Mk1Vw - Tutorials

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Common Acronyms

Definitions

AFM - An airflow meter. Reports the quantity of air entering the engine to the ECU.

ATDC - After Top Dead Center. See TDC for more information..

BTDC - Before Top Dead Center. See TDC for more information..

CIS - Continuous injection fueling system. Fuel injectors run in continuous cycle whilst engine is running.

CTS - Coolant temperature sensor. Blue plug on water pipe on front of cylinder head.

Digi - Digifant Electronic fuel injection system as used on later Cabriolets, mk2 8v Golfs, Jettas, etc.

Digi1 - Two varieties of Digifant referred to as 'digi'. First, California-only emissions-tight digifant version. Second, digi1 as used in G60 engines.

Digi2 - Later released digifant system utilizing VAM, most Digifants are digi2. The two are easily discernible by examining plug on the fuel injector rail. Digi1 has 5 wires, Digi2 has 2 wires.

DOHC - Dual Over Head Cams. This refers to a motor with 2 cams, located in the head, rather than the SOHC motor, which has only one.

ECU - Electronic Control Unit. Manages electronic fuel injections etc. Metal box with heatsink, usually under left hand corner of rain tray cover in engine bay.

EFI - Electronically controlled fuel injections system. As used on digifant.

ICM - Ignition control module. Sits on top of ECU and controls ignition.

ICU - Ignition control unit, as above.

ISV - Idle Stabilization Valve. Electronically controlled valve used to stabilize idle under ancillary load. Cylindrical object on top of rocker cover with one plug and two hoses connected to it.

ITBs - Individual throttle bodies. A throttle body for each cylinder, as opposed to the single throttle body attached to a common intake plenum used on most EFI setups.

MFI - Mechanically controlled fuel injection. As used on post-carb, pre-digifant 8v engines.

O2 - Oxygen sensor in exhaust system that helps report lean/rich condition of engine to ECU.

OEM - Original Equipment Manufacturer. OEM items are items that came "stock" from VW.

TDC - Top Dead Center refers to the position of the motor when the number one piston is at the top of its rotation. ATDC stands for After Top Dead Center and BTDC is Before Top Dead Center.

VAM - Vane air meter. A type of AFM that utilizes a flap spring-loaded against engine load to report air intake quantity.

VDO - A German gauge company. Translated, it means United German Tachometer Company. Literally, VDO stands for Vereinigte (United) DEUTA (Duetsche Tachometerwerke GmbH or German Tachometer Limited) OTA (originated from the merger of OTA Apparate GmbH with a division of DEUTA in 1929).

Contributed By: Lucky on Friday, May 02

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