Combustion Engine Producing Insufficent Torque

Common symptoms

What you'll notice

• Check the air filter and clean or replace if necessary.
• Inspect and clean the throttle body to ensure it is not clogged.
• Verify that the fuel system is delivering enough fuel and check for any clogged or dirty fuel injectors.
• Inspect the spark plugs and replace if worn or faulty.
• Perform a compression test to check for any issues with the engine's compression.

Common causes

Most likely first

1. Spark plug malfunction
2. Fuel injection system issue
3. Ignition coil failure
4. Air filter clogging
5. Exhaust system blockage

How to diagnose & fix

Work through it in order

1. Loss of power and acceleration
2. Engine misfires or stutters
3. Poor fuel economy
4. Engine hesitation or stumbling
5. Difficulty starting the engine