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Old 10-11-2008, 06:44 PM   #1
txl146
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Default Easy DIY compression test with pics!

Spent 45 min performing compression test with $25 compression tester today.

2002 WRX with 90k miles
Mods: VF34 @ 19psi protuned 282whp/272wtq
JDM STI TMIC
Maddad v2 DP & whisper catback
One step colder NGK platinum plugs
Stock intake with K&N panel filter
German castrol oil

1. Remove stock intake box, etc:



2. Remove 12mm bolt in order to remove coil pack from each cylinder:




3. Remove spark plugs using 5/8" long socket with an extension



4. Coil pack and spark plugs removed:
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Last edited by txl146; 07-29-2009 at 11:02 PM.
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Old 10-11-2008, 06:44 PM   #2
txl146
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5. Pull ignition fuse
- Fuse remover is located next to battery:



6. Connect compression tester into each cylinder:



7. Now it's time to crank the engine with wide open throttle. Crank the engine 6 times.


8. Repeat the test for each cylinder and pray numbers come out good:





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Old 10-11-2008, 06:57 PM   #3
Jubert69
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thanks!! will try soon
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Old 10-11-2008, 07:02 PM   #4
txl146
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You're welcome. Make sure to pray before performing a test!

One thing I forgot to mention is:

Make sure your car is warm when performing a test.
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Old 10-11-2008, 07:41 PM   #5
sidewayz
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you forgot a huge part.

throttle to the floor
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Old 10-11-2008, 07:43 PM   #6
txl146
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I mentioned above, ".... with wide open throttle..."
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Old 10-11-2008, 07:47 PM   #7
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why do you crank with the throttle down? What difference does it make?
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Old 10-11-2008, 07:52 PM   #8
jrobinson
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Im guessing so all the air can get in.
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Old 10-12-2008, 02:32 AM   #9
WRXDK
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Wouldn't you need to remove the fuel pump relay also?
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Old 10-12-2008, 02:43 AM   #10
dome24
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2 man job, or does the gauge peak hold?
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Old 10-12-2008, 03:45 AM   #11
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Quote:
Originally Posted by WRXDK View Post
Wouldn't you need to remove the fuel pump relay also?
you can, but the fuel should just evaporate after you remove the tester.
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Old 10-12-2008, 10:18 AM   #12
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I would disconnect the fuel pump relay too. Something about raw fuel washing the cylinder walls and fuel dilution in the oil just sounds like bad ju ju to me....Great write up though! Now someone needs to make one for a leakdown test! Hint hint...
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Old 10-12-2008, 10:24 AM   #13
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Quote:
Originally Posted by dome24 View Post
2 man job, or does the gauge peak hold?
Yes, they hold peak.
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Old 10-12-2008, 07:57 PM   #14
03SubaruWRX
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Nice write up, can't wait to try it out for myself.
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Old 10-12-2008, 08:12 PM   #15
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good write up with good pics, may have to give this one a shot this week
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Old 10-13-2008, 12:09 AM   #16
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Where'd you pick up the compression tester?
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Old 10-13-2008, 12:57 AM   #17
txl146
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I picked one up from advance auto part.
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Old 10-13-2008, 12:58 AM   #18
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Thanks. I just did my plugs but I'll do this test when I replace them next year (copper plugs).
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Old 10-13-2008, 06:20 AM   #19
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Quote:
Originally Posted by stikboy9 View Post
I would disconnect the fuel pump relay too. Something about raw fuel washing the cylinder walls and fuel dilution in the oil just sounds like bad ju ju to me....Great write up though! Now someone needs to make one for a leakdown test! Hint hint...
The injectors need a ignition signal to fire so disconnecting the fuel pump relay is not really necessary.
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Old 10-13-2008, 09:45 AM   #20
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Thank you for this write-up! I need to do one of these soon.
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Old 10-13-2008, 01:38 PM   #21
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going wot at startup cuts fuel to the all cylinders, this is normal on al obd2 cars
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Old 10-13-2008, 02:17 PM   #22
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Quote:
Originally Posted by sorrowfulkiller View Post
going wot at startup cuts fuel to the all cylinders, this is normal on al obd2 cars


Quote:
Originally Posted by GDR View Post
The injectors need a ignition signal to fire so disconnecting the fuel pump relay is not really necessary.
So going WOT is not necessary either, correct?
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Old 10-13-2008, 04:11 PM   #23
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good write up! thank you
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Old 10-13-2008, 05:52 PM   #24
Jus Blaze
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Want to do one for me? Ill pay you = )
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Old 10-13-2008, 06:10 PM   #25
txl146
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as long as you buy me lunch, sure why not?
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