Question about Chevrolet Suburban 2500

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I have a 2002 Chevy Suburban the check engine light flashes it shows a P0300 code..Sugish..No top end power..

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  • auntb41565 May 27, 2010

    p0300 code multiple misfire detected

  • auntb41565 May 27, 2010

    p0300 code multiple misfire detected

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Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.
A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

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 P0300 may mean that one or more of the following has happened:
  • Faulty spark plugs or wires
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuelI have a 2002 Chevy - 2_bing.gif injector(s)
  • Burned exhaust valve
  • Faulty catalytic convertor(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.

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Posted on May 27, 2010

  • Jeremy Reddick
    Jeremy Reddick May 27, 2010

    Yes the code that I gave you explains what you can check for. That is what any mechanic would look for and what they would do. There is really nothing else you can do without actually getting your hands dirty and looking around for the possible issues

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That code with your dianogstics explained tells me the catalytic convertor is plugged.

Posted on May 27, 2010

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