If anyone has tried to adjust an AMM I would like to know how many turns it takes to see any change in the fuel mixture when reading voltage off the O2 Sensor.

My car has been running very rich and am suspecting the AMM after replacing and diagnosing many parts. I tried to adjust the sensor but turned the screw 100 times counter clock wise to no effect – would this reinforce the possiblitiy the AMM is not working?

I have checked the voltages at the connector and the AMM does give an increased voltage signal when load is applied – since there seems to be no other method of diagnosing the AMM I am playing around with it until I get another one to swap out.

Thanks



Past tests and fixes are as follows:

-Fuses – all good and connectors clean
-Throttle Body was removed and cleaned
-Fuel pressure regulator was replaced
-Fuel relay was checked–operational
-Fuel pumps both working – audible
-Injector Ballasts tested for proper resistance – all in spec
-Air filter clean
-RPM gauge jumps when cranking - assume MAP sensor operational
-Cap and Rotor replaced
-Coil to Distributor Wire Replaced
-Coil swapped with new coil - no fix
-Engine Temp Sensor replaced - twice
-Air Mass Meter checked as per FAQ
-O2 sensor replaced - readings are true - leans when induce air leak or pull injector connection
-Engine wire harness - removed - much corrosion, replaced all bad wiring and --installed
-Injectors cleaned and balanced.
-Engine computer swapped - no fix
-Fuel pressure gauge installed and is 42PSI and 36 PSI when running
-All grounds checked
-Idle Air motor replaced (it needed it)
-Power stage swapped with known good unit
-Hall Sensor and distributor replaced