GSX Has no spark on middle 2 cylinders!

[ChrisNelson]

My '95 GSX won't start. The plugs on the outside 2 cylinders are fouled from cranking so much, and the middle 2 plugs have had no spark and are not fouled. I did a spark test and the 2 plugs that are fouled have spark, and the 2 that are not fouled do not have spark.

the first thing that I thought of was "well, I need a new coil pack..." but before I go and buy a brand new coil pack, I wanted to check here to see if anything else would've been an obvious solution...

What determines when the coil fires? Is it relational to a specific sensor? My Cam Angle Sensor is brand new... but what else could I check?

Thanks

 

[FastGS-T]

Swap the two outside spark plug wires with the 2 inside ones, and see if they problem switches. If it does then you have bad wires. Or swap the 2 inner plugs out with the 2 outer ones and see if it changes. Thats the cheapest route.

 

[sonicnofadz]

To test spark, this is what I do:

1.) On the gas tank, unplug the fuel pump.

2.) Start the car, and let it die from lack of fuel.

3.) Remove all four spark plugs. Plug them into the wires, and have someone crank the motor over and visibly observe the spark coming from all four plugs (if you have a garage turn out the lights, if not then do this procedure at night). Be careful not to shock the bejesus out of yourself.

 

[ericbev]

http://www.dsmtuners.com/forums/showthread.php?t=210886&highlight=testing+the+coil
http://www.dsmtuners.com/forums/showthread.php?t=197734&highlight=testing+the+coil
http://www.dsmtuners.com/forums/showthread.php?t=72970&highlight=testing+the+coil
http://www.dsmtuners.com/forums/showthread.php?t=42285&highlight=testing+the+coil

 

[ChrisNelson]

Well, I've already swapped plugs around, and swapped wires around, and it's always the middle 2 cylinders are dead.

I'm going to go out and find the transistor pack, and try and do some testing. Thanks for the help and I'll keep you posted!

 

[92awddsm]

Before yo do that, switch your coil packs around. On the 4g63, cylinders 1 and 4 share one coil pack. Cylinders 2 and 3 share the other coil pack. If you lose spark on just 2 and 3, chances are the coil pack is bad.

 

[ChrisNelson]

Well, I guess I'm a little confused ... I thought that the 2g turbos had only one coil pack? It is all one unit isn't it? How do you swap around the coil packs then?

I put a test light on the coil pack connector like the manual said and there is no power on pin 1 according to this image:

http://dsmtuners.com/forums/attachment.php?attachmentid=33471&d=1088544507

I think that is a pretty good indication of what may be the problem, but I have no idea what that means! haha!

 

[Ultimatedsm]

Well you can consider it as one unit, but when you look at it closer, there are two sets of coils. You are saying the middle two are not firing, it sounds like a coil-pack issue. I would get a used one and see what happens. Doesn't the power transistor effect 1 and 4?

 

[ChrisNelson]

Well I pulled off the transistor pack today and here's the readings:

Testing with a D-Cell battery and my DVM.

I tested continuity between pins 3 & 8 for cylinders 1 and 4 and energized pin 7 as the gateway and my meter read 0 volts at rest and .589 volts once energized.

I tested continuity between pins 1 & 3 for cylinders 2 and 3 and energized pin 2 as the gateway and my meter read 0 volts at rest and .589 volts once energized.

I'm going to do a little more testing, but hopefully someone knows if this proves anything...

 

[ChrisNelson]

I found something else that is probably a problem... I found a little gray (what I think to be a) capacitor mounted to the driver's side of the intake manifold right next to the coil pack.

The wire shielding is broken and the wire is pretty corroded. I'm going to replace it, but I don't know what it is. It has a little mitsu logo on it and it says "0.5uF" and some other letters & numbers that are mostly faded off of it.

It is a single wire connector and it has a little "U" bracket right on it to mount it to the chassis.

 

[ChrisNelson]

Well, I tested the capacitance on that little gray cap that I found, and it holds .5 uf, but it is a loose connection right before the cap where the wire is broken and it will be replaced.

Any suggestions on why I don't have spark if my transistor pack is good, and the coil is good?

