Compression procedure

[max240se]

hi all, first of all, i recently acquired this s14 se...this car rocks.....mine is stock form all around but i like the way this car handles the curves and turn.

now to my request.....could someone please post a cylinder compression write-up???

thanks for the help.JB

[onosqv]

everyone get's 1 free help from me... cuz I'm nice like that.

zerothread?id=100769

[Bronze MFP]

Thats for a leakdown test, a compression test is a lot easier. The leakdown test isnt really needed unless you get low compression test numbers.

steps,

1 Relieve fuel pressure/ disable fuel system:pull your fuel pump fuse. (it's labled in your under-dash fusebox)After the fuse is pulled, start the car... it might idle for a second then die out.

2) pull all the spark plugs

3) hook up the compression tester and crank the engine over a few times

4) repeat step 3 for all cylinders, don't forget to record your readings

I believe compression should read out around 179psi.

If compression numbers are under 150, or there is a difference of more than 10-15psi, there is something wrong.

If your compression numbers are high, you have carbon buildup. Run some seafoam through.

[max240se]

hey, thanks for the quick reply!

[max240se]

thanks for the reply too....but don't i have to disconnect something in the distributor????

[onosqv]

Thats for a leakdown test, a compression test is a lot easier. The leakdown test isnt really needed unless you get low compression test numbers.

"Why settle for plain when you can be crunchy?" .

O, just a thought: shouldn't you hold the gas pedal at WOT when cranking - otherwise your readings may be lower than they actually are? I just remember that from a while back when I was doing mine.

[onosqv]

thanks for the reply too....but don't i have to disconnect something in the distributor????

I think that's covered in "pull all the spark plugs" - that way you car doesn't actually start when you crank it... At least that's what I did.

[Bronze MFP]

DOH, yeah hold pedal at WOT... i forget to do that when I actually do my comp. test too... sheesh

[FliMSiCaL]

yeh, wot is a must, unless you like looking at 125 ish psi all day

[Bronze MFP]

lol, yeah 125 is about what it turns out to be. I find that out the hard way every time I do a comp. test