1. x1078p

    x1078p New Member

    i have a 2001 chevy tahoe with a po300 code ive changed the spark plugs and the wires and the coils are getting a good spark what else could i check
  2. bill190

    bill190 Rockstar 100 Posts

  3. Jimmiee

    Jimmiee Epic Member 5+ Years 1000 Posts

    If your ignition is all OK you may have a dirty injector. Have you ever cleaned your injectors or added any injector cleaner to the gas tank?
  4. J-wall

    J-wall New Member

    I am dealing with that problem. I have changed the plugs, wires, air filter, fuel filter, fuel pump (stupid decision), and two coils - finally like a smart person I took it to the dealer for a diagnostic because the light kept staying on. They said it was a leak at the intake gasket, so I am in the process of changing that. Good luck.

    Auto Zone only gave a PO300, I took it to a garage and they said it was on coils 1 & 3 and after that coil swap, it came on again and moved to coils 5 & 8, hence the trip[ to the dealer.

    I have a 2004 Tahoe, 5.3 flex
    Last edited: Jul 30, 2009

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