 

[92awddsm]

Well, I guess I'm a little confused ... I thought that the 2g turbos had only one coil pack? It is all one unit isn't it? How do you swap around the coil packs then?

I put a test light on the coil pack connector like the manual said and there is no power on pin 1 according to this image:

http://dsmtuners.com/forums/attachment.php?attachmentid=33471&d=1088544507

I think that is a pretty good indication of what may be the problem, but I have no idea what that means! haha!

It is 2 seperate coil packs mounted on 1 bracket. One pack fires #1&4 cylinders. The other fires #2&3 cylinders. Like I said, if you have fire on only 1&4, thry swapping the coils to see if it changes. If so, its a coil problem.

The "capacitor" you are talking about is actually a condensor. It will not affect how the cars runs. It is there more as a noise filter than anything.

 

[ChrisNelson]

Thank you sir. I will try swapping coils tonight and see what happens.

 

[ChrisNelson]

cyls 4 & 1 primary resistance: 1.1 ohms
cyls 4 & 1 secondary resistance: 12,600 ohms

cyls 2 & 3 primary resistance: 1.1 ohms
cyls 2 & 3 secondary resistance: 12,540

The numbers for the primary resistance looks high to me, but they are identical, and I know that cyls 4&1 coil is working, so I must assume that the others are good. Before I totally rule out the coil pack, I'll swap it with a known good one, but I'm moving on for now.


gonna bring in my ecu tomorrow and get it checked.

 

[ChrisNelson]

Well I brought the computer in today to get checked out, and everything on it looked to be in great condition. Is there anywhere that you can send in a computer from an eclipse to have it actually tested?

 

[tranceman]

This guy can repair boards, so I would imagine he could test them as well. I realize that the link is for 1G applications, but its worth asking him at least.



http://simon.chi.il.us/~steve/Auto/DSM/ECURepair.html

 

[sheldonh26]

hey im hoping to get some helpful advice here im just new to this. here it is- i just bought my dsm and wen i purchased the car it had a slight missfire so i checked the plugs and sure enough they were gone so i replaced with new br7es ngk. the car was fine and pulling hard but in the top of third i felt a slight missfire at wide open. two days later i cracked it then in third at 3000 rpm i felt it sputter so i slacked off right away and eased into it to see if it was still missing and it was an intermediate miss for a few sec then rpm just died down so i turned around to head home and it took a bit to keep it going in first then it cleared up and sputterd again so i limped the car home and while slowing down i down shifted to secound and the rpm seemed smooth shifting down till i hit the throttle again. when i got home i hooked up my obd and it had two random misfires. checked the ignition and it was the two middle cylinders not getting spark the coil seems gone to me but im curious! i started it up again and only firing on 1 and 4. hopefully someone can help. seems like my coil got fried from not keeping up with my new plugs? i figure this because the spark was coming and going on my limp home. thanks guys and hope to hear your opinion s.

 

[ed1380]

hey im hoping to get some helpful advice here im just new to this. here it is- i just bought my dsm and wen i purchased the car it had a slight missfire so i checked the plugs and sure enough they were gone so i replaced with new br7es ngk. the car was fine and pulling hard but in the top of third i felt a slight missfire at wide open. two days later i cracked it then in third at 3000 rpm i felt it sputter so i slacked off right away and eased into it to see if it was still missing and it was an intermediate miss for a few sec then rpm just died down so i turned around to head home and it took a bit to keep it going in first then it cleared up and sputterd again so i limped the car home and while slowing down i down shifted to secound and the rpm seemed smooth shifting down till i hit the throttle again. when i got home i hooked up my obd and it had two random misfires. checked the ignition and it was the two middle cylinders not getting spark the coil seems gone to me but im curious! i started it up again and only firing on 1 and 4. hopefully someone can help. seems like my coil got fried from not keeping up with my new plugs? i figure this because the spark was coming and going on my limp home. thanks guys and hope to hear your opinion s.

#1-HOLY revival batman
#2-HOLY run on sentence
#3-Please just start a new thread in the newbie section and post more details about the vehicle, and make it so that we can understand.

 

[TSi Kid]

I'm throwing money on it being a coil pack.

 

[sheldonh26]

i just put a new coil pack on it and it is still getting zero spark on 2&3. fackk