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Question edited for clarity. P codes for DTCs must have upper case P.
All questions need FULL 'year make model'.
White smoke is steam, and this is normal at this time of year and is mentioned on this website a LOT at this time of year. Gasoline has weather in it at molecular level and is burned off as steam.
P0300 unknown random misfire
P0303 Misfire on Cylinder 3
P0304 As above on 4
The P0455 has nothing to do with a air intake leak ! An it would have nothing to do with a P0302 . A air leak , vacuum leak would cause a P0300 random misfire . You have a coil or spark plug wire or spark plug breaking down at higher RPM ! A vacuum leak would not affect higher speed . P0455 Evaporative Emission Control System Leak Detected Gross Leak
What do you need fuse box an wiring diagrams for ? P0301 an P0308 are misfire codes . Has nothing to do with fuse , spark plugs ,spark plug wires etc.... P0301 through P0310 - Misfire Detection Monitor
The misfire detection monitor is designed to monitor engine misfire and identify the specific cylinder in which the misfire has occurred. Misfire is defined as lack of combustion in a cylinder due to absence of spark, poor fuel metering, poor compression, or any other cause.
Ignition system
Fuel injectors
Running out of fuel
EVAP canister purge valve
Fuel pressure
Evaporative emission system
Base engine
The MIL will blink once per second when a misfire is detected severe enough to cause catalyst damage. If the MIL is on steady state, due to a misfire, this will indicate the threshold for emissions was exceeded and cause the vehicle to fail an inspection and maintenance tailpipe test.
P0301 cylinder # 1 misfire !
P030x - Cylinder x Misfire Detected
Description:
NOTE: x represents cylinder number 1 through 9.
The misfire detection monitor is designed to monitor engine misfire and identify the specific cylinder in which the misfire has occurred. Misfire is defined as lack of combustion in a cylinder due to absence of spark, poor fuel metering, poor compression, or any other cause.
Possible Causes:
Ignition system
Fuel injectors
Running out of fuel
EVAP canister purge valve
Fuel pressure
Evaporative emission system
EGR system
Base engine
Diagnostic Aids:
The malfunction indicator lamp (MIL) blinks once per second when a misfire severe enough to cause catalyst damage is detected. If the MIL is on steady state due to a misfire, this indicates the threshold for emissions was exceeded and caused the vehicle to fail an inspection and maintenance tailpipe test.
Application Key On Engine Off Key On Engine Running Continuous Memory
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GO to Pinpoint Test HD .
Could be an ignition coil !An to replace it the intake manifold has to come off !
All the P0300 codes are engine miss codes. The P0455 is a catalyst inefficiency code and the P0172 code is a rich mixture code. All of these could be caused by faulty oxygen sensors. What kind of car, engine size and mileage is it?
P0445 Evaporative Emissions System Purge control valve circuit shorted
I guess the first thing i would do, is insure that all the maintenance on this vehicle was up to date. Do an oil change and a tune up. Make sure you use decent spark plugs as a fouled plug or bad oil could cause a misfire. After you do the tune up, try running it some more, if the problem persist, you may end up having to replace the coil.
The evaporateemission leaks. These, especially the the 442 can be either a loose gas cap or a small leak in the vacume system. Insure the cap is tight passed several clicks and listen the the motor as it runs and try to hear any leaks. If you find a leak replace the faulty lines. Also inspect the vacume line for cracks and breaks.
Wish you luck, we are hear if you need more help. Thanks for coming to FixYa!!
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