p0303 help please
Thread Starter
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Junior Member
Joined: Feb 2011
Posts: 7
Likes: 0
From: Whitestown, IN
p0303 help please
Hello all and sorry for the long post,
awhile back my truck started bucking and hesitating under load with no SEL.
I changed my spark plugs and the truck ran fine for awhile with no issues.
Just today driving to work this morning the ole truck started missing out on the highway and as soon as i got to work the SEL lite up. Read the code and pulled a p0303 out of it for cyl. 3 misfire.
The plugs have less than 2000 miles on them (autolite platinum)
When I got home I pulled the wires off the coil pack with the
truck running. The only one that didnt have the spark jumping from the
coil pack to the wire was cyl. #3 ? Can anyone help me out here ?
Do i need to try replacing all the spark plugs wires, swamping out suspected wire with a different cylinder or when its dark tonight let the truck run with the hood open to see if i can see a light show from the plug wires ?
Thanks for the help in advance !
awhile back my truck started bucking and hesitating under load with no SEL.
I changed my spark plugs and the truck ran fine for awhile with no issues.
Just today driving to work this morning the ole truck started missing out on the highway and as soon as i got to work the SEL lite up. Read the code and pulled a p0303 out of it for cyl. 3 misfire.
The plugs have less than 2000 miles on them (autolite platinum)
When I got home I pulled the wires off the coil pack with the
truck running. The only one that didnt have the spark jumping from the
coil pack to the wire was cyl. #3 ? Can anyone help me out here ?
Do i need to try replacing all the spark plugs wires, swamping out suspected wire with a different cylinder or when its dark tonight let the truck run with the hood open to see if i can see a light show from the plug wires ?
Thanks for the help in advance !
Technical Article Contributor
Joined: Apr 2009
Posts: 10,697
Likes: 14
From: In the fast lane from LA to Tokyo...
Most likely the coil....or possibly the spark plug...
Here are some possible casues.
Possible Causes:
Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues
Faulty oxygen sensor(s)
Burned exhaust valve
Faulty catalytic converter
Poor compression
Defective computer
Here are some possible casues.
Possible Causes:
Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues
Faulty oxygen sensor(s)
Burned exhaust valve
Faulty catalytic converter
Poor compression
Defective computer
Thread Starter
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Junior Member
Joined: Feb 2011
Posts: 7
Likes: 0
From: Whitestown, IN
quick update: I replaced my coil pack tonight after getting no spark from the number 3 tower. Found a crack in the ceramic on the bottom of the old coil pack directly underneath the number 3 tower.