1994 PCED OBDI-A
SECTION 20A: Diesel Diagnosis—7.3L IDI Engine
Idle Speed Setting Procedures
 
Low Curb Idle Speed Adjustment
  1. Place transmission in NEUTRAL or PARK.
  1. Bring engine up to normal operating temperature.
  1. Idle speed is measured with manual transmission in NEUTRAL and automatic transmission in DRIVE.
  1. Make sure that low idle adjusting screw is against the stop. If not, correct vehicle linkage.
  1. Check low idle speed, using Rotunda 055-00108 or equivalent. Low idle speed is specified on the Vehicle Emissions Control Information (VECI) decal. Adjust to specification using idle speed adjusting screw (Figure 11).
  1. Place transmission in NEUTRAL or PARK. Rev engine momentarily. Place transmission in specified gear and check low idle rpm. Adjust again if necessary.
 



Figure 11: Idle Speed Adjusting Screw
 
Fast Idle Adjustment

At Cold Idle Solenoid:

  1. Place transmission in NEUTRAL or PARK.
  1. Start engine and bring up to normal operating temperature.
  1. Disconnect fast idle solenoid from wiring harness.
  1. Apply battery voltage to solenoid to activate it.
  1. Rev engine momentarily to set solenoid to activate it.
  1. Check fast idle speed setting. Fast idle rpm should be 825 ± 25. Adjust to specification by turning solenoid plunger in or out (Figure 11).
  1. Rev engine momentarily and check fast idle rpm. Adjust as necessary.
  1. Remove battery voltage from solenoid connector and connect to wiring harness.