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Home >> Pontiac >> 1981 >> T1000 2D Hatchback, Automatic Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> Tune-Up >> Tune-Up - 4 CYL >> Idle Speed >> Slow & Fast Idle Adjustment (2.5L Only) >> Idle Speed (With Solenoid)

Idle Speed (With Solenoid)

  1. Warm engine to normal operating temperature and adjust timing. With A/C off, turn idle speed screw to adjust curb idle.
  2. Disconnect compressor clutch wire and turn A/C on. Open throttle slightly to allow plunger to extend. Turn solenoid plunger to obtain correct solenoid RPM. Reconnect compressor clutch wire.
  3. Disconnect EGR valve vacuum line at carburetor and plug carburetor port. Place adjustment screw on high step of fast idle cam and adjust fast idle RPM. Remove test equipment and reconnect all hoses.
Fast Idle Speed (RPM)

Application RPM
1.6L 2.5L
2500 2600
Idle Speed (RPM)

Application Curb Idle Solenoid Energized
1.6L
  Man. Trans (1)800 1150
  Auto. Trans 700 1400
2.5L
  Man. Trans.
    With A/C (2) (2)
    Without A/C 800 1000
  Auto. Trans.
    With A/C (2) (2)
    Without A/C 550 675
(1) Set to 700 RPM on decal code AUN.
(2) Idle speed controlled by ISC. See Idle Speed Control adjustment  procedures.