How do you test a Subaru ignition coil pack?
To test a Subaru ignition coil pack, you'll need to follow a few simple steps to ensure the component is functioning properly. Ignition coil packs are responsible for providing the high-voltage spark that ignites the air-fuel mixture in your Subaru's engine, so it's important to diagnose any issues with them promptly.
Steps to Test a Subaru Ignition Coil Pack
- Visually inspect the coil pack: Look for any signs of damage, such as cracks, burns, or loose connections. If the coil pack appears to be in good physical condition, proceed to the next step.
- Check the coil pack's resistance: Use a multimeter to measure the resistance between the primary and secondary windings of the coil pack. The resistance should be within the manufacturer's specified range, typically between 0.5 and 2 ohms for the primary winding and 6,000 to 20,000 ohms for the secondary winding.
- Test the coil pack's output voltage: With the engine running, use a multimeter to measure the voltage output of the coil pack. The voltage should be between 20,000 and 40,000 volts.
- Check for spark: Disconnect the coil pack from the spark plug and hold the coil pack close to a metal surface, such as the engine block. Crank the engine and look for a strong, consistent spark. If the spark is weak or intermittent, the coil pack may need to be replaced.
If the coil pack passes all of these tests, it is likely functioning properly. However, if the coil pack fails any of the tests, it will need to be replaced to ensure proper engine performance and prevent further damage.
Importance of Proper Ignition Coil Pack Testing
Regularly testing the ignition coil pack in your Subaru is essential for maintaining optimal engine performance and fuel efficiency. A faulty coil pack can cause misfiring, reduced power, and even engine damage if left unchecked. By following the steps outlined above, you can quickly and easily diagnose any issues with your Subaru's ignition coil pack and take the necessary steps to address the problem.
How to test a Subaru ignition coil pack?
The only tool you'll need is a digital multimeter to measure resistance. Open your hood and unplug all four wire pin connectors on the coil pack. Plug the multimeter leads into the left two outlets on the face of the coil pack. The resistance reading should be about 0.73 ohms, plus or minus 10%.
How do you check if your coil is burnt?
A change in the taste of e-cigarette vapour is usually the most obvious way to identify when a vape coil has reached the end of its natural lifespan. You may notice an unpleasant, burnt taste to e-liquids when you draw vapour with a spent coil.
Do coil packs go bad often?
Ignition coils generally last 80,000 to 100,000 miles. However, as with most vehicle components, certain conditions like the ones below may cause them to fail sooner.
How do I know when my coil pack needs changing?
Signs of a Bad Ignition Coil
- Illuminated Check Engine Light. With most modern vehicles, a faulty ignition coil is enough to turn on the Check Engine Light.
- Misfiring Engine. If an ignition coil is not working properly, your engine will likely misfire.
- Hard Starts.
- Worsening Gas Mileage.
- Diminished Power.
- Sudden Backfires.
How can you tell if a coil pack is bad visually?
You can perform a visual inspection to look for cracks, burn marks, or carbon tracking. You can also swap the ignition coil to another cylinder to confirm whether it's faulty.
Should you replace all 4 ignition coils at once?
Replacing just one faulty coil might temporarily improve performance, but it could also put extra strain on the remaining coils, leading to further issues down the line. On the other hand, replacing all the ignition coils at once can ensure consistent performance and reliability.
How much does it cost to replace ignition coils on a Subaru?
It can cost anywhere between $80 and $300 to replace an ignition coil. The exact cost depends on several factors, including: Your Subaru model.
What are the signs of a weak coil pack?
- Misfiring Engine : A faulty coil pack can cause the engine to misfire, leading to rough idling, hesitation during acceleration, and overall poor engine performance.
- Decreased Fuel Efficiency
- Check Engine Light
- Increased Emissions
- Potential Engine Damage
- Difficulties Starting the Engine
- Vibration and Noise
What is the easiest way to check an ignition coil pack?
How to test the ignition coil pack?
- Step 1: Locate the ignition coil.
- Step 2: Power balance test.
- Step 1: Make sure your vehicle is turned off and access the ignition coil pack.
- Step 2: Remove an ignition pack.
- Step 3: Run a resistance or ohms reading test (with a multimeter).
How long do Subaru coil packs last?
In general, however, ignition coils can last anywhere between 120,000 to 150,000 miles or five to seven years. It's a good idea to check on them before then, so your mechanic can identify any issues before they negatively affect your vehicle.
