I have a service engine soon light problem. When I had it checked, it advised that my timing was advanced, 85K miles, does this mean the timing chain is going, or what? 2002 Chevy Trailblazer straight 6
It could be, check to see the maintenance on the timing belt in your owner's manual. It may be 60,000 miles.
It could only be a sensor, actuator or solenoid for the timing components' of the engine.
Send me the code number and I'll look into it further.