FIAT 124 Spider
Engine Maintenance + Modification
49
Figure 37: Idle speed controls on the Spider 2000
Lock the accelerator stop screw with the retaining nut. Use the idle speed screw (1) to
set idle at 850 to 900 RPM on manual transmissions and 700 to 800 RPM on automatic
transmissions. If idle speed cannot be reached using this procedure, fully remove the
idle speed screw (2) and clean the orifice and the screw itself using a high pressure
spray cleaner (carburetor cleaner is fine).
5.10.3 Throttle Position Sensor Adjustment
The throttle position sensor tells the ECU to turn off the injectors during deceleration.
Improperly set it can affect the travel of the throttle plates and cause poor transition from
full speed to cruise and idle operation.
Unplug the throttle plate switch. Note the connector blades (on the plate switch, not the
connector itself) are marked “3” “18” and ‘2”. Connect an ohmmeter between
terminals 2 and 18 of the switch. Loosen the two screws holding the switch in place.
Rotate the switch clockwise until the ohmmeter indicates a closed circuit. Tighten the
two screws and reconnect the switch.
To Next Page