Section 4.11
Restrictive Air Filter

To determine if a restrictive air filter is causing starting difficulty, perform the following steps:‪

1. Remove the air filter element; refer to OEM guidelines.
2. Attempt to start and run the engine.
   1. If the engine starts and runs, no further troubleshooting is required. Shut down the engine.
   2. If the engine fails to start and run, refer to "4.11.1 Air Filter Replacement" .

Section 4.11.1
Air Filter Replacement

Perform the following steps for air filter replacement:‪

1. Visually inspect the air filter for clogging and replace as necessary; refer to OEM guidelines.
2. Visually inspect gaskets for deterioration and replace as necessary; refer to OEM guidelines.
3. Visually inspect air inlets for restrictions and clean as necessary; refer to OEM guidelines.
4. Verify air filter replacement; refer to "4.11.1.1 Test Engine with Replaced Air Filter" .

Section 4.11.1.1
Test Engine with Replaced Air Filter

Refer to "4.11 Restrictive Air Filter" for the exhaust before proceeding. Perform the following steps to determine if the replaced air filter resolved starting difficulty:‪

1. Attempt to start and run the engine. If the engine starts and runs, no further troubleshooting is required. Shut down the engine.
2. If the engine fails to start and run, check compression; refer to "4.12 Low Compression" .