2004 CHEVY TRAILBLAZER BOGGS DOWN ... NO POWER

  • Tiny
  • icecreamjoe
  • 2004 Chevrolet Trailblazer

Engine Performance problem
2004 Chevy Trailblazer 6 cyl Four Wheel Drive Automatic 100000 miles

We checked the catalytic converter and it didn't have back pressure. Changed the oxygen sensor. Changed actuaror.
What else could be the problem? When driving won't down shift after accelerates.

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Wednesday, July 14th, 2010 AT 7:22 PM

1 Reply

  • Tiny
  • rasmataz
  • Member

Possibilities: Inspect and test all the following listed below:

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it.

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Wednesday, July 14th, 2010 AT 7:35 PM

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