DREYKO

ok on both rotors I got 60psi if I left the valve closed, with the valve open I saw about 45-50psi.

this is a s5 n/a motor, pulls pretty strong, dyno'd 165 whp about 6 months ago and it "feels" just as strong.

It also starts pretty easy, It'll flood sometimes, but its also on a s4 ecu+ extra fuel for starting.

so whats up with this?

arghx

iTrader: (3)

is your battery fully charged?

do you have it at WOT? read kevin landers' writeup on his site

DREYKO

no it was not at wot
the battery was charged.

how much of a difference can wot make?

classicauto

iTrader: (3)

Do it again and you'll see

Also, was this taken while warm? and from which plug hole?

DREYKO

yes warm engine and leading hole

Spectator

iTrader: (1)

ALWAYS take it at WOT.


...and of course, remove the EGI fuse. But I am sure you knew this.

Anyhow, compression tests are evil. If it starts fine cold or hot, all is fine.


Spec.

classicauto

iTrader: (3)

Compression is supposed to be taken through the trailing as per FSM.

RETed

Throttle must be propped fully open.
BOTH trailing spark plugs must be removed - Mazda spec uses trailing.
If you're going to insist on leading, then the readings will be slightly lower.


-Ted

DREYKO

so you need to do this using the trailing plug holes? but you leave the leading plugs in the motor right?

classicauto

iTrader: (3)

yes, only remove the trailings

eriksseven

iTrader: (6)

How many miles are on the engine?

dazed01

And disconnect the CAS, it's never good getting zapped when messing around with your car.

lduley

iTrader: (1)

but that takes all the fun out of working on a car

especially if you have a friend that doesn't know better

dazed01

I was diagnosing an obd1 integra for a dead cylinder when I leaned over the engine bay and my arm brushed the cold air intake on it, next thing I knew I was picking my *** up off the floor The intake had rubbed a hole in #1 plug wire shorting it out. Those things have a hell of a coil in them.

lduley

iTrader: (1)

I was checking for spark on my old 93 escort, put a screwdriver into the wire and grounded it out on the valve cover, asked my mom to roll the car over


I threw that screwdriver 20 feet up into the air