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A code P0305 may mean that one or more of the following has happened: 1 Faulty spark plug or wire 2 Faulty coil (pack)3 Faulty oxygen sensor(s) 4 Faulty fuel injector 5 Burned exhaust valve 6 Faulty catalytic converter.
Possible Solutions 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. I've also heard in other cases the problems were faulty fuel injectors.
your code point to your truck is running lean
your codes report that the o2 sensors are sending this code
this does not mean that your o2 is bad
i would look to your MAP sensor and also check your vacuum to the MAP
you may get buy just cleaning it with brake cleaner
but make sure it is dry before you put it back in
if that don't work i would replace the MAP
tell me how you make out
i would check the plug wires and the coils you check the plug wires for bad spots at night start the motor up and look at the plugs if you see a spark arch out the wire and to a peace of metal then the plug wires need to be replace.
Check your air injection pump for a possile leak, or crack in the actual hose running from it. If it's leaking, it causes a reduction in flow to catalytic converter, thus sets that trouble code. As far as code 305 goes, is engine running rough, or have a miss?
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