Cylinder misfires, code p0301

2011 CHEVROLET AVEO
112,000 MILES • 4 CYL • 2WD • AUTOMATIC
Avatar
LAPARSONS
  • MEMBER
  • 3 POSTS
Car started missing, code was p0302. I replaced plugs and coil. Coil covers all 4 plugs. Problem went away for a day. Now missing again but has p0301. So the cylinder 2 misfire was fixed but now a cylinder 1 misfire is present.
Sep 21, 2020 at 11:51 AM
Advertisement
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
Good afternoon,

Did you replace all the plugs and coils?

Was there any oil in the well for the spark plugs?

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Roy

Image (Click to enlarge)
Attached Media
Sep 21, 2020 at 1:55 PM
Avatar
LAPARSONS
  • MEMBER
  • 3 POSTS
I did replace all plugs and there is only 1 coil that covers all 4 plugs and I did replace that as well. There was oil in 2 of the wells but oddly enough the oil was in plugs 3 and 4 which don't show a problem.
Sep 24, 2020 at 5:33 AM
Advertisement
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
Okayt, then the next thing I would check is fuel pressure. Misfires are common from low fuel pressure.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Fuel Pressure

Ignition "on" engine "off" .................... 365-414 kPa (53-60 psi)

Relieve the fuel pressure to 69 kPa (10 psi). Verify the fuel pressure does not decrease greater than 14 kPa (2 psi) in 5 minutes.

Roy
Sep 25, 2020 at 3:01 AM