What To Know
- To test the starter solenoid, use a voltmeter to check for voltage at the solenoid terminal when the ignition key is turned to the “Start” position.
- A clogged fuel filter can restrict the flow of fuel to the engine, causing it to stall or not start.
- To test the ignition switch, use a voltmeter to check for voltage at the ignition switch terminal when the key is turned to the “Start” position.
If your Subaru Forester has left you stranded, with the engine refusing to crank over, it can be a frustrating and stressful experience. This comprehensive troubleshooting guide will walk you through the most common causes of a Subaru Forester not starting and provide detailed steps to resolve the issue.
Battery Issues
Dead Battery
A dead battery is the most common reason why a Subaru Forester won‘t start. Check the battery terminals for corrosion or loose connections. If the terminals are clean and tight, use a voltmeter to test the battery voltage. A healthy battery should read around 12.6 volts. If the battery voltage is below 12 volts, it needs to be replaced.
Faulty Battery Cables
Even if the battery has a good charge, faulty battery cables can prevent the current from reaching the starter. Inspect the battery cables for any signs of damage or corrosion. Replace any damaged cables.
Starter Issues
Bad Starter
A faulty starter is another common cause of a Subaru Forester not starting. The starter is responsible for engaging the flywheel and turning over the engine. If the starter is not working properly, the engine will not crank. To test the starter, tap it lightly with a hammer while someone tries to start the car. If the engine starts, the starter is likely faulty and needs to be replaced.
Bad Starter Solenoid
The starter solenoid is a switch that activates the starter motor. If the solenoid is faulty, it will not send power to the starter motor, preventing the engine from starting. To test the starter solenoid, use a voltmeter to check for voltage at the solenoid terminal when the ignition key is turned to the “Start” position. If there is no voltage, the solenoid is likely faulty and needs to be replaced.
Fuel Issues
Empty Fuel Tank
An empty fuel tank is an obvious but often overlooked cause of a Subaru Forester not starting. Ensure that the fuel tank has enough gasoline to run the engine.
Clogged Fuel Filter
A clogged fuel filter can restrict the flow of fuel to the engine, causing it to stall or not start. The fuel filter should be replaced according to the manufacturer’s recommended maintenance schedule.
Faulty Fuel Pump
A faulty fuel pump can fail to deliver fuel to the engine, resulting in a no-start condition. To test the fuel pump, listen for a humming sound when the ignition key is turned to the “On” position. If there is no humming sound, the fuel pump may be faulty and needs to be replaced.
Ignition Issues
Faulty Ignition Switch
The ignition switch is responsible for sending power to the starter and other electrical components. If the ignition switch is faulty, it can prevent the engine from starting. To test the ignition switch, use a voltmeter to check for voltage at the ignition switch terminal when the key is turned to the “Start” position. If there is no voltage, the ignition switch is likely faulty and needs to be replaced.
Bad Ignition Coil
The ignition coil provides the high voltage necessary to spark the spark plugs. If the ignition coil is faulty, it will not produce enough voltage to ignite the fuel, causing a no-start condition. To test the ignition coil, use a spark plug tester to check for spark at the spark plugs. If there is no spark, the ignition coil may be faulty and needs to be replaced.
Faulty Spark Plugs
Spark plugs are responsible for igniting the fuel in the engine cylinders. If the spark plugs are worn or fouled, they may not produce a strong enough spark to ignite the fuel, causing a no-start condition. To test the spark plugs, remove them from the engine and inspect them for wear or damage. Replace any faulty spark plugs.
Other Possible Causes
Bad Engine Grounds
Engine grounds provide a path for electrical current to flow back to the battery. If the engine grounds are loose or corroded, it can prevent the starter from engaging or the engine from running properly. Check all engine grounds and clean or tighten any loose or corroded connections.
Anti-Theft System Issues
Some Subaru Foresters are equipped with an anti-theft system that can prevent the engine from starting if it detects unauthorized access. If you have recently had your Forester’s anti-theft system serviced or repaired, it may need to be reprogrammed.
Computer Issues
In rare cases, a faulty engine control unit (ECU) or other computer module can prevent the Subaru Forester from starting. If all other possible causes have been ruled out, you may need to have the vehicle diagnosed by a qualified mechanic using a diagnostic scanner.
Summary and Next Steps
If your Subaru Forester does not start, there are several possible causes to consider. By following the troubleshooting steps outlined in this guide, you can identify and resolve the issue to get your vehicle back on the road. If you are unable to diagnose and fix the problem yourself, it is recommended to seek assistance from a qualified mechanic.
What You Need to Know
Why won’t my Subaru Forester start when I turn the key?
There are several possible reasons why your Subaru Forester won‘t start when you turn the key, including a dead battery, faulty starter, fuel issues, ignition problems, or other possible causes.
How much does it cost to fix a Subaru Forester that won’t start?
The cost to fix a Subaru Forester that won’t start will vary depending on the cause of the issue. Simple repairs, such as replacing a dead battery, may cost around $100-$200. More complex repairs, such as replacing a faulty starter or fuel pump, can cost several hundred dollars or more.
What are the signs of a bad starter on a Subaru Forester?
Signs of a bad starter on a Subaru Forester include:
- The engine cranks but does not start
- Clicking or grinding noises when trying to start the engine
- The starter motor does not engage the flywheel