What are the symptoms of a bad HEI coil?
What are the symptoms of a bad HEI coil?
Bad HEI ignition distributors give off some warning signs that can be diagnosed by the vehicle owner.
- Engine Fails to Start.
- Plug Wire Engine Miss.
- Reduced Fuel Economy.
- Weak Spark.
- Electrical Arc and Shorts.
- Hard Starting.
- Smog Check Failure.
How do you test a HEI distributor coil?
To test the resistance of the coil, remove the coil cover so you can see the red and yellow wire. Using the multi-meter set on the ohms setting, touch the positive lead to the red wire terminal and the negative lead to the yellow wire terminal. Testing the secondary circuit of the coil.
How do you test a GM ignition coil with a multimeter?
Turn the multimeter on. Attach the its red lead to the right terminal, then attach the black lead to the left terminal. Read the voltage displayed on the multimeter. Your coil pack is properly powered if the reading is 11 to 12 volts.
How do you test a GM ignition coil?
Place a lead from the ohmmeter on either side terminal and one in the center high tension terminal. Read the ohms off the meter. You are looking for 7500 to 10,500 ohms, and if the reading falls outside that range, it indicates a defective coil.
What does a HEI module do?
With an electronic module, an HEI can safely operate at much higher current loads. More power applied across the primary circuit of the coil means the coil can apply greater spark energy to the spark plugs. This additional power ensures more complete combustion at both idle and at wide open throttle.
Why is my distributor not getting spark?
A Bad Rotor Or Distributor Cap (cracks or carbon tracks that are allowing the spark to short to ground). Often the distributor cap is suspect. Consequently, it could short out the coil voltage and cause; a faulty connection inside the terminal of the distributor cap. The result is a misfire in the spark plugs.
How do you check a distributor pickup coil?
On distributors with the pickup separate from the module assembly, you can check the pickup using your Ohm meter. Connect the leads from your Ohm meter to the 2 leads of the pickup. If you show a resistance of 50 to 200 Ohms, the pickup is functioning correctly.
How do you test a GM ignition Control Module?
If your GM vehicle has a slow or hard start, the ignition control module should be tested with an electrical test light.
- Open the hood of the GM vehicle. Locate the ignition module.
- Connect the positive test light lead to the ignition module signal wire.
- Ask a partner to crank the engine numerous times.
