I've got a vehicle that is running less than one tenth of a volt on O2 sensor...I can trick vehicle to run rich at 0.9 volt.
This is a 1984 Bosch LH II system, which currently is only using the Air Mass Meter (Mass Air Flow) to determine fuel amount.
At this time, I have concluded the ECU (ECM) is messed up.
Question - It drives OK....no higher RPM misses...just smooth driving. At idle, its a pinch rough.....should I fix it?
Water temp is OK....
What vehicle ? What engine ? How are you tricking it to run rich ? Any codes stored ?
Maybe in modern engines it is safer, but running too lean in the past was a good way to burn piston crowns and valves.
1984 Volvo (2.3 Liter)...no codes possible on Bosch LH II system.
I pull plug on Air Mass Meter...it will run rich.
Oh well, I'll just buy a rebuilt ECU (ECM) for it
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