Q:
What does this term mean? (Monte Carlo SS Glossary)
Aerocoupe
A.I.R. - Air Injection Reaction System (In a nutshell, the smog pump injects air into the exhaust manifold and catalytic converter to reduce emissions.)
ALCL - Assembly Line Communications Link
A Pillar - The two pillars that hold the windshield
APT - Adjustable Part Throttle
ATDC - After Top Dead Center, referring to timing. Refer to TDC.
BARO - Barometric Absolute Pressure Sensor - Measures Barometric pressure. Provides the ECM with altitude information.
BHP - Brake Horsepower
BTDC - Before Top Dead Center, referring to timing. Refer to TDC.
B Pillar - The two pillars right behind the doors, in front of the 1/4 glass windows.
C Pillar - The two pillars behind the 1/4 windows, in front of the rear window.
C.A.R.B. - California Air Resource Board. The State of California governing body that regulates emissions in California.
C.A.R.B. assigns numbers to aftermarket products that have been validated not to cause increased emissions. For a product
to earn a C.A.R.B. number, the manufacturer must perform tests with the product in specific vehicles or engine types.
Since California has the harshest emissions laws in the country, a product with a C.A.R.B. number is deemed 50 state legal
for use in the specific application the C.A.R.B. number was assigned.
CCC - Computer Command Control
CCV - Canister Control Valve - located in front of the carburetor.
CID - Cubic Inch Displacement, as in 305 CID engine.
Close Loop - Mode of ECM operation where it is controlling fuel delivery and spark advancement while monitoring exhaust gasses via the O2 sensor. Close loop only occurs only after warm-up and at idle/part throttle (not at WOT).
COWL - Location at the base of the windshield. Basically, where the windshield wipers park.
DIS.LACQUER - Dispersion Lacquer. Listed on the SPIL, indicates the type of paint used.
E4ME - The model number of the CCC QuadraJet (Q-Jet) Carburetor used on the 4th Gen SS.
ECM - Electronic Control Module
EDES - Electronic Divert and Electric Switching Valve
EECS - Evaporative Emissions Control System - Charcole canister and canister control solenoid
EFE - Early Fuel Evaporation
EGR - Exhaust Gas Recirculation
ESC - Electronic Spark Control
EST - Electronic Spark Timing
F41 - RPO code for the sport suspension on the SS
G80 - RPO code for the limited slip differential option on the SS
HEI - High Energy Ignition
HO - High Output
ISC - Idle Speed Control
ISS - Idle Stop Solenoid
L69 - RPO designation for the high output 305ci engine.
LG4 - RPO designation for the standard output 305ci engine.
Limited Slip - GM's term for a rear differential that will supply power to both rear wheels in slippery conditions (used to be called Posi)
MAP - Manifold Absolute Pressure Sensor - Measures changes in the intake manifold pressure which result from engine load and speed changes, and converts this to a voltage output.
M/C - Mixture Control
MCS - Mixture Control Solenoid, located inside the Q-Jet Carburetor. That's the clicking noise you hear when you turn the ignition on, without starting the engine.
Notchback
O2 - Oxygen Sensor - Mounted in the exhaust system where it monitors the oxygen content of the exhaust gas stream.
Open Loop - Mode of ECM operation, where the ECM is not controlling fuel delivery and spark advance. The system will be in open loop if the O2 sensor is below 600 degrees F or at WOT.
PCV - Positive Crankcase Ventilation
POSI - Old GM term that specifies a rear differential that will supply power to both wheels in slippery conditions (now called Limited Slip)
RPO - Regular Production Option, a list of these can be found on the Service Parts Identification Label on the inside of the trunk lid.
