Wagoneer L6-258 4.2L VIN C 2-bbl (1982)
Air/Fuel Mixture: Adjustments
Idle Speed Drop Chart
NOTE: Apply parking brake and do not accelerate engine. Place manual transmission in neutral; automatic in drive.
1. Start engine and allow to reach normal operating temperature, then turn engine off.
2. Turn each mixture screw to its full rich position. Note position of screw head slot inside limiter cap.
3. Carefully remove each limiter cap by installing a sheet metal screw in center of cap and turning clockwise. A soldering gun may also be used to cut
through plastic caps.
4. Reset idle mixture screw(s) to approximate position noted before removing the limiter cap(s).
5. Connect tachometer and start engine.
CAUTION: Apply parking brake and block drive wheels. Place manual transmission in neutral; automatic in drive.
6. Adjust curb idle speed to specifications while noting the following steps:
a. On 1972 models, if equipped with Air Guard System, stop engine and disconnect by-pass valve air inlet hose.
b. On 1972 models and 1978-82 models, adjust curb idle speed to specifications.
c. On 1973-77 models, adjust curb idle speed 30 rpm higher than specifications.
7. With each mixture screw at its full rich position as established in step 4, turn each screw evenly towards the leaner position (clockwise) until a
definite loss of rpm is noted.
8. Turn each mixture screw evenly in the richer direction (counterclockwise) until the highest rpm is obtained. Do not turn screws any further than
point at which highest rpm is noted. This is the lean best idle position.
