Thermostatic Air Cleaner: Testing and Inspection

Results of Incorrect Operation

Hesitation during warm up can be caused by:
- Heat stove tube disconnected.
- Missing or damaged air cleaner to TBI gasket.
- Loose air cleaner cover and air cleaner.
- Missing air cleaner cover seal.
- Stuck open damper door.

Lack of power, sluggish, pinging or spongy, on a hot engine check for:
- Stuck closed damper door.

Air Cleaner Functional Check
- Remove air cleaner assembly and cool to below 4°C (40°F). The damper should be closed to outside air (cold air).
- Check condition of air cleaner to throttle body gasket.
- Reinstall air cleaner and connect heat stove tube at air cleaner snorkel and exhaust manifold.
- Start engine. Watch damper door in air cleaner snorkel. As air cleaner warms up, damper door should open slowly to outside air (cold air).
- If air cleaner fails to operate as described, be sure calibrated spring is properly installed and damper door is not binding.
- If still inoperative after last step, replace wax pellet actuator assembly and recheck