1996 Nissan Maxima Clinder #3 misfire

  • 6 CYL
  • FWD
  • 117,000 MILES
One day after accelerating 4500-5000 rpm's the engine started to vibrate and then a while later the check engine light came on. Took it to autozone and they said a cylinder #3 misfire was the problem. I changed the spark plugs, but to no avail. The problem still occurs. Also has trouble starting and sometimes has trouble idling. Any ideas on what to do?
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Saturday, December 13th, 2008 AT 11:39 AM

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P0303 Code - Cylinder #3 Misfire
Technical Description

What does that mean?

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
* 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.
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Sunday, December 14th, 2008 AT 5:02 PM

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