2004 Chevy Trailblazer We had to replace the

the t/b and envoys have known trans problems 1 is torque converter other is sun gear /basket failure --the diesel would cause rough and some performance issues but not really tranny problems have vehicle scanned for trouble codes also the 4x4 module causes headaches such as going into neutral or 4x4 on its own

Have a diagram that shows 1-5-3-6-2-4 as firing order Firing order for 2004 chevy trailblazer 2004 Chevrolet TrailBlazer

Check the timing chain. Some times the chain will shift with worn teeth and get out of synch. This will cause the engine to lose power and back fire. Sometimes with a flame through the carb. I did that one once. Easy fix if it is the problem.

Before any parts are replaced in the HVAC system, try the following procedure to recalibrate the system. Turn all switches and controls to OFF or fully CCW positions, then disconnect the battery for about 2 minutes. Reconnect the battery and turn the ignition to the ON position (don't need to start engine) and don't touch any of the HVAC controls for about 2 minutes. After that try the system again and see if it works correctly, if not, you will need to have a mechanic diagnose it.

The battery light comes on when there is an issue with the charging system. Most likley you have a bad alternator. With the engine running you should see a min. of 13.5 volts at the battery and better yet 14+ volts. If you have 12.5 or less than the alternator is not charging.

Once the vehicle is started the battery is no longer in play. The alternator is what keeps the power supply to the vehicle and recharges the battery for the next time you want to start the vehicle. Once battery voltage drops below 9 volts or so systems start to shut down. Eventually the battery will drain enough that the engine management system can no longer function and the vehicle will stall.

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ONe of the "easy" fixes is buy a can of throttle body cleaner. Remove the air intake near throttle boddy and clean the inside of throttle body as best you can this should help it. If it doesnt have it checked out it could be more advanced problem. Good Luck.

this means you most likely have a parasitic lose this were something is drawing voltage from battery even when car is off

chevy refuses to recall this speedometer. The same part is in several other models and they were recalled. The stepper motor in the gauge cluster is faulty. The dealership will charge around $700 to replace it. I reported it to the gov't agency that handles recalls and chevy in detroit. No results.

I had the same problem with mine and it turned out to be the key switch.

Renew the coolant every 24,000 miles or 2 years which ever comes first.
If your battery is in good condition, there is no need to change it.