What does an ignition module do?

The ignition module of your vehicle is the heart of your entire ignition system. Its two main roles are to create a spark strong enough to ignite the air/fuel mixture for combustion and to control the timing of the spark plugs by opening and closing the ignition coil ground circuit.

People Also Asked, What are the symptoms of a bad ignition control module?

Signs of a Bad Ignition Module

  • Acceleration Issues. The vehicle may shake, vibrate or jerk when the gas pedal is pressed. There may be hesitation or lack of power during increases in speed.
  • Temperature Problems. A faulty ignition module can cause a vehicle to overheat.
  • No Power. The engine may turn over without starting.

Also know,

You may ask,

Where is ignition control module located?

The Ignition Control Module (ICM) is located in the distributor housing near the ignition coil. To access the module, remove the distributor cap, rotor, and if equipped, the dust cover.

How much does it cost to replace an ignition control module?

The average cost for an ignition control module replacement is between $274 and $386. Labor costs are estimated between $65 and $83 while parts are priced between $209 and $303. Estimate does not include taxes and fees.

How do you diagnose a bad ECM?

Engine Stalling or Misfiring Erratic engine behavior is another common symptom of a bad or failing ECM. A faulty computer can also be responsible for engine stalling or misfiring, though this tends to be more intermittent. These symptoms may come and go, and may appear to have no pattern to their severity or frequency.

How does the ignition control module work?

The ignition control module switches transistors on and off based on input from the magnetic pulse generator in the distributor. The magnetic pulse generators transmits an AC voltage signal that corresponds with engine speed and the position of the crankshaft position.

How do you test an ignition control module in GM?

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.

What happens when a ignition module goes bad?

One of the first symptoms of a problem with the ignition module are engine performance issues. If the ignition module fails or has any problems it can lead to performance issues with the vehicle, such as misfires, hesitation, loss of power, and even reduced fuel economy.

Does ignition module control fuel injectors?

The ICM doesn’t control the injectors, but the ECM will not pulse them without a signal from the ICM. The ICM monitors the reluctor wheel on the distributor shaft and triggers the ignition coil at the proper moment to send spark out from the coil to the correct cylinder.

How do you test a ignition coil?

Connect your multimeter to the positive terminal or pin of your coil, and to the high output terminal that goes to the spark plug. Most ignition coils should have a secondary resistance falling somewhere between 6,000 to 10,000 ohms;however, refer to manufacturer specifications for the correct range.

How do you check ignition timing?

Connect a timing light to the engine and check the ignition timing. The initial timing should be 12°11°BTDC (Before Top Dead Center). If the ignition timing is not within specifications, loosen the distributor body installation bolt and adjust the ignition timing by turning the distributor.

What can cause an ignition control module to fail?

The cause of an ignition control module failure is often associated with age and damage from heat buildup. The correction for this issue becomes the replacement of the failed component.