* Incomplete Repair: Even though you replaced the distributor cap, rotor, and plugs, there could still be issues:
* Worn or Damaged Distributor: The distributor itself might be failing, even if the cap and rotor are new. Worn internal components can affect spark timing and strength.
* Bad Spark Plug Wires: These are often overlooked. Cracks, fraying, or poor connections in the wires can lead to misfires. Inspect them closely for damage.
* Incorrect Spark Plug Gap: If the gap on the new spark plugs isn't properly set, it can cause misfires. Check your owner's manual for the correct gap.
* Distributor Alignment: The distributor might be slightly out of alignment, affecting spark timing. This is less likely if it was correctly installed but worth considering.
* Other Potential Misfire Causes:
* Ignition Coil: A failing ignition coil can't provide enough power to all the spark plugs consistently, resulting in misfires.
* Worn or Failing Ignition Module: This part controls the ignition coil. A faulty module can lead to inconsistent spark delivery.
* Fuel Delivery Problems: A fuel injector issue, clogged fuel filter, or low fuel pressure can cause misfires. A flashing check engine light is less common with fuel problems, though.
* Sensor Problems: Various sensors (like the crankshaft position sensor or mass airflow sensor) can send incorrect data to the computer, leading to misfire codes.
What to Do:
1. Read the Trouble Codes: The flashing check engine light is giving you valuable information. Use an OBD-II scanner (available at most auto parts stores) to read the trouble codes. This will pinpoint the specific problem area.
2. Inspect the Spark Plug Wires: This is the easiest and cheapest thing to check first. Look for cracks, fraying, or any signs of damage.
3. Check the Spark Plug Gap: Ensure the gap is set correctly according to your owner's manual.
4. Visual Inspection: Carefully examine all ignition components, looking for any obvious signs of damage or wear.
5. Professional Diagnosis: If you're unable to identify the problem after checking these items, take your Blazer to a trusted mechanic for a proper diagnosis. They'll have the tools and expertise to pinpoint the issue and make the necessary repairs.
A flashing check engine light usually indicates a more serious problem that needs attention quickly to prevent further damage. Don't ignore it.
