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Old 10-20-2019, 05:23 AM   #1
alro
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Default Compression test PSI. (05' sti)

I recently did a compression test on my 2005 sti. I have a misfire on cylinder one, and I already changed the plugs and coils so I did a compression test (cold engine). My gauge read 123-125 psi on all four cylinders, but I looked at others and they said they had around 150 psi which surprised me. The car is stock other than a K&N cold air intake with a perrin inlet tube and a killer B oil pan and pickup. Are these normal pressure readings?
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Old 10-20-2019, 10:33 AM   #2
Scuby04STi
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Member#: 328635
Join Date: Aug 2012
Chapter/Region: NWIC
Location: Portland*
Vehicle:
2004 STi GTX3076R
Rally Blue

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Those are fine, variance and leak down numbers are what are the main concern.
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Old 10-20-2019, 10:37 AM   #3
Khaeras
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Chapter/Region: Tri-State
Location: Upstate NY
Vehicle:
2015 STI
Red

Default Misfires cylinder 1

I've never actually had a problem with a spark plug or coil pack with every instance of misfire cylinder one. It's always been something unrelated to the obvious. One time it was corroded grounds another time it was tgv related. That code is like a wild goose chase.
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Old 10-20-2019, 03:32 PM   #4
alro
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Quote:
Originally Posted by Khaeras View Post
I've never actually had a problem with a spark plug or coil pack with every instance of misfire cylinder one. It's always been something unrelated to the obvious. One time it was corroded grounds another time it was tgv related. That code is like a wild goose chase.
How can I go about checking the connections and wiring?
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Old 10-22-2019, 03:39 PM   #5
stikid2005
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Join Date: Dec 2004
Chapter/Region: Tri-State
Location: Tri-State NJ
Vehicle:
2005 STI
Aspen White/Seibon carbon

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Quote:
Originally Posted by alro View Post
How can I go about checking the connections and wiring?
locate the 4 coil packs. Make sure they are tight. Check all the clip connections are secured. These cars as they get older tend to suffer from brittle plastic. check if the clips or broken and not firmly securing to the coil pack. Be careful you can break these easily but replacement clips can be purchased from IAG.

When chasing misfires make a list. go step by step and cross off what you did. when you fix the issue this will help you better diagnose future problems.
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