Coilpack not firing

[QuickSpoolSR]

Trying to troubleshoot why my engine isnt running right/sounds like an sti. I found out it isnt sparking on the second cylinder back from the front which i beleive is cylinder #2. I checked the spark plug and coil on cylinder 1, and they both work. I am just wondering how to fix this issue. its clearly wiring but im not 100% how to test it.

[dgomez]

same happened to me. i also compared the sound to an sti. im pretty sure that its a fuel injector. that was my problem

[QuickSpoolSR]

No its definitly not sparking on that cylinder. And the spark plug and coilpack are tested and working

[Rabboni]

How did you find out it there isnt spark in cyl 2? Did you use an actual spark tester, or pull a plug, or do something cool that ive never even heard of before? If it isnt the coil or the plug,then youre gonna have to find an oscilloscope and test the signal to the coil.

[QuickSpoolSR]

i unplugged the coil and plugged it in the cyl 1 slot, if you put a spark plug in it and ground it and have someone turn it over you can see the spark. also if the car is running and i unplug coil 1 it almost dies, i unplug coil 2 no change, i unplug 3 it starts to die, and 4 it starts to die. I can leave coil 2 off and it runs the same, like shit

[dgomez]

i stand behind my idea.. fuel injector!

[QuickSpoolSR]

so the coil doesnt spark on that cylinder because of the fuel injector?

[codyace]

If you've swapped coil packs and the issue follows the same coilpack (as in, you moved the faulty pack to another cylinder and the misfire was now on the new cylinder) it would be safe to assume it's shot.

With that said however, you can source the OEM Factory Service Manual (FSM) and use it to find the 'test' to determine if the pack is truly dead.

Again, if you had a miss on cylinder 2, swapped coilpack and the misfire was now on cylinder 3, I'd put money on that pack simply being dead.


i stand behind my idea.. fuel injector!

You're a real space cadet

[QuickSpoolSR]

No it only missfires on 2 as I said before. I moved the pack from 2 to 1 and it worked on one

[dgomez]

Its The injector dude. Its not getting fuel

[steve shadows]

If it only does it on one cylinder and you're 100% sure that everything else is tits it could be the actual signal down from the ECU for that coil...or your coi pack harness...this is pretty 101 shit...

also check your coil pack harness grounds

[240zach]

fuck it, your motor got fucked in cyl. 2...im just kidding..
like dgomez was saying id test every little thing possible, even fuel. even if you dont think its the problem it couldnt help to check.

[steve shadows]

have you pulled the fuel rail off the IM and chcked to see if all injctors are spraying?

[codyace]

No it only missfires on 2 as I said before. I moved the pack from 2 to 1 and it worked on one

Ahhh I misunderstood you then. Dgomez, I apologize!

[ghost_22_47]

I would check the fuel injector to make sure you are getting fuel.

BUT if you want another ignition idea, I had an issue with my rb26 where there was an extra ground wire to cylinder 1 coil, but that was also blowing my coil everytime. But that caused it only to run on 5 cylinders and almost lit the coil on fire (smoked like crazy).

Good Luck

[theboy]

check your grounds, pull the harrness plug and check continuity to the ground wire in the harrness plug to the chassis.if thats fine unplug back probe the harrness plug on the positive side with a multimeter and ground the other lead of meter, see if you get any signal from the ecu. Dont crank it over cause you dont have a meter that can read the signal going through it. But check to see if you get power to the coil. If that still doesnt work, check continuity to the pins in main harrness plug at the ecu and the plug to the coil. If that checks out and is fine, then go buy a new coil and quit bitching about it sounding like an STI.


its pretty obvious that if you can unplug the coil while its running and it doesnt change a thing, then spark at that plug is the issue and you need to ignore everyone saying its an injector.

[klits562]

its pretty obvious that if you can unplug the coil while its running and it doesnt change a thing, then spark at that plug is the issue and you need to ignore everyone saying its an injector.

It could still be an injector, he moved the coil pack and plug into cyl 1 and it worked. Unplugging the coil when it was in cyl 2 and having nothing happened doesnt mean its the spark, it only indicates the cylinder is dead but not for what reason. You still need to check to make sure the injector is firing properly, THEN you should check your wiring and signals.

also have you done a compression test?

