1. The Basics (Always start here!)
* Fuel:
* Is the fuel tank empty? Check your fuel gauge.
* Is there fuel getting to the engine? Look for leaks in the fuel lines, especially near the fuel pump. You could also try to smell for gasoline near the engine.
* Fuel pump fuse: Check the fuse box for a blown fuel pump fuse.
* Spark:
* Spark plugs: Remove a spark plug wire and hold the end of the wire near a metal part of the engine while someone cranks the engine. You should see a spark jump. If not, there might be a problem with the spark plugs, wires, distributor cap, or ignition coil.
* Battery:
* Battery terminals: Clean the battery terminals with a wire brush to ensure a good connection.
* Battery voltage: Use a voltmeter to test the battery voltage. It should be at least 12.5 volts when the engine is off and around 14 volts when the engine is running.
2. More In-Depth Checks:
* Fuel pressure: If you have a fuel pressure gauge, test the fuel pressure at the fuel rail. This will verify if the fuel pump is delivering adequate pressure.
* Air intake:
* Air filter: Make sure the air filter isn't clogged.
* Intake manifold leaks: Look for cracks or loose connections on the intake manifold.
* Ignition system:
* Distributor cap and rotor: Inspect these components for wear, cracks, or corrosion.
* Ignition coil: If your Suburban has a distributor, check the ignition coil for signs of damage.
* Crank sensor: A faulty crank sensor can prevent the engine from firing.
* Engine control module (ECM): A faulty ECM can prevent the engine from starting.
3. Don't Forget the Obvious
* Gas cap: Make sure your gas cap is securely closed. A faulty gas cap can cause a vacuum leak in the fuel tank, preventing the engine from starting.
* Security system: Check if your Suburban has an immobilizer system that might be preventing the engine from starting.
Troubleshooting Tips:
* Use a code reader: If you have a code reader, check for any diagnostic trouble codes (DTCs) stored in the ECM. These codes can provide valuable clues about the problem.
* Consult a mechanic: If you're not comfortable troubleshooting the problem yourself, or if you've checked all the basics and still can't figure out the problem, take your Suburban to a qualified mechanic.
Important Safety Note:
* When working on any automotive system, always disconnect the battery negative terminal before working on any electrical components. This will help prevent electrical shock.
* Be careful when working with gasoline. It is highly flammable and should be handled with care.
