Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
THERMACTOR System: Description
The Thermactor Exhaust Emission Control system reduces the carbon monoxide (CO) and the hydrocarbon (HC) content of exhaust gases. It injects fresh air into the exhaust gas stream, as it leaves the combustion chamber, in order to continue the combustion of unburned gases. A typical system consists of the following components: Air supply pump, air by-pass valve, centrifugal filter, check valve(s), air control valve, air manifold and air hoses.
Individual systems vary in the number and type of components, depending upon engine size and application. The Managed Thermactor Air (MTA) system uses the same basic components as the standard system, but "manages" thermactor air according to operating conditions. Some models are equipped with the Thermactor II system which uses a Pulse Air Valve (PAV) instead of an Air Pump. Another system, the Extended Idle Air By-Pass system, is used to release secondary thermactor air to the atmosphere.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.