* Fuel Delivery:
* Fuel pump: Is the fuel pump working? Can you hear it prime when you turn the key to the "on" position (before cranking)? A weak or failed fuel pump is a common cause.
* Fuel filter: Even with a recent tune-up, a clogged fuel filter can restrict fuel flow.
* Fuel injectors: Are the injectors spraying fuel? This requires a little more diagnostic work, possibly involving a fuel pressure test and/or checking for injector pulse with a noid light.
* Ignition System (even after a tune-up):
* Distributor cap and rotor: While you may have replaced them, ensure they're correctly installed and aren't cracked or worn. A simple visual inspection is a good first step.
* Ignition module (pick-up coil): This is part of the distributor and can fail independently.
* Crank sensor: A faulty crank sensor prevents the computer from knowing the engine's rotational position, preventing the spark.
* Wiring: Check for any damaged or loose wiring, especially in the ignition system. Corrosion is a common problem in older cars.
* Other Possibilities:
* Security system (if equipped): If your Camaro has an aftermarket alarm or immobilizer, it might be preventing the engine from starting.
* Computer (ECM): Although less likely after a recent tune-up, a failing ECM could cause starting problems.
* Battery/alternator: Though it cranks, a weak battery or faulty alternator might not provide enough power for ignition.
Troubleshooting Steps:
1. Check for Spark: This is crucial. Use an inline spark tester (available at most auto parts stores) on a spark plug wire to see if you're getting spark at the plugs. If not, you'll need to focus on the ignition system components listed above.
2. Check Fuel Pressure: If you have spark, the next step is to check fuel pressure using a fuel pressure gauge. This confirms if the fuel pump and injectors are delivering fuel.
3. Listen for the Fuel Pump: Turn the key to the "on" position (but don't crank the engine). Do you hear the fuel pump whirring for a few seconds? If not, it could be bad.
4. Visual Inspection: Carefully examine all wiring and connections in the ignition system for damage or corrosion.
5. Check Codes: If your Camaro has a check engine light (CEL), use an OBD1 scanner (specific to 1989 cars) to read any diagnostic trouble codes. This can provide valuable clues.
If you're not comfortable with these checks, it's best to take the car to a mechanic familiar with older Camaros. Troubleshooting electrical issues can be complex, and improper diagnostics can lead to further damage. Starting with the spark test and fuel pressure check will be your best approach.
