Misfire cylinder p0303
SOURCE: error code p0303 cylinder 3
A P0303 code – The #3 cylinder is in question. The computer has noticed that one of the cylinders is firing improperly.
Symptoms may include:
Poss. Causes:
A code P0303 may mean that one or more of the following has occurred:
Poss. Solution(s):
If you are not having any of the above problems, then I would recommend resetting the code and see if it comes back.
If you experience / notice the engine is stumbling or hesitating, check the condition of the Spark Plug wires and boots. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. Another possibility could be faulty fuel injectors..
Good luck. I hope this helps.
SOURCE: ODB code P0303
Replace Plugs / Wire (or Coil #3 if it's coil on plug). DO NOT USE Auto Lite Platinum plugs, use factory VW NGK plugs. Otherwise it'll run like ****.
SOURCE: 2001 Jeep Cherokee with 6 cylinder engine -- PO306 code cylinder
Plug, plug wire, plugged or open fuel injector. are the most likely.
SOURCE: P0308 cylinder 8 misfire detected? How to repair?
Fuel injector cleaner commonly has a low success
rate, and will not help if it's more than one cylinder that is
missfiring. The fact that you have a "rattle" noise, leads me to beleive
the engine is not receiving fuel on one or more cylidners. If it is all
the cylinders, than the fuel pump may be the culprit, or the fuel pump
circuit. But if only one cylidner is missfiring than it is a possibly an
injector. A code P0300 refers to all cylinder missfires, and any code
between P0301-P0308 distinugiushes a particular cylinder.
Misfiring
1- a general electrical tune-up (spark plugs, wire set, cap &
rotor) is a basic start to cure this issue. Wiggle the dist shaft while
you are in there, if you have one.
2- Then a good carbon cleaning / throttle-body cleaning.
3- Vacuum leaks at any of the hoses that connect to the Intake
manifold; especially the MAP sensor connection.
4- If that does not help then the O2 sensor could be bad or drifting.
5- Funky coil/coil-packs
6- Theoretically a microsecond glitch in either the cam or crank
shaft sensors would cause this, but I am not aware of this as a typical
cause.
7- Lastly a funky PCM but again it is not common for this to cause
miss-firing.
Note for the V8 then also:
a) bad erg valve (this dilutes the combustion gases and hence raises
the combustion temp
b) a leaky plenum/Intake manifold gasket. Leaking Intake gasket
symptoms
Also can check the TSB 18-48-98 Ignition System Cross Fire/Secondary Ignition Wire Induction (Complete Version )
Hope help with this (remember rated this). Good luck and have a nice day.
SOURCE: error code p0303 cylinder 3
add injector cleaner. if your car has sat at allfor a little bit of time then more than likely your injector is a little sticky. just add the injector cleaner then fill the tank if problem doesnt go away the look into other things
A code P0303 may mean that one or more of the following has happened:
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