decided to change spark plugs and dig up a little bit.
this is the typical coilpack for the GDI engines,
i had a bad one where the stem got a crack and the spark was hitting the walls in the engines and not going down through the spring and hitting the coilpacks. i was able to fix that and found out its not really the coilpacks that blows its the the stem that can be replaced or epoxy . THANKS to a fellow 93tgdi tuner.
ok there is only one part u can open on the coilpack is to the top when i pulled that out i saw white corrosion on the spring on the stem {normal electrical wear i hoped} .
i took 95% alcohol , didnt have CARB spray and a small blade and took it off. on the coilpack they is a phillip screw inside the pack where the stem attaches it cant be unscrewed so dont even bother before u spoil it. had a lil bit of corrosion on it so i used the blade and got it off.
ok the stem part where the sparkplug goes, i used a cue tip only thing i had and alcohol and cleaned the spring inside and as the pict shows
after compressed air was used to blow out any remainin alco .
stems were all check for breakage and snapped back together.
the grounding wires that attaches to the coilpack were black so a piece or sandpaper was used before and after in pic. sanded the coilpacks metal transformer thing had a bit of rust it them also.
old plugs was replaced with new ones and everything was carefully tighten back up .
i used to get a bit of bad idling before engine used to idle ruff . at cold starts engine use to stall a little bit .
NOW , idling smoother.
hope its helpful to anyone with a GDI ENGINE. its bout caring right.