[Rabboni]

Look, unplugging the coil with no change on cylinder 2 doesnt mean the coil is bad. All you have proved by that test is that it is, in fact, cyl 2 that is misfiring. Furthermore,when you put the coil on cyl 1 and the miss didnt move to cyl 1 that proved that the coil is in propper working condition. Finally, you need to find out exactly WHY cyl 2 is misfiring, so I would do what the others are saying and check resistance on the injectors, then pull the fuel rail and see if all of them are firing, and have a good spray pattern. If, after all this, you are still convinced that it is a spark issue, get an oscilloscope and check the signal pulse coming to the coil harness from the ecu.

[ghost_22_47]

Actually, now that I think about it, what is easiest and faster would be to

1st: Check the Cylinder 2 Coil plug wires with a Multimeter, if the reading is bad then you know there is no spark.

2nd: Check the Cylinder 2 Injector connector with a Multimeter just to make sure that if your injector and fuel system is good then it should properly spray fuel.

3rd: Check all the wiring to the coil from the ecu for proper readings

I say do it this way because it takes 2 seconds to check the coil wiring and the injector wiring with a multimeter. But it takes forever to trace all those wires back through the car.

[Rabboni]

Actually, now that I think about it, what is easiest and faster would be to

1st: Check the Cylinder 2 Coil plug wires with a Multimeter, if the reading is bad then you know there is no spark.

2nd: Check the Cylinder 2 Injector connector with a Multimeter just to make sure that if your injector and fuel system is good then it should properly spray fuel.

3rd: Check all the wiring to the coil from the ecu for proper readings

I say do it this way because it takes 2 seconds to check the coil wiring and the injector wiring with a multimeter. But it takes forever to trace all those wires back through the car.

Are you saying to check the signal pulse with a multi meter, or just check the resistance? Checking the wiring, and the injectors resistance and comparing to spec would be a good thing to do. However, to check the signal pulse,you would need to have an oscilloscope.

[dgomez]

chuh chuh chuh change your injector. i am uh uh uh hundred percent right

[ghost_22_47]

Are you saying to check the signal pulse with a multi meter, or just check the resistance? Checking the wiring, and the injectors resistance and comparing to spec would be a good thing to do. However, to check the signal pulse,you would need to have an oscilloscope.

No, I was not talking about the pulse. I was talking about checking the resistance on a good one and checking the resistance on cylinder 2 (the bad one) and making sure the ohms are the same. That will weed out if the injector wiring is grounding out somewhere.

[holemilk00]

chuh chuh chuh change your injector. i am uh uh uh hundred percent right
So you're saying that a bad injector will cause the coil and plug to not spark?


He already said he pulled the plug and coil out and grounded it and there is no spark, not that it just was misfiring on #2.

To the OP: Its something in your coil harness, check your grounds, inspect the harness, look for wear or damage. Do like what was said above and check it with a multimeter. If that all checks out, then its something in the ECU that isn't sending signal. To check that use the same method with the harness plugged in to see if the ECU is sending the fire signal, don't quote me on this but it should be the red/yellow wire for #2.

[handinpants]

well i dunno, but i got some injectors and some coilpacks for sale, sent you a message

[Yami]

check ignitor and harness for ignitor had same problem before wif no spark on one cylinder

[Leroy_Stickshift]

my god this thread seems to be mis-informed, or incredibly disorganized.

im going through the same issue with my car on my #1 cylinder.

- swapped around coils to determine it is infact NOT the coil, even swapped the harness, checked all my grounds

i then pulled the plug to determine the state of my plug, it was soaked in gasoline, due to running with no spark, the cylinder was being soaked with fuel (eliminating my chance of injector failure.

i ALSO have a condition of blowing blue smoke out the exhaust, so i went along and did a compression test, after it all checked out ok (150psi across the board) i've decided to check my IGNITOR, as it has 4 or 5 leads, and amplify's the signal from the ecu to the coils, it would be a good place to search for a weak signal/no signal condition.


now, im not advocating that others are wrong for probing the ecu pins and harness, or using an oscillating scope do-dad (who the fuck has one of those kicking around amiright??)
but the EASIEST thing i can do is try and borrow a working part from another enthusiast.

i WILL post after i swap out to a known working ignitor and get back to you, if that doesnt work, then i will be going the next route and probing the ecu/checking for codes, so on and so forth.