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View Full Version : Car running on 1 2 cyl only 3/4 has no fuel but spark


importdude
11-22-2007, 02:21 AM
So the car runs on 1 and 2 only

3 4 has no fuel(changed out with good working ones,), but has spark
i tryed unhooking the injector clips on 3 4 after car is started and it doesnt make a difference

I previously thought that the ecu injector drivers were burnt, but i tryed a used ecu that was working fine...

same problem
Bad maf?


i also tryed to Start the car with no MAF connected
it just does the same, stumbles and dies
(shoudlnt it rev up to 2500 for limp mode?)

THANKS
been trying to fix it for 2 weeks and car has been down for a month:(
getting ready to partout

projekt_s13
11-22-2007, 04:24 AM
Try plugging injector 1&2 clips to 3&4, see if they feed fuel.

oh and nice meeting you tonight.

downshift_sideways
11-22-2007, 04:40 AM
Nice meeting ya,

I got those parts ;)

Lemme know .

IRN
11-22-2007, 05:33 AM
check for injector pulse. each injector plug has 2 wires. red is the constant positive. the other wire is the pulsed negative.

forgot all about the ka if thats the case but heres help if its a sr.

http://img249.imageshack.us/img249/7881/s13nm9.th.jpg (http://img249.imageshack.us/my.php?image=s13nm9.jpg)

pin 101 injector no.1 drive output - white black
pin 110 injector no.2 drive output - yellow black
pin 103 injector no.3 drive output - green black
pin 112 injector no.4 drive output - blue black

run a test light to a positive source either to the injectors positive or battery + and then to the each injector pulsed negative and if its working properly it should blink the bulb (very dim) be careful not to short anything.

check all the grounds for the injectors located on the 4th runner of the intake manifold i believe. also check the ground for the coil pack on the back of the head as well as all grounds. ka and sr runs like hell without a good ground.

if you get no pulse, check for connectivity for each injector pulse wire. on the ecu pin plug (big blue) find the wire color for the injector - pulse. for no.3 its the green black and for no.4 its blue black. get a voltmeter or those connectivity test lights and see if you get a good connection from end to end. ecu plug to the injector plug. if you dont then you might have a short in the engine harness. check the ecu plug for any loose pins. swap over the ecu and see if it makes a difference in the connectivity and pulse tests.


same concept for KA just might be different colors.

projekt_s13
11-22-2007, 05:42 AM
Nice first post dude, very informative.

IRN
11-22-2007, 05:44 AM
Thanks, my old single cam KA did the same

downshift_sideways
11-22-2007, 05:52 AM
Theres a bit more that wasn't explained.

He had an n60 MAfs when he had a turbo setup on that same engine.

He had the motor rebuilt,and wanted to break it in N/A. He installed the s14 OEM MAF (cut + crimped)
using a SOHC clip(just clip part)To the DOHC Mafs sensor. Soonly after that, He drove the car, and fried his ECU.

I'm guessing its wiring that went bad.

what would you suggest?

IRN
11-22-2007, 06:03 AM
just go over the wiring. too many possibilities.

short
bad connection
wrong connection
melted wires
etc.

if he fried the ecu then it could easily cause this problem but he said he swapped over the ecu and still not fuel. could of fried that other ecu or ecu is fine and its just his harness that isnt getting a good connectivity. run through all your connections before another ecu gets fried. GL

importdude
11-22-2007, 01:44 PM
thx for the replies, ill get on it first thing tomaro

I sorta did a test before from Injector clips
1 2 4 has no voltage when testing from the injector clip pin 1 , 2
3 has voltage from pin 1 , 2

did a litle test before i leave
moved injector clips from 1 2 to 3 4
car wont start

beefed up the ground with 8guage wireing

still neg

importdude
11-23-2007, 07:56 PM
all injector clips get pulse(moving volts right, very low tho,)
all Injector ground wire gets connectivity to ECU harness


Compression

150 150 150 135

car has s13 HOTcams
intake is 4chainlinks to the left

.............so im doubting its the engine harness right now,

importdude
11-25-2007, 06:41 PM
UPDATE!,
IT WAS THE MAF CONNECTOR THAT WAS BURNED/FUCKEd up
i cut it off and the car idles with all 4 cylnder

then the car will rev to 2500 and cut off(limp mode)

i put in a diff maf===
drives awesome now,

i wanna give a big thanks to downshift_sideways (http://www.zilvia.net/f/member.php?u=43380)
letting me barrow maf/wiring harness