Follow up after 6 months. Check engine light came on again, rough idle, pulled the code (P0303
) and it was cylinder 3 this time (the last number is the number of the bad cylinder
), cylinder 2 last time. Got a new coil ($80 at Advance Auto, Borg Warner part), installed, problem corrected. Son said, well you just as soon internet order 2 more as they will likely go out (85,000 miles on it, but it idles a lot, more like 110,000 on the engine). I got 2 Delphi coils (made in China) for $31 each, arrived in 5 days via USPS. Popped them in, easy deal. I had to use pliers on the tab to pull the little wiring connection off the back of the coil, but no biggie, just go easy.
The idle is very smooth, as is acceleration.
I had this other weird issue on starting, it sounded like a whirring or fluttering sound in the motor. After I replaced the last 2 coils and all are new, the fluttering sound on starting went away. I'm guessing this was some sort of timing issue with a cylinder not firing correctly. Posted just in case anyone else encounters this.
HONDA - Cylinder 3 Misfire Detected
Faulty spark plug 3
Clogged or faulty fuel injector 3
Faulty ignition coil 3
Fuel injector 3
harness is open or shorted
Fuel injector 3
circuit poor electrical connection
Ignition coil 3 harness is open or shorted
Ignition coil 3 circuit poor electrical connection
Insufficient cylinder 3 compression
Incorrect fuel pressure
Intake air leak
Read more: https://www.autocodes.com/p0303_honda.html
I also bought an inexpensive code reader ($20) and will look up the codes on the internet. Seems like a good idea with a 10 year old car. It can also reset the check engine light.