Ford Festiva. Instruction - part 33
IDLE SPEED & MIXTURE
IDLE MIXTURE
IDLE SPEED
1. Turn off all accessories. Place automatic transmission in Park or instruction transmission in Neutral. Set parking brake. Connect tachometer
to engine. Warm engine to normal operating temperature. Connect a jumper wire between single-wire STI test connector (Green on
Capri; Black on Festiva) and ground. See
Fig. 1
.
2. Locate idle speed control by-pass air (ISC-BPA) valve on intake manifold. Remove cap, and adjust idle speed to specification by turning
idle air adjust screw on ISC-BPA valve. See
Fig. 2
. Remove jumper wire.
IDLE RPM
Fig. 2: Locating Idle Air Adjust Screw
Courtesy of FORD MOTOR CO.
THROTTLE POSITION SWITCH (TP)
CAPRI
Throttle position sensor is preset at factory. No adjustment is required.
FESTIVA
1. Ensure idle speed and ignition timing are adjusted to specification. Stop engine. Disconnect negative battery cable.
2. Unplug TP connector at throttle body. Insert appropriate feeler gauge between throttle stop screw and stop lever. Check for continuity
between specified terminals on TP connector. See TP ADJUSTMENT table.
3. To adjust, loosen TP attaching screws. Connect ohmmeter between terminals IDL and TL. See
Fig. 3
. Insert a .020" (.5 mm) feeler
gauge between throttle stop screw and stop lever.
4. Rotate TP until ohmmeter indicates continuity. Insert a .028" (.7 mm) thickness gauge between stop screw and stop lever. Ohmmeter
should indicate no continuity. If ohmmeter indicates continuity, repeat adjustment procedure.
Application
Auto. Trans.
Man. Trans.
1.3L
9-11 @ 850
9-11 @ 700
1.6L Non-Turbo
1-3 @ 850
0-4 @ 850
1.6L Turbo
10-14 @ 850
0-4 @ 850
NOTE:
Idle mixture is controlled by ECA and is not adjustable.
Application
Auto. Trans.
Man. Trans.
1.3L
830-870
680-720
1.6L
800-900
800-900
CAUTION:
DO NOT tamper with throttle stop screw at throttle lever. Doing so may result in damage to throttle
body.