9000 L4-1985cc 2.0L DOHC Turbo EFI (1987)
Air Flow Meter/Sensor: Description and Operation
Mass Air Flow Sensors
General
There are three types of mass air flow sensor. They are not interchangeable.
Mass air flow meters in both aluminium and plastic versions with a CO adjusting screw occur in the LH 2.2 system.
Only mass air flow meters of plastic without a CO adjusting screw occur in the LH 2.4, 2.4.1 and 2.4.2 (cars with catalytic converter) systems.
The LH 2.4.2 system (cars without a catalytic converter) features a mass air flow meter of plastic with a CO adjusting screw.
Important
A mass air flow meter of plastic must never be replaced by a mass air flow sensor of aluminium or vice versa. If this is done the LH system will be
rendered unserviceable.
