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  1. Problem suddenly with timing, valves or head.

    OEM Issues
    Problem suddenly with timing, valves or head *WITH VIDEO* Hi everyone, suddenly have a problem today with the trailblazer some history .. have the car already almost a year and a half . Its got 124,000KM original. It's a chevy trailblazer 2003 with a 4.2L inline 6 Vortec block. since more...
  2. crankshaft sensor replacement

    OEM Issues
    I'm completely ignorant and can't even find an engine diagram online to tell me where the crankshaft sensor is. Help? I have the part, got it at Auto Zone after the check engine light indicated a problem and this is what they thought was the most likely issue. I just need to find where it is and...