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10-13-2008, 08:10 PM | #26 |
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NWIC
Location: Washington
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The only problem I had when trying my compression test was getting the compression tester threaded into spark plug threads. I couldn't get it to line up and thread in. I only got 1 cylinder done.
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10-13-2008, 10:20 PM | #27 |
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Member#: 32459
Join Date: Feb 2003
Chapter/Region:
Tri-State
Location: NY
Vehicle:02 WRX VF34 (SOLD) Junior Tuned 301whp |
I had similar problem on cylinder 4, but it finally worked.
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10-13-2008, 11:48 PM | #28 |
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Join Date: Dec 2007
Chapter/Region:
RMIC
Location: severance, Colorado
Vehicle:2013 xv crosstrek orange |
nice write up...i did the same thing works great
150+ is great for an 02 where 170 is brand new i got 140 on all 4 cylinders but im running .040 piston to wall clearances. with .022 ring gaps. and i did mine with the engine some what warm. not hot |
10-13-2008, 11:59 PM | #29 |
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W. Canada
Location: canada
Vehicle:2003 wrx blue |
^your lucky!
i just did my test a few weeks ago, my numbers came out cylinder 1= 95 cylinder2=90 cylinder3=136 cylinder4=140 ha! time for my 2.5 motor to go in i guess lol |
10-14-2008, 12:00 AM | #30 |
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Join Date: Apr 2007
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W. Canada
Location: Calgary, Alberta
Vehicle:Keep It Sleazy |
Great write up!
What are the signs of bad compression? (If you could possibly tell without a compression test) |
10-14-2008, 12:44 AM | #31 |
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Join Date: Dec 2007
Chapter/Region:
RMIC
Location: severance, Colorado
Vehicle:2013 xv crosstrek orange |
mis fires, because of blowby. hesitation. loss of power.
list goes on it really depends on how low your compression is if its 90 psi you may get a misfire here and there. if its 20 like mine was the car doesnt want to run. anything 100 or less is time for a rebuild |
10-14-2008, 12:47 AM | #32 |
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Join Date: Jan 2008
Chapter/Region:
TXIC
Location: Oklahoma City, OK
Vehicle:2002 Subaru WRX Aspen White |
i am about to do mine next weekend when i replace the sprak plugs and am nervous about it since i have just passed the 120,000 mile mark in my 02 stage 2 wrx but that being said the motor still feels strong and has been maintained well
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10-14-2008, 12:52 AM | #33 |
Scooby Guru
Member#: 32459
Join Date: Feb 2003
Chapter/Region:
Tri-State
Location: NY
Vehicle:02 WRX VF34 (SOLD) Junior Tuned 301whp |
I have over 90k miles on my car - 50k miles at 220whp level and 20k miles at the 282whp level. I always baby my car so no wonder why compression numbers came out over 150 each cylinder.
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10-14-2008, 02:30 AM | #34 |
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advanced auto is the best out of the two. IMO Great write izzy
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10-14-2008, 03:39 AM | #35 |
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PRSIC
Location: Jolo,Sulu
Vehicle:2010 GiBO TEODORO PRESIDENT |
nice write up, will definitely do this on my car; car has 144Kmiles on clock bonestock except axelback,runs strong no hesitation but getting the misfire code lately after replacing the clutch and put in a LWFW 12lbs., planning on goin stage2/VF43.
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10-14-2008, 06:25 PM | #36 |
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Member#: 32459
Join Date: Feb 2003
Chapter/Region:
Tri-State
Location: NY
Vehicle:02 WRX VF34 (SOLD) Junior Tuned 301whp |
Thanks guys. Check out my other DIY write ups.
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10-29-2008, 07:52 PM | #37 |
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Join Date: Feb 2006
Location: Twin Cities, MN
Vehicle:2005 STI OBP |
So what happens if you forget to warm it up?
