SSP 121 – MPI in the 20-valve naturally aspirated engine
INDEX
A high-performance engine variant in the Audi 90 and Audi Coupé range is the 2.3-liter engine with four-valve technology. This power unit is a further development of the 2.0-liter five-cylinder 20-valve engine.
The fully electronic engine management system MULTIPOINT INJECTION (MPI), in combination with a three-way catalytic converter and lambda control, ensures compliance with U.S. exhaust emission standards.
The new version of the 20-valve naturally aspirated engine described here (engine code 7A) can be identified at first glance by the modified idle air control valve and the cast exhaust manifold.
Contents
Part I – Important fundamentals
Power diagram
Major innovations
Overall overview
Engine components and connections
Fuel system
Ignition system
Idle air control
Fuel tank ventilation system
Crankcase ventilation
Exhaust gas recirculation (EGR)
Power supply
Self-diagnosis
Part II – Important details for troubleshooting
Part II begins on page 26 with a table of contents