they are all 150. the tester is 25 years old tho! and idk if i did it totaly right. something is wrong. cause they cant be all fucked up. btw im getiing code 71 and 72, at idle only. i have the o2 off(no choice till i get my exhuast fixed) and have a vacume leak

 

I'd check using a newer compression tester. My b16a2 was 195 across the board.

 

I've never seen a compression test actually done, would anybody like to explain it? Yes, I know what compression is, yes, I know what it should be.....I'm j/w 'cause I've never seen anybody actually do it..

 

http://www.c-speedracing.com/h...t.php
there! now back to me. i dont belive it, because im getting the same thing in all cylinders

 

Ok, let me explain how you do it.
1. Warm up engine if you already havent.
2. Remove all spark plug wires.
3. Remove ALL spark plugs.
4. Remove Blue 15A ECU fuse(Fusebox located on upper left in engine bay).
5. Screw in the Compression tester hose into a cylinder and attach the guage.
6. Crack the engine 5 times(You can hear it) with foot all the way down on the throttle.
7. Repeat steps 4 and 5 for the other cylinders.
8. Put the ECU Fuse, plugs, and wires back in.

Your numbers should be within 20% I believe.


Modified by 99FBPSi at 10:21 PM 4/19/2006

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 99FBPSi &raquo;</TD></TR><TR><TD CLASS="quote">Ok, let me explain how you do it.
1. Remove all spark plug wires.
2. Remove ALL spark plugs.
3. Remove Blue 15A ECU fuse(Fusebox located on upper left in engine bay).
4. Screw in the Compression tester hose into a cylinder and attach the guage.
5. Crack the engine 5 times(You can hear it) with foot all the way down on the throttle.
6. Repeat steps 4 and 5 for the other cylinders.
7. Put the ECU Fuse, plugs, and wires back in.</TD></TR></TABLE>
thats exactly what i did

 

coudl a vacume leak do anything with this?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by v-tec maz &raquo;</TD></TR><TR><TD CLASS="quote">coudl a vacume leak do anything with this?</TD></TR></TABLE>
It would definately not hurt to test your vacuum. Vacuum test's are VERY underrated but you would be amazed at what they can tell you.

 

btw, if i have a leak in one of my vacume lines, could it result in missfiring at idle? or atleast making the CEL go on?

 

omg, I didn't even know there was a vaccum test...I got to get out of this town more....in all the time I've spent down there, I've seen teh compression test done, just didn't know what it was :-P Yeah, I've done them before (pumped the gas....worddddd), but I didn't even know there was a vacuum test, I g2 get that done to my probe to see why my idle's all over the charts

Thx for the link & help

 

 

 

could timing affect my compression as well?

 

sounds like a bad tester, all the same would indicate that its good, but i would definately get a new tester or atleast gauge for it.

 

was your engine warm when you did that test? A cold engine will yield low compression.