misfire/bad coil? idk help!

[eclipsechris]

yoo!
ughh.. yet again!!
okay.. my problem is:

96' mits. gs-t

im getting code po300 (random misfire)
and my car sounds like a suby. but its SLUGGISH.
and u can push the gas pedal and the rpms just BARELY raise.
my wideband (mtx-l) reads LEAN!! (22.4) this is idle.
but once u rev it, the misfire goes away, but of course the rpms still raise sluggish.

i pulled all the plug wires starting from the left side,
and when i got to the two middle ones, you can hear they are not firing.
i traced them back to the right side of the coil pack.

also, when i come to a stop, and i clutch in, my rpms drop to like 450-600 and sometimes my car stalls.

now idk if thats bad ignition coil or what?
im SOOOOOOO frustrated.
i wanna fix and sell and just be done!


but anyways, any help would be GREATLY appreciated.
thanks so much!


also i have new : wires, plugs - bpr6es . 28 gap.

 

[miguelmcv]

Check if you have power on the coil (2 and 3), if you have power then you have a bad spark cable, If you don't have power on the coil, then I might say your transistor is bad.

 

[eclipsechris]

hey bro, thanks for the quick response, and not being a douche!
and spark cable???
whats that?

the the power transistor is one of the two pieces that makes up the coil right??

 

[miguelmcv]

The spark cable/wire ( the wire that runs from the coil to the spark plug).


The transistor is the square module bolted on one side of the coils, It is bolt it right on the middle of the intake manifold, right behind the fuel rail, It has a long connector.

Edit

I found this one for reference (post #8) http://www.dsmtuners.com/forums/mai...si-awd-no-spark-cyl-1-4-tried-everything.html

 

[eclipsechris]

oh. , duh! i got you, thanks!
they're brand new, but of course, new products dont mean anything. ill check them.

and thanks man!!

this car frustrates me so bad!

i <3 eclipses, but its time for me too sell.

also, during the idle when its missing or whatever, the rpm cluster stays practically at 0, but my shift light reads properly. if that means anything

also, during the idle when its missing or whatever, the rpm cluster stays practically at 0, but my shift light reads properly. if that means anything

----EDIT AGAIN----

that could also cause my super freaking lean condition?

i would think it'd cause a rich condition right?

idk

 

[turboglenn]

when you isfire you dont burn the fuel or air properly there-fore, the amount fo unburnt oxygen in the exhaust is higher than when firing properly and giving a lean reading

 

[DSM IN MN]

Get new spark plugs, gap them correctly, THEN get a set of NGK spark plug wires. I threw the exact code late this past summer. I put new plugs in then a new (expensive) coil. I skipped the plug wires like an idiot.

 

[Lou98GSX]

if your wide band shows lean and your misfire goes away when you raise the gas then it sounds like you have a vacuum leak .

 

[My1GLaser]

I was gonna say that it sounds like the coil, since 2&3 fire off the same one. Do you have anyone close by with a DSM that you can swap a known working coil in? If your tach is reading wrong also, then maybe you have a bad crank signal? I don't know a lot about the 2g ignition where it differs from a 1g...

I was having horrible spark blowout at high rpm/boost and it ended up being my plug wires. They were NGK wires with only 15k miles, which is 4 years on my weekend car...

 

[eclipsechris]

man.. the plug wires / plugs are like 2 weeks old maybe if that. =\
they're gapped correctly, and the bpr6es.

and a fellow dsm'er leant me a coil pack, ill plug in the connector tommorow and see if that helps.

ughhh, i hope its not the crank sensor...

i've read up alot, usually its bad news with the crank when that thing goes. =\

hopefully its just the coil.

thanks too you all, and ill try to keep and update tommorow.

 

[My1GLaser]

Make sure the coil pack is grounded if u don't by it in place of the other one. I had to run a separate chassis ground wire to mine with the relocation bracket I am using. I could be wrong, but I think it grounds thru the coil body bolts to the IM in the stock location.

 

[evileclipse909]

deffinetly the transistor module.

 

[turboglenn]

'm agreeing transistor , It can't be the crank sensor as it can['t skipcertain cylinders unless you've got ome major issues that would hav eto be done on purpose..usually when it fails you loose al cylinders, if it were the cam sensor it wouldn't stay running becayse the ECU woldn't know that cylinder one was coming up and would only fire each cylinder one time every start

check volts to the coils and grounds...check volts and Ohms to transistor and coils.. When i've had issues of dropping half the cylinders it;s usually been a wire to one of the coils or a wire to one side of the transistor (or problems with an MSD box)

 

[eclipsechris]

so yeah i swapped the coil,
definatly not the coil.
i swapped some wires around, and they were good.

so now check the igniton control module??

i didnt even think about that, i've had one go bad on me before.
it would start fine when it was cold, but once it warmed up, it didnt wanna start at all.
but okay, thanks ill try that also!

and leave feedback!!

 

[eclipsechris]

figured it out guys,
thanks for all the help
it was indeed the power transistor unit,
aka ignition control module.

thanks for all the help!!

 

[miguelmcv]

Don't forget to mark the thread as resolved so people out there can find easier they problem.