Question about 2006 Ford F-150
A P0303 code means that the the car's computer has detected
that one of the engine's cylinders is not firing properly. In this
Symptoms may include:
A code P0303 may mean that one or more of the following has happened:
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs).
Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. 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.
Posted on Apr 24, 2010
In addition to what has already been said by techbuster, remeber if a catalytic converter has gone bad usually the vehicle will hardly run after it is driven a short time as the vacumn builds due to the honey comb or pellet interior construction sort of melting down causing the "cat" to clog restricting the exhaust, quick check it using a vacumn gauge at the intake manifold it should drop real fast when the car starts to barely run, most causes of a "cat" meltdown/clog are due to an engine that is dumping too much raw fuel into the cat causing it to clog. Conditions may be fuel injectors being programmed to run rich possibly from a faulty coolant temp sensor that doesn't allow the ECM to realize the vehicle is warmed up and doesn't need the fuel injectors spray pattern to be wide acting sort of the way the old carburated choke systems did to a cold engine sticking and causing a rich condition.
Posted on May 21, 2010
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Posted on Jan 02, 2017
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