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NA9 - Evaporative Emission Control
Smog
Specifications

TCS - Transmission Controller Spark

 

 

DESCRIPTION 1

 

The 1970 system consists of a transmission switch, solenoid vacuum switch, time delay relay, and a thermostatic water temperature switch. The solenoid vacuum switch is de-energized in the lower gears via the transmission switch and closes off distributor vacuum. The two-way transmission switch is activated by the shifter shaft on manual transmissions, and by fluid pressure on automatic transmissions. The switch energizes the solenoid in High gear, the plunger extends and uncovers the vacuum port, and the distributor receives full vacuum. The temperature switch overrides the system until the engine temperature reaches 82*F. This allows vacuum advance in all gears, thereby preventing stalling after starting. A time delay relay opens fifteen seconds after the ignition is switched on. Full vacuum advance during this delay eliminates the possibility of stalling.

 

DESCRIPTION 2

 

Introduced in 1970, this system controls exhaust emissions by eliminating vacuum advance in the lower forward gears.The 1970 system consists of a transmission switch, solenoid

vacuum switch, time delay relay, and a thermostatic water temperature switch. The solenoid vacuum switch is de-energized in the lower gears via the transmission switch and closes off distributor vacuum. The two-way transmission switch is activated by the shifter shaft on manual transmissions, and by fluid pressure on automatic transmissions. The switch energizes the solenoid in High gear, the plunger extends and uncovers the vacuum port, and the distributor receives full vacuum. The temperature switch overrides the system until the engine temperature reaches 82F. This allows vacuum advance in all gears, thereby preventing stalling after starting. A time delay relay opens fifteen seconds after the ignition is switched on. Full vacuum advance during this delay eliminates the possibility of stalling.

 

The 1971 system is similar, except that the vacuum solenoid (called a Combination Emissions Control solenoid) serves two functions. One function is to control distributor vacuum; the added function is to act as a deceleration throttle stop in High gear. This cuts down on emissions when the vehicle is coming to a stop in High gear. Two throttle settings are necessary; one for curb idle and one for emission control on coast.

 

The 1972 six cylinder system is similar to that used in 1971, except that an idle stop solenoid was added to the system and the name was changed back to TCS. In the energized position, the solenoid maintains engine speed at a predetermined fast idle. When de-energized the solenoid allows the throttle plates to close beyond the normal idle position; thus cutting off the air supply and preventing engine run-on. The six cylinder is the only 1972 engine with a CEC valve, which serves the same deceleration function as in 1971. The time delay relay delays full vacuum twenty seconds after the transmission is shifted into High gear. 1972 V8 engines use a vacuum advance solenoid similar to that used in 1970. The solenoid controls distributor vacuum advance and performs no throttle positioning function. The idle stop solenoid used on V8s operates in the same manner as the one on six cylinder engines. Air conditioned trucks have an additional anti-diesel (run-on) solenoid which engages the compressor clutch for three seconds after the ignition is switched off.

 

The 1973 TCS system on the six cylinder engine is identical to that on the 1972 six, except for recalibration of the temperature switch. The system used on 1973 V8 engines changed slightly from 1972. In place of the CEC solenoid on the six, the V8 continues to use a vacuum advance solenoid. The other differences are: the upshift delay relay, previously located under the instrument panel had been done away with; a 20 second time delay relay identical to the one on six cylinder engines is used; V8s use manifold vacuum with TCS and ported (above the throttle plates) vacuum without TCS.

 

The six cylinder TCS system was revised for 1974-75 by replacing the CEC solenoid with a vacuum advance solenoid. Otherwise the system remains the same as 1973.

 

 

 

 

My smog system is back on my car after I clean it up. See below.

 

If I took more care these tubes would have been reusable today.

 

 

Rear - 7801149   310   D23

 

 

Date code 12001S

120=120th day

0=1970

1=1st shift

S=Saginaw Plant

 

Diverter valve

 

2 gaskets are required on the pump, one on the diverter elbow to the body

and the other on the diverter to the elbow.

 

   

Check valve 1969-74 part # 5371992

 

Original tower clamp

 

 

Side by side new and old (the curved pipe on the right was only available for 73-74 cars part # 330508.)

The curved passenger pipe is for sale $150.00 OBO + shipping.

The drivers side is part # 343763. It has a flat spot for some reason.

 

Repo Smog Tubes

 

Repo Smog Tubes from Early Birds Toronto which come from http://www.drclassic.com/catalog/Camaro/Exhaust/Z00052.html

 

 

TCS Switch on the intake

 

stamped part  no.  DR1114432

                                                                                                        

 

If the packard 56 male connector body  is not available from GM then you can get it here http://terminalsupplyco.com/Store/Product.aspx?pc=2977647

If you need the terminal and GM no longer has any then get it here http://terminalsupplyco.com/Store/Default.aspx?CAT=DEL010030&PCAT=53133#Categories

 

 

Smog Vacuum Hoses

 

 

 

Temp Switch on Pass Side

 

Connector

Terminal cover Link

Terminal link

 

 

Time Delay Relay

 

 

 

Trans Switch (4-spd) Auto trans will have a fluid pressure switch.

 

 

 

 

 

 

 

 

 

Complete Smog Unit

 

 

 

Smog pump pulley - 3932458DA

 

 

Diverter Valve

 

    

 

 

 

 

For Sale:

 

GF Diverter Valve Sticker

 

 

1.50 ea or 6 for 8.00 (all US funds)

Shipping/Handling: 1.00 to USA and .57 in Canada.

 

 

Diverter Valve Elbow

 

 

 

Upper Bracket

 

Smog Pump upper mounting Bracket. Mounts to the alternator mounting bolt and the 2 bolt holes on the water pump.

 

 

Lower Bracket

 

Smog Pump lower mounting bracket. mounts to the block to the right of the fuel pump.

Remember to apply thread sealer (Permatex 2) to the top hole here or you will have an oil leak.

 

 

Smog pump installed with upper

bracket that attaches to the water pump

 

Smog pump and alternator

 

Exhaust manifold pipes installed before the black smog tubes.

 

Length of tube - Measured with the wide end on a flat surface

with a metal straight edge it comes to 68mm or 2-11/16.

 

Smog System Installed and Completed