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Diagoins Of A Fauly Coil Pack

Guest trikdoutbuketofshit

By Guest trikdoutbuketofshit,
in Western Australia

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Guest trikdoutvl

Guest trikdoutvl

Posted
Posted

Ok so motorvation is 2 days away and my car decides to sound like a wrx again. exact same thing that happened last year. It was a coil pack. So my question is how do you diagions a fkd a coil pack???? The best way I can describe it is the motor sounds like a wrx and it has fk all power.

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NISMOGTT Collaborator

NISMOGTT

Posted
Posted

Ok so motorvation is 2 days away and my car decides to sound like a wrx again. exact same thing that happened last year. It was a coil pack. So my question is how do you diagions a fkd a coil pack???? The best way I can describe it is the motor sounds like a wrx and it has fk all power.

sounds like a wrx and no power... you sure you did not get in a wrx :P

you can visually inspect by running your finger nail around it and see if there is any hair line fracture...

you can do the old turn the car over with the coil pack out and see if any spark excapes...

also think you can check the resistance and make sure all are even...

only other way is to start the car with one off at a time and see which one made no difference (ie you will be running on 5 cylinders with one buggered and as you remove working ones you should go to 4 running cylinders)..

autoworx Rising Star

autoworx

Posted
Posted

resistance and visual damage does not always mean much , i have seen many that look in perfect condition , measure fine and still die under load

also they often spark at idle but break down under full load

best way to tell is to get a good coil and swap them out one by one and test under load

did you replace all the coil packs with something decent like splitfires last time or did you just replace the 1 with a stock one ?

if so get some splitfires and never worry about it again

snozzle Mentor

snozzle

Posted
Posted

if the problem is present on idle just unplug the coilpacks 1 by 1, whichever is the one that doesnt make a difference to how it runs is obviously the dud one.

swap that over to another cylinder and see if the problem has carried over to that cylinder. if it does then that means the coilpack is screwed.

if the problem is still in that cylinder, that means your problem is elsewhere

  • Like 1
lunjiaow Community Regular

lunjiaow

Posted
Posted

Should be careful when checking coilpacks. the way Snozzle mentioned, may blow the coilpack driver (the box that sits at the end of the head).

If you can get to the injectors, diconnect them one at a time to see which cylinder it is. Much safer option unless you know how to check the coilpacks properly.

I would recommend splitfires, never failed on me once with 1.1 gapping and lots of boost.

Wogan Proficient

Wogan

Posted
Posted

also don't jump to the coilpacks answer whenever you have a missfiring problem... there are many other possible causes as anything to do with fuel / timing / spark can cause symptoms similar to coilpacks..

personally i've had 3 different occasions when my car was missing... each time the problem was not the coilpacks, despite everyone on the forums suggesting they were.

(mine turned out to be the CAS, then the AFM and then a sticky valve... each were 6 months to a year apart)

Pr0j3kt_Supra Contributor

Pr0j3kt_Supra

Posted
Posted

also u didnt happen to wash ur engine bay recently? water in the spark plug wells.... coincidently it took 2 days after i washed my engine before misfiring occured and only to find out it was water after a new set of coils had arrive ...Doh!

  • 7 months later...
  • 7 years later...
FedBpy2018 Contributor

FedBpy2018

Posted
Posted

I started my car last night to visually check my coil packs due to a surging issue, im glade i did, even at idle i could see the spark jumping out onto the motor, so she is gunna sit until I get my new ones, my general rule of thumb is if 1 is on the way out replace the lot, for example if a shockie needs replacement i do all 4 at once

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