In this F-Body and Third Generation World I was amazed at how much "lingo"
and "shop talk" it is presumed you know. Which I didn't. Below are common abbreviations for parts, conditions,
systems, and shop talk for club and member boards.
AFPR ~ Adjustable
Fuel Pressure Regulator
BTDC ~ Before Top
CFM ~ Cubic Feet Per
CPU ~ Central Processing
ECM ~ Electronic Control
EFI ~ Electronic Fuel
ET ~ Elapsed Time
GPH ~ Gallons Per Hour
HP ~ Horsepower
IAC ~ Idle Air Control
~ Mass Air Flow
MAP ~ Manifold Absolute Pressure
MAT ~ Manifold Air
MPI ~ Multi Port Injection
O2 ~ EGO ~ Exhaust Gas Oxygen
PROM ~ Programmable
Read Only Memory
PSI ~ Pounds Per Square
RPM ~ Revolutions
SCFM ~ Standard Cubic
Feet Per Minute
~ Speed Density
TBI ~ Throttle Body Injection
TPI ~ Tuned Port Injection
TSB ~ Technical Service
WOT ~ Wide Open Throttle
VE ~ Volumetric Efficiency
Internet Chat and Board Talk
IMHO ~ In My Humble Opinion
IMO ~ In My Opinion
LOL ~ Laugh Out Loud
LMAO ~ Laughing My
Back to Top ~ On a
chat board, to send message to top of post and keep it alive.
BRB ~ Be Right Back
~ Used in live chat to take a break.
FWIW ~ For What It's
BTW ~ By the Way
SOTP ~ Seat of the
Pants ~ To describe the intensity of mod results.
J/K ~ Joke
AFAIK ~ As Far As
OMG ~ Oh My God
Open Loop Operation ~ Is the mode in which the system is being controlled by components other than the O2 Sensor,
for example at engine warm up and wide open throttle.
Closed Loop Operation ~ Is the mode in which the system is being controlled by the O2 sensor, after O2 warm-up
which is app. 600°F. This is effective at partial throttle and idle, and is the mode that enhances driveability
and fuel economy.
~ In this mode the ECM declares emergency and changes timing and fuel enrichment to get you home or to a service
point for repairs. Improper setup, failed sensors, and trouble codes will send the car into the limp home mode
which is in actuality not a very drivable mode.
~ Mass Air Flow ~ As used by GM is a sensor used to determine the amount of incoming airflow and this calibration
is used to meter fuel to provide proper air/fuel ration. This is accomplished by the use of a heated wire measuring
how much air is required to cool to a certain degree. This creates a resistance that is measured and interpreted
by the ECM. The MAF system is limited in the amount of CFM it can flow but is extremely tolerable to bolt on modifications.
~ Speed Density ~ As a means of reducing cost GM incorporated the Speed Density system in 1990. Using the MAP (Manifold
Absolute Pressure) Sensor to sense pressure changes in the intake fuel is added or subtracted accordingly. The
SD system is not restricted by CFM ratios and responds to RPM variations quicker, but is more sensitive to engine
modifications made. Calibrations have to be reprogrammed with each new mod.