if possible, i would try switching back to your old spark plugs and seeing if the noise disappears.
Quote:
Originally Posted by L4ces
Car never had this problem and the car has been on 0w-40 for months. Now have exact problem reported by OP. These are the events that took place and led up to it.
1. oil changed same (0w-40). Did not notice an issue and nothing special about this oil change than any other).
2. changed sparks plugs and forgot to connect one coil before starting car.
3. started car and saw a weird engine light and reduced power mode, car shutoff.
4. checked the spark plugs and found that disconnected coil and connected the coil.
5. restarted the car and all was fine. No more reduced engine noise, no new weird sounds.
Restarted a few more times and easy driving all was well.
6. Next morning start car and witnessed the exact noise reported by the OP (exact noise)
Observed the problem occurs after the car has been sitting (4 is enough to cause it and maybe less).
I hope there was no internal damage but something is now screwed up.
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