what tools do I need to do a compression test on 04 sti?

[javasti2004]

what tools would i need to do a compression test on an 04 sti

spark plug thread dimensions?

socket size?

[jwebsta32]

A ratchet
Spark plug socket
Maybe an extension
Compression tester
some way of killing spark or fuel.

i bewieve thats most of it

[javasti2004]

A ratchet
Spark plug socket
Maybe an extension
Compression tester
some way of killing spark or fuel.

i bewieve thats most of it

i should be good if i just disconet all the coils

i just didnt know if i was going to need like a 10mm or 12mm but ill probly bring both to be safe.


any idea what the thread pitch is for the compression tester?

what size the spark plug socket size is?

[squeethebee]

Coil packs are 12mm. There is a single fuse you can pull IIRC.

ed

[javasti2004]

Coil packs are 12mm. There is a single fuse you can pull IIRC.

ed

under hood or dash?

[-=Lobstah=-]

dash
#11 IGN - 15 amp fuse

[javasti2004]

dash
#11 IGN - 15 amp fuse

thanks

[Demetry]

thanks


Andrew, the IGN fuse is all you need to pull. I did my test alone in about an hour total. Think you need to have the car up to temp more so than not too.
Let me know if you need help.

[javasti2004]

Andrew, the IGN fuse is all you need to pull. I did my test alone in about an hour total. Think you need to have the car up to temp more so than not too.
Let me know if you need help.


i pulled 11 fuse i think it was cranked it over it didnt start so i continued the test i tested all of them i didnt do it warm and im ok with that they tested at 130 all 4 and im good with that too. 130 according to exeter subaru is normal anything lower isnt bad but it should be good as long as there all withing 5 lbs so 130 on a cold motor i think is good plus my guage could be slightly off too test went good papers are signed pick it up morrow night after work!

[shtbxr22]

if you didn't do it warm, then those numbers are ok. you didn't have to pull a fuse though. you can just press the gas to the floor and hold it there before turning the ignition on, and she'll crank forever without giving fuel. you should be holding it to the floor anyway to get all the air in you can.

[Alpine.Star]

When I did my 03 wrx motor I did it cold without holding the gas to the floor and got ~125 on all 4

[DHGurs]

You're confusing CFED with the OP. This car never had NOS

[javasti2004]

this motor isnt the one with nos i would never buy a car that i knew ran it in it even if it was built

[javasti2004]

im happy with the 130 psi in all cylinders cold motor getting a spec stage 3 clutch on wed

[StiXXX]

Standard: (142-171psi)
Difference beween cylinders: 7psi or less

From NASIOC, quoted from "the manual"

[javasti2004]

when i wnet to exeter they told me anything under 130 isnt bad but not the best. my guage could of been off and the motor was cold and when i did it they were only 2lbs between the 4 cylinders

[Alpine.Star]

It's also standard to do it while the engine is hot and have the throttle held open too.

[shtbxr22]

Standard: (142-171psi)
Difference beween cylinders: 7psi or less

From NASIOC, quoted from "the manual"

funny.....that's what i said. quoted from memory. :lol:

[squeethebee]

funny.....that's what i said. quoted from memory. :lol:

Yeah, but you have that book read to you to fall asleep everynite!

ed

[shtbxr22]

Amen brotha'!!!

[StiXXX]

130 = Tired = Time to start looking for a new motor.

[squeethebee]

130 when cold = not as bad as 130 when warm.

ed

[StiXXX]

130 when cold = not as bad as 130 when warm. ed

...But still on its' way OUT.
And adding any power mods will just hasten its' demise, toot-sweet.

[shtbxr22]

i beg to differ stixxx. 130 cold is not on it's way out.

[civic si hb]

i beg to differ stixxx. 130 cold is not on it's way out.


X2

[squeethebee]

Well technically he is right, all motors begin to break down from the first time they are started...

ed

[javasti2004]

Well technically he is right, all motors begin to break down from the first time they are started...

ed


and you begin to die when you are born lol

[squeethebee]

Exactly!

ed

[javasti2004]

im happy with the numbers and besides the car is already in my garage a little late now lol

[RCKSTR]

im happy with the numbers and besides the car is already in my garage a little late now lol

And that's all that really matters now :up:

[javasti2004]

hello 18g after clutch and dp and ewg of corse lol