2007 Subaru Forester Engine Is Stalling

Common Causes of Engine Stalling in Your 2007 Subaru Forester and How to Resolve Them

Find Repair Location
Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Fuel System
0%
15% chance it's the
Air Intake System
0%
55% chance it's
Something else
The most common reasons a 2007 Subaru Forester engine is stalling are the fuel system, the air intake system, or the ignition system.
  • Fuel System: A clogged fuel filter or failing fuel pump can restrict fuel flow, resulting in poor engine performance and starting issues.
  • Air Intake System: A dirty or damaged air filter or a malfunctioning mass airflow sensor can restrict airflow, leading to reduced engine performance and efficiency.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2007 Subaru Forester engine is stalling?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Any time there is an emissions fault the check engine light will be displayed. The purpose of the check engine light is to inform the driver that an emission related fault has been found, and that there are on-board diagnostic (OBD) trouble codes stored in the powertrain or engine control module. Additionally, since the emissions systems are so intertwined into engine control and transmission control systems, symptoms may include nearly any sort of drivability concerns. This may include harsh shifting, failure to shift, hesitation on acceleration, jerking, engine failure to start or run, loss of power, or any number of other drivability issues.

When the Check Engine Light comes on, you may experience engine performance issues such as poor acceleration, rough idling, or an engine that won't start. In some cases, no abnormal symptoms will be experienced. Other systems like the transmission or ABS can cause the Check Engine Light to illuminate and lights for those systems can come on at the same time. Similar lights may say "Check Engine Soon", "Malfunction Indicator Light" or just "Check". In rare case the engine can overheat.

What are the initial diagnostic steps to take when a 2007 Subaru Forester's engine is stalling?

When faced with a stalling engine in your 2007 Subaru Forester, it's essential to adopt a systematic diagnostic approach to identify the root cause effectively. Start by utilizing an OBD-II scanner to check for any trouble codes, as these codes can pinpoint specific issues related to critical components like the mass air flow sensor or oxygen sensors. Once you have this information, inspect the mass air flow sensor for cleanliness and functionality, as a malfunctioning sensor can lead to rough idling. Next, examine the oxygen sensors, particularly those located before and after the catalytic converter, since faulty sensors can disrupt the fuel mixture and contribute to stalling. Additionally, look for vacuum leaks around the intake manifold and throttle body, as these can cause erratic engine behavior.

Moving on, assess the ignition system by checking the condition of the spark plugs and wires, replacing any worn components to prevent misfires. If your vehicle is equipped with an ignition coil, inspect it for signs of failure as well. It’s also wise to evaluate the engine mounts and neutral switch, as issues here can lead to excessive engine movement and stalling during gear shifts. For a more in-depth analysis, perform a compression test to rule out internal engine problems, and check for exhaust leaks that could cause the engine to run lean. Finally, ensure that your coolant and oil levels are adequate and free from leaks, as these fluids are vital for optimal engine performance. If the stalling persists, consider performing an idle relearn procedure by disconnecting the battery to reset the system, allowing the ECU to recalibrate the idle settings. By following these steps, you can effectively diagnose and address the stalling issue in your Subaru Forester, empowering you to tackle the problem with confidence.

What are the common problems that could cause a 2007 Subaru Forester engine to stall?

When dealing with engine stalling in a 2007 Subaru Forester, it's essential to consider several common problems that could be at play. One significant area to inspect is the vacuum and PCV system; a disconnected or improperly seated hose can introduce excess air, leading to rough idling and stalling. Additionally, the ignition system, particularly worn or fouled spark plugs, can cause misfires that result in engine stalling, making it crucial to check and replace these components if necessary. Another critical factor is the camshaft position sensor, which, if faulty, can disrupt engine timing and contribute to stalling issues. The idle air control valve also plays a vital role; if it malfunctions, it can cause the engine to idle roughly. Furthermore, misadjusted valve clearance or uneven compression can lead to idle problems, so performing a leak-down test may be beneficial. Oxygen sensors should not be overlooked either, as faulty sensors can lead to incorrect fuel mixture adjustments, causing the engine to stall. Lastly, inspecting for vacuum leaks is essential, as any loose hoses or broken components can significantly impact engine performance. By systematically addressing these areas, DIYers can effectively troubleshoot and resolve stalling issues in their Subaru Forester.

How urgent is it to address the stalling engine in a 2007 Subaru Forester?

Addressing the stalling engine in a 2007 Subaru Forester is of utmost urgency due to the serious safety risks it poses. Stalling at crucial moments, such as during stoplights or in heavy traffic, can lead to dangerous situations, increasing the likelihood of accidents. Beyond safety, neglecting this issue can result in further mechanical complications, as repeated stalling places undue stress on the engine and other vital components, potentially leading to more severe and costly repairs. The reliability of your vehicle is also at stake; a stalling engine can disrupt daily activities and leave you stranded, necessitating emergency assistance. Additionally, the diagnostic process can become more complex over time, making it harder to identify the root cause if the problem is allowed to persist. Economically, the costs associated with ongoing repairs, potential towing, and the risk of being stranded can accumulate quickly. Therefore, it is essential to prioritize the resolution of this stalling issue to ensure safety, prevent further damage, and maintain the vehicle's reliability.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.

2007 Subaru Forester Engine Stalling: Causes & Repairs