Question about 2002 Pontiac Grand Am

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The car starts but runs really rough sounds like it's not firing properly

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  • Pontiac Master
  • 17,970 Answers

Its possible that you have any engine light ON, and one code P0300 there; may mean that one or more of the following has happened:

  • Faulty spark plugs or wires
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector(s)
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Stuck/blocked EGR valve / passages
  • Faulty camshaft position sensor
  • Defective computer

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.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Also, you need to check firing order previously.

Hope helps (remember rated this).

Posted on Jul 09, 2010

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  • Pontiac Master
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The first thing to do is have the computer scanned to see which cylinders are misfiring then look at plugs and plugwires or coils. when was the last tune up? maybe its due for a tune up . this is where i would start.

Posted on Jul 09, 2010

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