Cylinder misfires, code P0301

LAPARSONS

MEMBER
2011 CHEVROLET AVEO
4 CYL
2WD
AUTOMATIC
112,000 MILES

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.

Monday, September 21st, 2020 AT 11:51 AM

3 Replies

ASEMASTER6371

MECHANIC
52,797 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

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Monday, September 21st, 2020 AT 1:55 PM

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.

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Thursday, September 24th, 2020 AT 5:33 AM

ASEMASTER6371

MECHANIC
52,797 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

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Friday, September 25th, 2020 AT 3:01 AM