Coolant Leaking From Intake Gaskets (GM 3.1L, 3.4L) (at: ).Engine Compression Test GM 3.1L, 3.4L (at: ).Fuel Injector Resistance Test GM 3.1L, 3.4L (at: ).Troubleshooting Misfire Codes (GM 3.1L, 3.4L) (at: ).How To Do A Cylinder Balance Test (GM 3.1L, 3.4L) (at: ).Troubleshooting A Hard To Diagnose Misfire Case Study (GM 3.1L, 3.4L) (at: ).The following tutorials may also be of help: To see the complete list of 3.1L and 3.4L test articles, go to the GM 3.1L, 3.4L Index Of Articles. If your vehicle does not start and you need to test the ignition control module (ICM) or the crankshaft position sensor on this type of Direct Ignition System, see this tutorial here: Testing The Ignition Module And Crank Sensor (GM 3.1L, 3.4L). IMPORTANT: Before we go on, let me tell you that this article only tests for a bad ignition coil pack(s) and is geared more toward solving a misfire condition in which the car (or minivan or truck if you're driving an Isuzu) starts and runs but runs with a misfire. You can find this tutorial in Spanish here: Cómo Probar las Bobinas de Encendido (GM 3.1L, 3.4L) (at: ). TEST 5: Verifying The Ignition Coil's Switching Signal.TEST 4: Verifying That The Ignition Coil Is Receiving 12 Volts.TEST 3: Testing Spark At Two Adjacent Towers Of Same Coil.TEST 2: Testing Spark At The Ignition Coil Tower.TEST 1: Testing Spark At The Spark Plug Wire.Where To Buy The Ignition Coils And ICM And Save.Safety Precautions And Guidelines When Testing The Coil Pack.What Tools Do I Need To Test The Ignition Coil Packs?.Basic Working Theory Of The GM 3.1L And 3.4L Ignition System.
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