As the topic says i'm experiencing a constant failure of coil pack #4, to rectify the problem i've done the following.
Changed the Spark Plugs Replaced all coil packs with new originals from firm (after 2nd failure of #4) thereafter #4 has failed twice making it a total of 4 times in the space of 6 weeks, after the first 2 failures of #4 i replaced with foreign used since i want to be certain the issue causing the problem has been rectified.
for further information the car has never overheated, a mechanic advised me to change the ecu, from reading i'm also thinking that the ignition control module may be bad that would be causing the failure (i'm uncertain tho if this would cause failures in the other ignition coils as well, which i've not experienced)
i do experience also a rough idle sometimes which is intermittent and have noticed that the failure occurs mostly under heavy strain, ie. a drive up to maracas or any hill climbing etc.
i'm at a loss to figure out what next steps to try, any help or suggestions would be greatly appreciated.
Yes got denso plugs from massy, there's no oil on the plugs however i've noticed the top of the plug on the #4 looking "scorched" also the body of the plug the metalic part above the tip also had a much darker almost burnt color, the tip of the plug was also looking much older than the others in so much so that it looked like i hadn't changed the plugs in about a year, although it was 3 months ago that they were changed when i was trying to diagnose the problem which was one of the first thing that i did since i thought a bad plug was causing the issue.
Great to hear this was sorted out. Can you or anyone tell me where is the Ignition Control Module? Can you send a picture? Where can I get one? I am experiencing your exact symptoms, instead of ignition coil #4, my #3 is the issue.
sometimes theres a clip that holds the harness near to the dipstick, sometimes it does accidently bend and cause problems i saw issues where this burnt two coils till a day i saw it and since then it was fine since. peep and see.
also i do believe the ecu needs to change, the injector driver and coil driver is built into the ecu. replace ecu, recode back key and ya bad.