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Old 10-11-2008, 05:44 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:

Last edited by txl146; 07-29-2009 at 10:02 PM.
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Old 10-11-2008, 05:44 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, 05:57 PM   #3
Jubert69
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thanks!! will try soon
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Old 10-11-2008, 06:02 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, 06:41 PM   #5
sidewayz
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you forgot a huge part.

throttle to the floor
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Old 10-11-2008, 06:43 PM   #6
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I mentioned above, ".... with wide open throttle..."
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Old 02-04-2009, 10:59 PM   #7
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Quote:
Originally Posted by txl146 View Post
I mentioned above, ".... with wide open throttle..."
why do you need to do it in WOT?? there's no real need for this imo

thats why you crank it 5-6 times to get the compression test.

imo your fouling your spark plugs when u do this. *good chance*

just my two cent

great write up tho.
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Old 02-05-2009, 12:22 AM   #8
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Quote:
Originally Posted by o3WRXTC View Post
why do you need to do it in WOT?? there's no real need for this imo

thats why you crank it 5-6 times to get the compression test.

imo your fouling your spark plugs when u do this. *good chance*

just my two cent

great write up tho.
oh boy.
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Old 02-05-2009, 01:32 AM   #9
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Quote:
Originally Posted by o3WRXTC View Post
why do you need to do it in WOT?? there's no real need for this imo

thats why you crank it 5-6 times to get the compression test.

imo your fouling your spark plugs when u do this. *good chance*

just my two cent

great write up tho.

wow...just wow.

LOL, yup, you can foul your plugs going WOT.

Better put these suckers far away then..



I immediately thought of this after reading that.

http://forums.nasioc.com/forums/show....php?t=1123616
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Old 02-05-2009, 10:55 AM   #10
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Quote:
Originally Posted by Magnum626 View Post
wow...just wow.

LOL, yup, you can foul your plugs going WOT.

Better put these suckers far away then..



I immediately thought of this after reading that.

http://forums.nasioc.com/forums/show....php?t=1123616
BWAHAHAHAHAHAHAHAAHAHAA!!!!
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Old 02-05-2009, 02:51 AM   #11
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Quote:
Originally Posted by o3WRXTC View Post
why do you need to do it in WOT?? there's no real need for this imo

thats why you crank it 5-6 times to get the compression test.

imo your fouling your spark plugs when u do this. *good chance*

just my two cent

great write up tho.
Like has been stated above already... the plugs are out of the car.

Secondly, you should still go WOT with the throttle just to get the throttle open to allow air to be less hindered going into the motor.

Thirdly, you just need to disconnect the brown wiring harness below the glove box right next to the door. This contains the fuel pump power etc... unplugging this is like turning the pump off so that you don't wash your cylinders with gasoline and thin out your oil.

Nuff said... This resolves any nonsense about any "clear flood mode" and "standard modern EFI operation" crap.

(And it takes like 5 seconds to unplug/plug it in.)
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Old 03-27-2009, 05:09 PM   #12
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Quote:
Originally Posted by o3WRXTC View Post
why do you need to do it in WOT?? there's no real need for this imo

thats why you crank it 5-6 times to get the compression test.

imo your fouling your spark plugs when u do this. *good chance*

just my two cent

great write up tho.
You are most certainly entitled to your wrong opinion...

This is how a compresson test is done...by the book...period.
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Old 10-11-2008, 06:47 PM   #13
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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, 06:52 PM   #14
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Im guessing so all the air can get in.
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Old 10-12-2008, 01:32 AM   #15
WRXDK
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Wouldn't you need to remove the fuel pump relay also?
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Old 10-12-2008, 02:45 AM   #16
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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, 09:18 AM   #17
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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 10-13-2008, 05:20 AM   #18
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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 04-07-2011, 01:02 AM   #19
minus500
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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...
Definitely pull the fuse or disconnect the harness. You don't want to wash the walls.

OP, good write-up.
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Old 10-12-2008, 01:43 AM   #20
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2 man job, or does the gauge peak hold?
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Old 10-12-2008, 09:24 AM   #21
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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, 06:57 PM   #22
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, 07:12 PM   #23
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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 10-12-2008, 11:09 PM   #24
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Where'd you pick up the compression tester?
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Old 10-12-2008, 11:57 PM   #25
txl146
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I picked one up from advance auto part.
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