Question about Oldsmobile Alero

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A p200 code has came on the scanner and i have intermintent stumbbling. I have put new spark plugs in and replaced the coil pack because i had mutple miss firing code po 300. I cleared the codes and the car runs much better but i still get a rough idle and stumbling but not constant .runs fine for a day or two then it sounds like it is missing. but know codes have come up. 1999 alero 2.4 l THKS

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These have whats called a quad driver circuit in the computer and is sounds like it might be on the fritz, will require pcm replacement most likely

Posted on Mar 28, 2011

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After changing the coil pack and spark plug, why is it still skipping?


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DAEWOO LEGANZA P0303


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 case it's cylinder #3.
Symptoms may include:
  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present
A code P0303 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
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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
.


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