View Full Version : EFI Acronyms and Abbreviations

05-28-2011, 05:09 PM
EFI Acronyms and Abbreviations
#/Hr - Pounds per Hour or PPH
ABS - Anti-lock Braking System
A/C - Air Conditioning
AE - Acceleration Enrichment
AFPR - Adjustable Fuel Pressure Regulator
AFR - Air Fuel Ratio
ATDC - After Top Dead Center
ALDL - Assembly Line Diagnostic Link
BARO - Barometric Pressure
BBL - Barrel
BCM - Body Control Module
BDC - Bottom Dead Center
BIN - Binary
BLM - Block Learn Multiplier
BSFC - Brake Specific Fuel Consumption
BPC - Base Pulse Constant
BPW - Base Pulse Width
BTDC - Before Top Dead Center
CAT - Catalytic Converter
CCI - Computer Controlled Ignition
CCP - Charcoal Cannister Purge
CDI - Capacitive Discharge Ignition
CEL - Check Engine Light
CFI - Cross-Fire Injection
CLT - Closed Loop Term
CNP - Coil Near Plug
CTS - Coolant Temperature Sensor
DC - Duty Cycle
DE - Deceleration Enleanment
DFCO - Decel Fuel Cut Off
DIS - Distributorless Ignition System
DRP - Distributor Reference Pulse

EAC Valve An abbreviation for Electric air control valve. This is the GM version of a diverter air gulp valve, providing three functions in a single valve
•the normal diverter valve function, i.e., it diverts air on rapid increase in manifold vacuum;
•it relieves pressure by diverting air to the air cleaner when the air injection system pressure exceeds a certain set level;
•being solenoid-controlled, it allows air to be diverted under any desired operating mode.

ECM - Engine Control Module
ECT - Engine Coolant Temperature
EGR - Exhaust Gas Recirculation
EGT - Exhaust Gas Temperature
EPROM - Eraseable Programmable Read-only Memory
ESC - Electronic Spark Control, knock detection & retard
EST - Electronic Spark Timing, SA control
FAR - Fuel Air Ratio
FPR - Fuel Pressure Regulator
Ft/Lb - Foot Pounds
GPS - Grams Per Second
Gms/Sec - Grams per Second
HEI - High Energy Ignition
HP - Horse Power
IAC - Idle Air Control
IAT - Intake Air Temperature
INT - Integrator
Km - KiloMeters
Km/L - Kilometers per Litre
KPa - KiloPascals
KPH - Kilometers Per Hour
LM - Launch Mode
LSA - Lobe Separation Angle
MAF - Mass Air Flow
MAP - Manifold Absolute Pressure
MAT - Manifold Air Temperature
MPG - Miles Per Gallon
MPH - Miles Per Hour
MPFI - Multi Port Fuel Injection
NB - Narrow Band O2 sensor
O2 - Oxygen Sensor
P/S - Power Steering
PCM - Powertrain Control Module
PCV - Positive Crankcase Ventilation
PE - Power Enrichment
PPH - Pounds Per Hour
PROM - Programmable Read-only Memory
PSI - Pounds per Square Inch
PW - Pulse Width
PWM - Pulse Width Modulation
RPM - Revolutions Per Minute
SA - Spark Advance
SD - Speed Density
SES - Service Engine Soon
TACH - Tachometer
TBI - Throttle Body Injection
TCC - Torque Converter Clutch
TCM - Transmission Control Module
TDC - Top Dead Center
TF - Throttle Follower
TPS - Throttle Position Sensor
TSA - total spark advance
VAC - Vacuum
VAFPR - Vacuum Adjusted Fuel Pressure Regulator
VATS - Vehicle Anti-theft System
VE - Volumetric Efficiency
VRFPR - Vacuum Referenced Fuel Pressure Regulator
VSS - Vehicle Speed Sensor
WB - Wide Band O2 sensor
WOT - Wide Open Throttle

06-04-2011, 08:28 AM
This is great for a newb like me. Thanks!

06-05-2011, 10:22 AM
There's a lot more when you get into OBDII stuff. This is all I knew off top of my head...

06-06-2011, 08:33 AM
Thank you sir. I was contemplating making my own list to keep all of these straight.

07-29-2011, 05:01 PM
If anyone knows one not listed just post them up and I will edit the list.

Lots of this stuff that is coming together here in the forums I will turn into HTML pages for future reference and the search engines find HTML pages easier than php or cgi or any kind of forum type data base driven information.

We have all summer though... I spend more time inside doing these projects in winter! Gives me something to do while staying warm!

05-05-2014, 07:53 PM
Thanks for this great information.. Love this Site!!!