jeremyuhh

my #1 cylinder stopped firing out of now where.

i pulled each spark plug cap, and when i pulled #1 there was no change, and when i pulled #2, #3, and #4, the car started to die.

i pulled out the spark plugs, and plug #1 looked okay, everything intact, but the tip was slightly burnt, compared to the others, which were clean and had no residue.

so i checked to see if #1 spark plug wire was sparking, i grounded it, and spark came out.

did a ohm check on all my injectors, and this is what i read:
#1: 0 / #2: 11 / #3: 49 / #4: 11

i also noticed that injectors #2 and #4 has a blue dot. im guessing they were rebuilt or replaced.

my questions are:

1) should i replace the #1 injector only or replace all four?
2) would it be easier to get all flow checked and cleaned?
3) and is it common for just one injector to go bad?
4) could it also be bad wiring?

any help is appreciated.

Edwin562

stock resistance should be around 11-14 ohms.

KrazyS13

Your number one injector is dead obviously, and #3 is out of spec and is either out or about to be. You can replace one at a time if you'd like but if you plan on keeping the car/engine than doing all 4 is good insurance. The others will fail eventually if not replaced.

The red injectors that come in KA's(DE) are known to be problematic. I ultimately went through 3 on my KA, all being replaced at different times, 2 of which I replaced with remans from advance auto and the other being a good used injector. Hope this helps.

jeremyuhh

good to know, and thanks for your help.

should i go for brand new injectors, used ones at a junk yard, or get mine fixed?

brand new ones at are like $79.99 at pep boys or autozone, seems a little pricey.

KrazyS13

No problem

I would get rebuilt ones from ebay if I had to do it all over again. There is a seller on there that has remans for 32.95 shipped..

jeremyuhh

ok cool thanks again. ill keep that in mind. i might just pick some up from someone locally, i need my car running by tomorrow. haha

jeremyuhh

Ok so I replaced injector #1 And #3 and now have all injectors at 11 ohms. Started the car, worked fine. All cylinders firing

I then drive about 30 miles. Left the car for about 2 hours. Went to start it. And it took a while to turn over. After about 20 seconds car started and cylinder #1 stopped working. I pulled spark plug cap #1, no change in engine. Grounded it and it showed sparks.

Basically the injector died again. Haven't had a chance to test the ohms yet. But I'm guessing it's an electrical problem now ? Something to do with wiring or voltage to the first injector?

Walperstyle

have you tried swapping injectors around to make sure it wasn't a problem with the harness? ... I do see the prevous trouble shooting you did, but I'm just asking.

Usually anything Injector related, I swap them around and see if the problem follows. If yes, Injector, if no, harness/ecu/fuel rail/whatever else.

__________________
KA-T ORG-Function over Flush

jeremyuhh

i tested all 4 injectors, all read 14 ohms.
i tested all 4 female plugs off the wire harness on the fuel rail, all ready 11.88~ volts.
pulled out spark plug cap 1, no change in engine. pulled out 2,3, and 4, engine began to die
i took #2 female harness plug and connected it to injector #1, still no combustion
i took #1 female harness plug and connected it to injector #2, worked fine.

so im thinking, its either the ECU or spark plug. havent checked the spark plug yet cause i dont have a spark plug socket with me.

my friend also suggested it might be the fuel regulator or filter? could that be it? but i dont see why it would only affect one cylinder.

Walperstyle

ok don't swap pigtails with the injectors, physically swap them. your ECU reads your timing from a CAS and tells what injector when to fire. ...either way, I doubt that is the problem, but you should have done what I said first before buying a bunch of different stuff.

When you say
i took #2 female harness plug and connected it to injector #1, still no combustion
i took #1 female harness plug and connected it to injector #2, worked fine.

what do you mean 'worked fine'. You could tell the injector was firing on time with when no1 should be firing?

I also don't understand what you mean by pulling spark plug 1 with no change... Did you then plug it back in before pulling no2, or just start ripping them out and leaving them.

I'm sorry if I'm assuming you are an idiot, I just need to know what you are doing. lol


Anyways, if the engine is running rough when you pull a spark plug lead, then that is good, it means you lost power to a cylinder. If you plug it back in, and pull a different lead and nothing changes... then that means you have been running dead on one cylinder for a while.

how hot is your exhaust? like hot enough where there is a bunch of un-burnt fuel igniting in it?

do you have a factory service manual? www.240SXTECHDVDS.org Home Page

also, if your car is a s13, you have an external coil Distributor. This could also be the problem. It gets hot, and malfunctions. If you have a friend with the same engine, try swapping for a day.

__________________
KA-T ORG-Function over Flush

jeremyuhh

since cylinder #1 is dead i took the pigtail for #2 and plugged it into injector #1, and the cylinder still didnt fire.

i then took the pigtail for #1 and plugged it into injector #2, and it was firing.

lol, i pulled the spark plug wire, while the car was running. so all spark plug wires were in. i pulled each one, one at a time. i pulled wire 1 only, the engine remained shaking like crazy since cylinder 1 is dead. i re-inserted it, and pulled wire 2, engine began to die. i re-inserted it, pulled wire 3, engine began to die. re-inserted it, pulled wire 4, engine began to die.

i havent checked how hot my exhaust was getting, but i could smell gas coming from back there.

so even if my injectors are reading 14 ohms for all 4, i should still swap out injectors to cylinder 1?
and yes i have a 93 s13, but i grounded each spark plug wire and i was getting constant spark from each of them

thanks again for your help man. appreciate it.

Walperstyle

so basically,
-if the problem moves with the injector: crappy injector
-if problem stays on no1, then I'd bet its probably the wires going to that injector, coming from the ECU. Pehaps the ECU itself had a small spider or something lay eggs on a capacitor inside or something. Fried circuit for no1....I dunno.

meow

__________________
KA-T ORG-Function over Flush

jeremyuhh

lol anyway..

i got some injectors from the junk yard. swapped them with my #1 injector, car runs fine now.

but this is exactly what i did when the problem first started. i bought some injectors off someone on zilvia, switched it car worked fine. after 30 miles or so, cylinder #1 was dead.

if it happens again, what should i target next? the ECU ?

Walperstyle

yeah if you can do a simple swap with another ECU at little or no money spent, then go for it. Its always better to move around and play with the cheap or free stuff before messing with other stuff. If that doesn't work, then its probably bad wires or something acting up when it gets hot.

__________________
KA-T ORG-Function over Flush

jeremyuhh

drove the car for like 5 miles, turned it on and off 3 times. 4th time i started it it took a while to turn on then cylinder #1 went dead again. so fucking lame

this is what the injector looks like after i pulled it out.


if i swap ECUs do i have to have one from the same year? or just as long as its for a ka24de, auto or manual, since my car can use both

Walperstyle

Auto or Manual ECU will work. PS, that o-ring needs to be replaced.

__________________
KA-T ORG-Function over Flush

jeremyuhh

look right above the o-ring, the plastic looks like it melted. any idea how ?

matts13vert

Check your compression on number 1

__________________
VISIT OUR NEW SITE!
streetfaction.net

jeremyuhh

just did it and got 140 psi on all cylinders.

Walperstyle

I can't really see what you mean or how it applies.

__________________
KA-T ORG-Function over Flush