Idle Load COMPENSATOR (ILC)
NOTE:
Not all models are equipped with an ILC.
- With transmission in "P", brakes set and wheels blocked, prepare vehicle for adjustments. Remove air cleaner and plug hose to thermal vacuum valve (TVV). Disconnect and plug hoses to EGR, canister purge port and idle load compensator (ILC).
- Back out idle stop screw 3 turns. Verify A/C is "OFF". With engine running and transmission selector in "D", check that ILC plunger is fully extended. Adjust plunger to obtain 725 RPM. Hold jam nut on plunger to avoid damaging ILC.
- Remove plug from vacuum hose, reconnect hose to ILC. Idle speed should be 500 RPM in "D". If speed is correct, no further adjustment is necessary. If speed is NOT correct, proceed to next step.
- Stop engine and remove the ILC. Plug vacuum hose to ILC. With the ILC hose removed, remove the rubber cap from the center outlet tube. Remove the metal plug (if used) from this same tube.
- Install ILC and all related parts on carburetor. Remove plug from vacuum hose and reconnect hose to ILC. Using a spare rubber cap with a hole punched to accept a .090" (3/32") Allen wrench, install cap on center outlet tube.
- Start engine and turn adjusting screw to obtain 500 RPM in "D". Remove wrench and cap and install new rubber cap. With engine running and transmission in "D", measure distance from the jam nut to the tip of plunger.
- This distance must not exceed 1" (25 mm). See Fig 1 .
- Disconnect and plug vacuum hose to ILC. Apply vacuum source to ILC inlet tube to fully retract plunger. Adjust idle stop screw on carburetor float bowl to obtain 500 RPM in "D".
- Stop engine. Reconnect all hoses and remove test equipment.
IDLE SPEED
| Application | Curb Idle | Solenoid Energized |
|---|---|---|
| 5.7L Calif./Light Duty, A/T | 550 | 600 |