S10/T10 Blazer 4WD V6-173 2.8L VIN B 2-bbl (1983)
Idle Mixture Needle Plug Removal
7. If enriched rpm is not within specifications, turn OFF propane flow and remove plugs sealing mixture screws.
NOTE: On models with limiter caps, remove limiter cap from each mixture screw, taking care not to damage screws.
8. Start engine and allow it to reach normal operating temperature.
9. Turn each mixture screw in (clockwise) until lightly seated, then back screws out equally, just enough so engine will run.
10. Place transmission in drive (manual transmission in neutral).
11. Turn mixture screws counter-clockwise equally, 1/8 of a turn at a time, until maximum idle rpm is obtained.
12. Adjust idle speed to specified enriched rpm following procedure in step 3.
13. Turn mixture screws clockwise equally, 1/8 of a turn at time, until specified curb idle speed is obtained.
14. Repeats step 5 then turn OFF propane flow. If enrich rpm is not within specifications, repeat step 10-14.
15. If equipped with a throttle stop solenoid:
a. Disconnect wiring harness connector to solenoid.
b. Adjust low idle speed to specifications with throttle stop screw.
c. Connect wire to solenoid.
16. If equipped with an A/C speed-up solenoid:
a. Disconnect wiring harness connector to A/C compressor and place A/C control in ON position.
b. Momentarily open throttle to allow solenoid plunger to extend, then adjust A/C idle speed to specifications with solenoid plunger screw.
c. Turn A/C OFF and connect wiring harness connector to compressor.
17. Remove enrichment tool an install PCV tube in air cleaner. Connect vacuum hoses to proper fittings.
