It was an “exploded” coil. I was barely running on 3 cylinders.
Easy repair. When you have these symptoms:
it’s coming up with the traction control light and check engine light that periodically flashes. OnStar shows codes C0561 and P0300. It’s running very rough and has barely any acceleration at low RPMs. The car shakes and shimmy’s like I’m driving over potholes when I try to accelerate. I was barely running on 3 cylinders.
check first the
25198623 Ignition Coil and second check the spark plugs
55585517 Spark Plug, in DIY terms it's about 100 US $ for the coil, and 10$(max) for every spark plug(you may not need them).
https://www.gmpartsonline.net/auto-...as-engine/electrical-cat/ignition-system-scat
How to(replace ignition coil or/and spark plugs):
Replacement, ignition coil only, similar to Astra H, watch from 0:55 time:
Usually the ignition coil gives you headaches because of the high humidity, condensate or because of the spark plugs, that had to be changed at 35k miles and it was not done. Change the spaks every 20-25k miles(in severe conditions) or the ignition coil will die. Change the spark plugs every 35-40k miles of highway driving or the ignition coil will die.
The original ignition coil is Delphi, there are replacements from ACDelco, Hitachi and others. It is said that the original one is not the best and there are better aftrmarket options.
Delphi, for 1.8 liter engine,
for 1.4 turbo the part number is DELPHI GN10401-12B1:
https://www.drive2.ru/l/462059317286143553/
The new coil for
1.4 turbo looks like that:
https://www.drive2.ru/l/477644894609866756/
Here you can see the damage on the coil(unidentified cause, maybe sparks, maybe water), 1.8L:
https://a.d-cd.net/6083836s-960.jpg
Here you can see the damage on the coil(unidentified cause, maybe sparks, maybe water),
1.4L turbo:
https://a.d-cd.net/6cd7b69s-1920.jpg
Sparks should be like these, AC Delco 19347370(or other brand, but similar design),
1.4 turbo:
https://www.drive2.ru/l/479302133510832491/
Ignition coil repair kit(includes the spring contacts), does not help much when the ignition coil is dead, but some people try it when the spring contacts are "expired",
1.4 Turbo:
https://www.drive2.ru/l/7177853/