Airflow Sensor & Mixture Control Unit
- Operate starter or run engine at idle. Turn ignition OFF after pressure has built up and stabilized. Remove air duct assembly. Lift sensor plate by hand until it is slightly unseated. Gradually raise plate to limit of upward travel.
- Steady resistance should be felt over entire travel of sensor plate. No tight or binding spots should be evident. If so, check for dirty pivot or need for lubrication.
- Ensure sensor plate is centered in inlet cone. If adjustment is needed, loosen centering bolt. Insert a 0.004" (0.10 mm) feeler gauge around outside edge of sensor plate while sensor plate is seated. Apply locking compound to threads and tighten centering bolt
- When sensor plate is pushed down quickly there should be no resistance felt. If binding or sticking is evident, replace sensor plate. Now, lift sensor plate and push down quickly. DO NOT bottom stop plate. Control pressure resistance should be felt. If not, clean control plunger or replace fuel distributor as necessary.
- If sensor plate lever is hard to move in upward direction but moves freely when pushed down, control plunger is sticking or binding. Remove fuel distributor and clean control plunger in solvent. Reinstall plunger and recheck. Replace fuel distributor if plunger still sticks or binds.
- To adjust sensor plate position for height in cone, loosen fuel line to control pressure regulator where line is connected to fuel distributor. Fuel is under pressure and some fuel will escape when fitting is loosened at fuel distributor.
- Upper edge of sensor plate must not be above edge of air cone. See Fig 1. Plate may be positioned slightly lower, but not more than 0.020" (0.5 mm). If too high or too low, adjust by bending wire bracket beneath sensor plate. Check idle speed and CO% level after making sensor plate adjustments.
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