Manufactured by General Motors Co., the Chevy Blazer is considered a mid-sized sport-utility vehicle, or SUV. If the engine on your Chevy Blazer will not start, the problem generally can be found with your starter, battery, spark plugs or fuel line. Diagnosing the problem yourself will allow you to better decide if the repair is a do-it-yourself project or if you will need the help of a professional.
Check if there are any codes that your Blazer is transmitting from its on-board computer. In newer model Blazers, the dashboard will show error codes. In older models, you will have to use an OBD tool that can be found at auto parts stores. Plug the OBD tool into the port to the left of the fuse panel, which is under the steering wheel. Turn the key in your ignition to "ON" and turn the OBD tool on. Wait for the OBD tool to say "OK" and then turn tool and car off. Turn OBD back on, press "Menu" and then "Stored Codes." The computer will have transmitted any trouble codes to your Blazer. Some common codes include P1000, engine warm-up; P1100 for electrical systems; P1200 for fuel line; and P1300 for spark plugs.
Check the battery of your Blazer. Open the hood and check the connections to see if they are loose or corroded. Clean them or tighten them as needed. Turn the key in the ignition to the "ON" position, but do not start the car. The dashboard lights should come on. If no lights are present, your battery is drained or dead and will need replacing or recharging.
Remove the spark plugs from your Blazer and touch the wire to a metal surface. If a spark occurs, your spark plugs are fine. If there is no spark, your Blazer's engine is not igniting properly due to faulty spark plugs, which should be replaced.
Turn the key to start the car. If your key will not turn, your wheels have become locked. Wiggle the key in the ignition gently while turning the steering wheel back and forth. The wheels will unlock and the car can then be started.
Listen to sounds from your Blazer when you are attempting to start your car. No noise often indicates an ignition problem. Clicking noise indicates a faulty starter. If you hear a thumping or knocking, your fuel pump or one of its components is most likely the culprit.
