Why is my ignition coil not working on my Blazer?

Touch the LED light’s positive lead to the battery’s positive terminal, then crank the engine again. If the light flashed on and off while you cranked the engine, then the ignition control module is bad.

What should ignition voltage be on Blazer 4.3?

With the ignition key in the “on” position, place the black probe lead on the battery’s negative terminal, then poke the red lead into the A-wire (pink) — you should see between 10 to 12 volts.

Why is my Chevy 4.3 engine still running?

Checking your vehicle’s fluid levels is always a good idea to maintain the overall longevity of the engine. Once you have ruled out all the basics, you can go back to what the Chevy 4.3 engine is known for: bad idle air control valves and throttle control switches.

What kind of engine does GM Blazer 4.3 have?

So, GM’s own “three-quarter small-block” seemed like a natural fit for the chassis. Essentially a 350 V-8 with two cylinders hacked off, the resulting 4.3-liter was powerful, compact, and had an exhaust note unlike anything this side of a V-8.

How to troubleshoot ignition system on Chevy Blazer?

Remove the coil wire from the coil, and hold the 12-volt test light close to, but not touching, the secondary coil tower that the coil wire was plugged into. Turn the ignition to the “Start” position and watch the coil. A bright spark should jump from the coil tower to the test light.

What to do if your blazer has no power?

If no power is present, replace the brown fusible link on the back of the Blazer’s starter. If power is shown on one wire and ground is shown on the other wire, replace the coil. Remove the electrical connector from the coil and back-probe the ground wire.

How does the ignition work on a S-10 Blazer?

Troubleshooting the ignition system in your S-10 Blazer begins with a basic understanding of how the system works. Electrical power is supplied to the primary coil of your ignition coil by the ignition module, generating a magnetic field around the secondary coil in the ignition coil.

What should the coil voltage be on a blazer?

Now, touch the red DMM lead to the battery’s positive terminal, and poke the black lead into the C-wire (black with white stripe); again, you should see between 10 to 12 volts. If you didn’t get these results, then your problem is the power supply, not the coil/module.

Can a bad ignition coil cause a car to not start?

This article will take you step by step through the whole process of diagnosing and troubleshooting a bad ignition control module and ignition coil. The ignition control module (ICM) and ignition coil tests in this article assume that your vehicle is Cranking but NOT STARTING due to a NO SPARK Condition.

What are the symptoms of a bad ignition module?

Symptoms Of A Bad Ignition Module And Ignition Coil Generally, when the ICM or the ignition coil fails, your GM car or truck will Crank but NOT START. Specifically, the ignition coil will not spark.

What makes the ignition coil start to spark?

Also, after receiving the pick up coil signal, the ignition control module starts to switch the primary current (of the ignition coil) On and Off. As you might already know, it’s this ‘Switching Signal’ that makes the ignition coil start sparking away.

Which is spark tester do you need for ignition coil tower?

This is a pretty easy test, but it must be done with a spark tester. You can find the test steps here: TEST 4: Spark Test At Ignition Coil Tower (this test belong to this tutorial: How To Test A Misfire / No Spark-No Start Condition (4.3L, 5.0L, 5.7L 96-04) ).

Why is my ignition coil not working on my Blazer?