one of those wtf problems...

alright here's the laydown, i'm going to start from the begining

i swapped heads on my KA24DE motor in my '92 [ish] 240sx

now for whatever reason cyl #2 refuses to fire

here's what i've tried

swapping plugs from cyl to cyl
swapping injectors from cyl to cyl
buying new [well used] injectors and swapping those in
testing wires for spark leak

now here's the thing

when using a NOID light i get a pulse on that cyl
when hooking up a spare injector to the dead cyl harness it clicks when the injector is supposed to fire
there is spark in the dead cyl... that's not the issue

when hooking up a DVOM to the injector harness on all the other cyl's besides the dead one there is 13.7 volts on one lead and 0 on the other... however on the dead one there is 13.7 volts on one lead and 12.4~12.2 volts on the other lead...

when holding a piece of paper over the cyl with the plug out there is no gas collected

what the bloody fuck is wrong with my car???

it was running fine until the swap

VERY weird. i'm assuming you cleaned/inspected all the connections. try swapping injectors again...... thats the only thing i can think of. unless you fried something in the harness or ecu.

do a compression test to see if all your cylinders have a sufficient pressure..

yeah just did that... found my problem

90-0-120-60

fixing it tonight after i eat

oooo... awful compression all around

drive it till it blows

tyler wrote:

drive it till it blows

he just put a race head on it....

i know

on a serious note............hopefully you'll be up and running by this weekend.

by any chance, did you deck the head before you install it back on the block?? also you should never use the old head bolts.. always use new ones..

profpin wrote:

by any chance, did you deck the head before you install it back on the block?? also you should never use the old head bolts.. always use new ones..

or arp.