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10-29-2008, 10:17 PM | #38 |
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Member#: 108163
Join Date: Feb 2006
Location: Twin Cities, MN
Vehicle:2005 STI OBP |
well, nothing apparently, I got ~150 psi on cylinders 1, 3, & 4 on a cold engine. Tried twice on cylinder 2 and could only get 130 psi.
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10-29-2008, 10:52 PM | #39 |
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SCIC
Location: (818) 300k+ ej205 ppg 5mt
Vehicle:02 vf30 pnp wagon silver and cf |
I have wanted to know diy on this. Thanx
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10-29-2008, 10:55 PM | #40 |
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Chapter/Region:
NESIC
Vehicle:2010 legacy gt |
152, 155, 155, 152.....
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10-29-2008, 11:57 PM | #41 |
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Chapter/Region:
E. Canada
Location: Mississauga,ON
Vehicle:2002 WRX Black |
You're going WOT without an air filter on!!!... am I missing something here???
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10-30-2008, 01:24 AM | #42 |
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Member#: 90920
Join Date: Jul 2005
Chapter/Region:
Tri-State
Location: Westchester, NY
Vehicle:2005 2.0FPGREEN 6SPD 2002 bugeye Vf39 |
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10-30-2008, 08:28 AM | #43 | |
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Chapter/Region:
South East
Location: Brunswick, GA
Vehicle:2003 Stg 2 Bug Wagon Sonic Yellow |
Quote:
As far as the WOT thing, an engine is an air pump. I know that I may not have the best description, but I have a handle on it. If you do a comp test with the throttle plate closed, you are asking the cylinder to give you a pressure reading while operating in somewhat of a vaccum. If the throttle plate is open, then you are providing a direct, unobstructed air path to get an accurate cylinder compression test, vs. the vaccum situation with the throttle closed. And as far as doing this with the air box off, this is a non issue. You are not running the car, just doing a check with short engine rotations. You are not going to ingest any dirt into the turbo that will cause harm. If this is really a concern, then you probably should not do this during a sand storm. Cheers, Travis |
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10-30-2008, 11:13 AM | #44 | |
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NWIC
Location: PDX
Vehicle:2009 OXT 5-spd 2011 STi hatch |
Quote:
Thanks for the very nice write-up, TXL! |
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10-30-2008, 11:31 AM | #45 |
Scooby Guru
Member#: 32459
Join Date: Feb 2003
Chapter/Region:
Tri-State
Location: NY
Vehicle:02 WRX VF34 (SOLD) Junior Tuned 301whp |
Thanks...
I've been getting several PM about where I got the tester from. I got mine from advance auto part for $25. |
10-30-2008, 02:33 PM | #46 | |
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Member#: 32669
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SCIC
Location: Woodland Hills
Vehicle:2007 2.34LR, EFR7670 LINK G4+ hybrid STi |
Quote:
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10-30-2008, 07:16 PM | #47 |
Scooby Specialist
Member#: 129231
Join Date: Oct 2006
Chapter/Region:
Tri-State
Location: Long Island NY
Vehicle:2005 wrx cgm |
nice write up, i did my comp test a week or so ago, and had good numbers, every cylinder was between 160 and 165psi
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10-31-2008, 06:49 AM | #48 |
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Join Date: Apr 2008
Location: FoCo
Vehicle:2010 S4 Gray |
Nice write up! I did this last week actually, with the Auto Zone gauge as well. Definitely worth the 25 bucks.
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10-31-2008, 08:22 PM | #49 | |
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MWSOC
Location: MKE
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Quote:
bolded the pertinent part. |
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11-01-2008, 04:26 PM | #50 |
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Join Date: Jul 2006
Chapter/Region:
BAIC
Location: San Jose, CA
Vehicle:2004 WRX Blouch 20G |
2004 WRX
60,000 miles Rebuilt at 50,000 miles with thick 1.2mm head gasket (long story, don't ask why) Stage 2 + headers, intake, 06wrx injectors, catless TBE Results: 1: 137 2: 144 3: 138 4: 142 How does this look keeping in mine that I have the thick head gasket? |
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