I put new plugs and the number six cylinder misfires. How to fix it?
Dec 7, 2018 at 6:40 AM
Misfire code 303
STEPHEN KUCHLER
- MEMBER
- 3 POSTS
Good evening,
303 is a misfire for number three cylinder.
https://www.2carpros.com/articles/engine-misfires-or-runs-rough
Some possibilities.
1. Plug
2. Wire
3. Injector malfunction
4. Vacuum leak
5. Low compression
6. Valve train damage
7. Failed PCM from not signalling injector to fire.
I would start by checking compression.
https://www.2carpros.com/articles/how-to-test-engine-compression
Roy
303
P0303
Descriptor
Probable Causes
Evaporative Emission (EVAP) System
Evaporative Emission (EVAP) System Canister Purge Valve
Fuel Injector 3
Fuel Pressure Incorrect
Ignition System
Mechanical Engine Failure
Vehicle Running Out of Fuel
303 is a misfire for number three cylinder.
https://www.2carpros.com/articles/engine-misfires-or-runs-rough
Some possibilities.
1. Plug
2. Wire
3. Injector malfunction
4. Vacuum leak
5. Low compression
6. Valve train damage
7. Failed PCM from not signalling injector to fire.
I would start by checking compression.
https://www.2carpros.com/articles/how-to-test-engine-compression
Roy
303
P0303
Descriptor
Probable Causes
Evaporative Emission (EVAP) System
Evaporative Emission (EVAP) System Canister Purge Valve
Fuel Injector 3
Fuel Pressure Incorrect
Ignition System
Mechanical Engine Failure
Vehicle Running Out of Fuel
Dec 7, 2018 at 7:13 AM