This is on my friends car and from an AIM conversation this is what i know. IM posting this cause his computer crashed and was telling me this from his g/f's computer. What could be the problem?

i went to the tuner today and they said im not getting compression
in cylinder 1 then they did a compression test and they said im getting about 180
which they said was low but its not that bad. i think regular is like 200 or so. Then they chekced the spark plugs and the new ones i got were already fouled
and they said since it was fouled already, it shows that atleast some fuel was getting to it and they checked the coil pack ,and that wasnt it and then they checked the injector wires for a bad ground
and they said it wasnt that.

well they checked the injector wires and they say they are good.
they said maybe its a bad AEM EMS or maybe its a bad injector
but its really a toss up at this point.

We're stumped

This was taken to Church automotive which i heard does a lot of S2k's in so-cal




Modified by teknoracing at 10:08 PM 1/2/2007

 

If his comp is 180 in one cylinder. Its hurt. Leak down test will help you determine whats hurt.

 

thanks man. bump for more opinions

 

What where the compression numbers of the other cylinders?

 

i had a problem similar to this, but different in the same of course its never the same but, i was cruising the other night taken the GF home and i was going about 30 mph and my car went rich and cutt off, what happened was the injector got stuck wide open, so i got them serviced and what not, im on ems as well but you may have gotten ring wash (i believe thats the term not sure) how i was told to much gas in the cyl. can destroy the piston rings, but of course thats what i was told, im not good on the technical end i just build umm but now in a result the injector got stuck again as i stepped into it second gear blew out spiked the rev limiter cause it couldnt cut fuel dropped a valve and destroyed number 4 so i now have 0 compression, if your having an injector issue get new ones they might be expensive but not worth loosing your motor, witch is the moral of this book a just wrote

 

s2k is pretty high compression not sure on the exact C/R

but 180 is low for a motor with a high C/R

BUT.....not completely dead, just seems like its on its way out.....

 

Check compression in other cylinders as well. If it's just narrowed down to one cylinder, perform a leakdown test as well.

 

if you are running an AEM and have it REAL rich you can wash you piston rings and hurt compression...

180 is definatly low and worth concern... ditto, what were other numbers? that can narrow it down to just one cyl or open up other possibilities...

(bad AEM, and any of the coil/spark problems can be what caused the loss in compression, but fixing any of that won't fix compression!)

 

well you can try a wet compression test, that would rule out the ring. pour like a teaspoon of motor oil in the spark plug bore and take another reading. if its the ring thats bad your comp will rise a good bit.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by m R g S r &raquo;</TD></TR><TR><TD CLASS="quote">s2k is pretty high compression not sure on the exact C/R

but 180 is low for a motor with a high C/R

BUT.....not completely dead, just seems like its on its way out.....</TD></TR></TABLE>

He installed a 3mm headgasket not sure how much that lowers the compression. We are going to do a compression test on it later today to find out all the numbers. IM going to his house later, i cant believe they didnt give him all 4 numbers

 

just a guess, but with a 3mm I would think 180 is close to normal... check the others

I don't know first hand, but I would guess thats not too far of norm.

consistancy is the biggest importance...

 

185 182 185 183

across all 4 cylinders

 

Your compression numbers are even across the board, I think you are ok. I wouldnt worry about the actual compression number as oppose to the difference between the other cylinders.

 

normal compression numbers on an S2k motor are around 240..but I didn't think just a head gasket would lower compression that much..but what do i know...i drive a civic....

 

WOW, you guys. To the person that started this. You only told us 1/2 the story. If you would of said that you had a 3mm headgasket we would of known it was ok. 3mm is a HUGE amount when it comes down to c/r. You went from 11-1 to 9-1 c/r.
your car is fine