What to do When Your Subaru Legacy Won't Start but Just Turns Over

By Nick Marchenko, PhD

So you're sitting in your Subaru Legacy, ready for your next adventure, but there's just one little problem: it won't start. Instead, you hear the engine turning over but it refuses to come to life.

Frustrating, right? But you needn't worry because we can help with this problem and get your Legacy back on the road as soon as possible.

Checking the battery and electrical system

Let's begin with the basics of a battery and electrical system before we move on to the nitty-gritty. When a car doesn't start, these are usually the ones to blame. You must do the following:

Test the battery voltage

Check your battery's voltage by using a multimeter. Ideally, the voltage should be somewhere in the neighborhood of 12.6 volts. A significant drop can mean that the battery is weak and needs replacing.

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Inspect battery connections

Ensure that the battery terminals are well secured and resistant to corrosion. Disconnected connections could hinder the flow of electricity, leading to problems with starting.

Assess the alternator

It's a good idea to check the alternator while you're there. The alternator may fail to charge the battery properly, leading to a lack of power for starting. It could be a sign of trouble if you notice dim lights or flickering alternators on your dashboard.

Assessing the fuel system

It's time to switch our attention to the fuel system if the battery and electrical systems are all right. You're supposed to do the following:

Check fuel levels

It's clear, but sometimes it's the simple solutions that we miss. Before assuming that there's a bigger problem, you need to make sure your Subaru has plenty of fuel. It's embarrassing to run out of gas; believe it or not, everyone has been there.

Inspect the fuel pump

When you turn the ignition to the "ON" position, listen closely for a faint humming sound. If you're not hearing anything, it might be because the fuel pump is malfunctioning. A failure of the fuel pump may prevent it from reaching the engine, and this could lead to a starting problem.

Examine fuel filters

A clogged fuel filter can prevent the flow of gasoline, which may result in an inability to start. If needed, you should check and replace your fuel filters. They are like air filters for your car's fuel system, so they should be loved too.

Exploring the ignition system

Let's take a look at the ignition system, the spark that ignites the magic of combustion. Here are the things to do:

Testing the spark plugs

Look for signs of wear or damage on the spark plugs. The ignition system may be unable to function properly because of defective spark plugs. It's time for some new ones if they look tired. With a smooth start and better performance, your vehicle will thank you.

Checking the ignition coils

The ignition coils are the stars of an ignition system, which in turn gives rise to a powerful voltage that is needed for engine firing. Your Subaru will be sulking in silence if they don't work right. To ensure that the electric rock concert you need is delivered to your engine, test the ignition coils.

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Inspecting the ignition switch

Last but not least, examine the ignition switch. A faulty switch may prevent the electrical current from reaching the ignition system, leaving you with a sad, silent Subaru. If you suspect a malfunctioning switch, it might be time to call in the professionals for some expert advice.

Troubleshooting the starter motor

If your Subaru Legacy won't start but just turns over, the problem might lie with the starter motor. Some steps you can take to resolve this problem are given below:

1. The first thing you should do is check if there is power reaching the starter motor. Grab your trusty multimeter and test the voltage at the starter terminals. If there's no power, the issue may be with the ignition switch, battery connections, or a blown fuse.

2. Next, inspect the starter solenoid. This little device is responsible for engaging the starter motor when you turn the key. Check for any corrosion, loose connections, or damage. If everything looks good, move on to the next step.

3. Lastly, make sure all the connections to the starter motor are secure. Sometimes they can become loose due to vibrations or wear and tear. Tighten any loose connections and give it another try. If the starter motor is still not working, it may be time for a replacement.

Apart from that, consider checking the crankshaft position sensor. This sensor detects the rotation of the crankshaft and helps the computer determine the precise moment to ignite the fuel. Make sure the sensor is not damaged or covered in grime that could affect its performance.

Similar to the crankshaft position sensor, the camshaft position sensor aids in the ignition process by detecting the position of the camshaft. Check for any visible damage or contamination that could interfere with its operation.

Additional factors to consider

In some cases, there might be other factors contributing to your Subaru Legacy's starting problem. Don't overlook these possibilities.

If you have an engine immobilizer, it could be preventing your car from starting. Ensure that your key is properly recognized by the immobilizer system. If you're uncertain, consult your vehicle's manual or a Subaru dealership for guidance.

A worn or broken timing belt can wreak havoc on your engine's performance. If the timing belt is damaged, it can result in poor ignition timing and a failure to start. Check if the belt is in good condition and properly aligned.

Believe it or not, the quality of your fuel can impact your car's starting ability. Contaminated or old fuel can cause engine misfires or difficulty igniting. Try using high-quality fuel and consider adding a fuel system cleaner to remove any deposits that may affect starting. Basically, you are done!

Nick Marchenko, PhD

Industrial Engineer & Automotive Content Specialist

Nick writes in-depth guides on car clubs, engine specs, vehicle ownership, and modifications, combining engineering knowledge with automotive passion.

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