B Series Truck 2WD L4-2184cc 2.2L 2200 2-bbl (1990)
Air/Fuel Mixture: Adjustments
1.
Check engine condition (spark plugs, ignition timing, leaks in hoses, float level, etc.).
2.
Turn all electrical loads "OFF."
3.
Warm up engine and run at idle.
NOTE: This adjustment must be done while cooling fan motor is not running.
Fig. 42 Test Connector
4.
Connect dwell meter (90 degrees, 4 cylinder) to air/fuel check connector (BR/Y).
Fig. 43 Duty Cycle
5.
Check idle mixture (duty) at specified idle speed.
IDLE SPEED: 825 ± 25 rpm in neutral or "P."
IDLE MIXTURE:20° - 70°
NOTE: Idle mixture adjustment is normally unnecessary. If mixture is not as specified, check feedback system.
6.
If idle mixture requires adjustment, proceed as follows:
Fig. 44 Concealment Pin
a) Remove carburetor and knock out spring pin. Reinstall carburetor.