How do you test a Subaru coil?

Testing a Subaru Coil
To test a Subaru coil, you can follow these steps:
1. Use a Digital Multimeter: You’ll need a digital multimeter to measure the resistance of the coils.
2. Locate the Coil Pack: Open your hood and locate the coil pack. Unplug the coil pack and use the multimeter to measure resistance at the four-wire connector at the face of the coil packs.
3. Measure Resistance: Place the leads of your multimeter to PIN A and PIN B. You should have 0.73 ± 10% between these two pins.
4. Inspect Spark Plugs and Wires: While testing the ignition coils, it’s a good idea to inspect the spark plugs and wires as well.
It’s important to note that the process may vary slightly for different Subaru models, so it’s recommended to verify the resistance specifications for your specific vehicle.

Can I test an ignition coil with a multimeter?

Testing coils with a multimeter for Ohm’s resistance has been around for a long time. While it works to some degree, a major issue is that you are not able to simulate load, or measure the coil during operation, so weak coils that are not performing may still pass this test, but still be bad.

Can one ignition coil go bad?

It’s not always necessary to replace all four ignition coils at once. Typically, if one coil fails, it’s recommended to replace the faulty one as soon as possible to prevent further damage and ensure the engine runs smoothly.

How many ohms should a ignition coil read?

The ohmic resistance of the coil is around 0.2–3.0 Ω on the primary side and around 5–20 kΩ on the secondary side. The winding ratio of primary to secondary winding is 1:100.

Should you replace all 4 ignition coils at once?

Coil packs are reliable and likely to last the lifetime of a vehicle. If anyone goes bad, there is no need to change all of them. However, if one pack starts malfunctioning after the odometer has around 75,000 miles, you should replace them all.

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 is the easiest way to check an ignition coil?

To test for voltage output, connect a spark tester to the high-tension output terminal of the ignition coil. Then, crank the engine and observe the spark tester. If the spark is strong and consistent, the ignition coil is functioning correctly. However, if there’s no spark or a weak spark, the ignition coil is faulty.

Can I drive with a bad ignition coil?

It’s not a good idea to drive it. If the coil completely fails then the engine will stop running. If that happens you’ll have to tow it somewhere. To answer the question, yes you can drive it but it’s not recommended.

How long do Subaru ignition coils last?

60,000 to 100,000 miles
As a rule of thumb, you should replace your ignition coils anywhere from 60,000 to 100,000 miles after installation.

Should I replace all ignition coils or just the bad one?

Replacing one coil might cure the misfire and codes for now, but the other coils could fall prey to the same failure and codes. Replacing all for the coils at a time will save a comeback. This is why some ignition coil manufacturers package coils in sets.

How do I check if my ignition coil is bad?

Signs of a Bad Ignition Coil

1. Illuminated Check Engine Light. With most modern vehicles, a faulty ignition coil is enough to turn on the Check Engine Light.
2. Misfiring Engine. If an ignition coil is not working properly, your engine will likely misfire.
3. Hard Starts.
4. Worsening Gas Mileage.
5. Diminished Power.
6. Sudden Backfires.