it for me. Never had the crank bolt come undone.

I usually slowly turn the crank clockwise until I get almost 1:1 pressure ratio, around 10 or 15 psi.

Then I hold it there and have that person crank it til it hits ~100. its going to be a PITA to hold but you only need to do so until 90 psi. but if you are truly getting 100% leakdown you have a cracked ringland or bad valve.
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Old 08-08-2019, 06:16 PM   #3
maxbr7t
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Quote:
Originally Posted by Waddlz View Post
if you are truly getting 100% leakdown you have a cracked ringland or bad valve.
I'm going to try a different cylinder tomorrow and if it I have the same issue I'll just rip this stupid engine out and visually inspect the head.
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Old 08-08-2019, 10:11 PM   #4
subaru_gc8
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did you do a compression test first? why do you need to do a leakdown?
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Old 08-09-2019, 03:16 PM   #5
maxbr7t
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Quote:
Originally Posted by subaru_gc8 View Post
did you do a compression test first? why do you need to do a leakdown?
Didn't do a compression test yet. I started with the leak down, I was thinking it might be a blown headgasket
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Old 08-14-2019, 07:59 AM   #6
User_Name_1944
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Any answer on this? Bad rings? Bent valves? Head gasket?
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Old 08-14-2019, 09:52 AM   #7
subaru_gc8
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Quote:
Originally Posted by maxbr7t View Post
Didn't do a compression test yet. I started with the leak down, I was thinking it might be a blown headgasket
if its a blown head gasket the signs are different. when subarus blow a headgasket it pushes exhaust gases into the coolant passages and it pukes it out of the over flow. for that you dont do a leakdown you do a block test.
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