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 Systems: Description
The Thermactor Exhaust Emission Control System reduces carbon monoxide (CO) and hydrocarbon (HC) content of exhaust gases. It injects fresh air into the exhaust gas stream as it leaves the combustion chamber, allowing continued combustion of unburned gases. A typical system consists of the following components: Air supply pump with centrifugal filter, air bypass valve, check valve(s), air manifold and air hoses. Individual systems vary in number and type of components dependent upon engine size and application.
The Managed Thermactor Air (MTA) System uses the same basic components but "manages" thermactor air according to operating conditions. Air is bypassed to atmosphere by a Thermactor Air Bypass (TAB) valve, directed upstream near the exhaust manifold or downstream to the underbody catalytic converter by the Thermactor Air Diverter (TAD) valve.
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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.
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