Second Generation Camaro Owners Group - Camaro Emission System Information & Restoration

The emission system is designed to reduce tailpipe exhaust emissions. All Camaros had some form of "smog equipment". Some had more than other models for the year. As the years went by the Camaro got more systems added.

Jump to: Restoration | Emission Labels

AIR tubes, check valve & pump (under alternator) Holy Cow - what a freekin mess

Emission hose routing (1979):
250 1bbl (FED) | 250 1bbl (CA) | 267 2bbl (FED) | 305 2bbl (FED) | 305 2bbl (CA)
305 4bbl (FED) | 305 4bbl (CA) | 305 4bbl (HI-ALT) | 350 2bbl (CA) | 350 4bbl (FED) | 350 4bbl (CA) | 350 4bbl (HI-ALT)

Emission System General Information

Positive Crankcase Ventilation (PCV) - uses manifold vacuum to draw off engine crankcase vapors through a metered PCV valve and ultimately to the intake system for engine reburn.

Transmission Controlled Spark (TCS) - Retards engine spark advance by eliminating vacuum advance in all forward gears except High Gear.

Air Injection Reactor (AIR) - Air pump injects air into exhaust manifold which burns unburned portion of exhaust fumes.

View: Z28, Air Cleaner, Vacuum & AIR hoses (1970) | Diverter valve, AIR pipes | AIR pump, pulley & fan

Controlled Combustion System (CCS) - Increases combustion efficiency through leaner carburetor adjustments and revises distributor calibration. Special thermostatically controlled damper in the air cleaner snorkle maintains warm air intake to carburetor.

Exhaust Gas Recirculation (EGR) - Meters exhaust gas into the induction system for recirculation throughout the combustion cycle to reduce oxides of nitrogen.

Carburetor Hot Air - Meters and mixes heated air with incoming cold air to optimize fuel evaporation.

Early Fuel Evaporation (EFE) - System is designed to produce a very short engine warm up cycle to improve vehicle drivability and reduce exhaust emissions.

Fuel Evaporation Control System - Controls emission of gasoline vapors to the atmosphere by means of an integral separator with the fuel tank that separates vapor from liquid fuel - a filler cap that doesn't permit venting, a canister for storage of vapors, lines hoses and valves to control and transport vapors from the fuel tank to storage and finally to the carburetor for burning in the running engine.

View: Fuel Tank w/EEC (1970) | Hose Routing - L78 w/NA9 | Hose Routing - Z28 w/NA9

Catalytic Converter - The flow of exhaust gases down through the catalyst within the converter effectively controls the hydrocarbon and carbon monoxide emissions.

Monolith Manifold Converter - The flow of exhaust gases down through the catalyst within the converter effectively controls the hydrocarbon and carbon monoxide emissions. (typically used on 6 cylinder models).

Emission System Restoration
A couple things on this topic. Emissions or smog equipment is blamed for killing power in the Camaro (and all cars) throughout the 70's. To some degree this is true. It's also complex and confusing to some people, so they'd rather get rid of it. The major reason why cars lost power and performance is because compression ratios were reduced, your camshaft isn't designed for power, your car got heavier and your rear axle ratio got higher.

I believe a car can run clean, and make power. Look at the L78 engine.

Before you hap-hazardly rip out all your emissions equipment to "get more power", it would be beneficial to understand what these systems are doing. How much power is your charcoal canister sapping? Not much. The fact it has a weak cam in it might be why your car runs like crap.

I'll write more about this when I get a chance but for now, the above should be enough to get you thinking.


Last updated: 10/20/2011
Author: MadMike Maciolek

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