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Originally Posted by sbourg
What will happen is increased idle speed, but a lean mixture. The O2 sensor will report this to the ECM, which will presumably enrichen via the EHA. However, much else could be going on here, including a bad O2 sensor, so I think it is time to take some readings from the diagnostic socket.
Steve
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Hi Steve,
The ECM would enrich the mixture if a vacuum leak were present. That would allow the car to still have some pulling power instead of backfiring and stalling the way they used to do before
the days of ECMs
I would guess that the 02 sensor was working properly, thereby telling the ECM to enrich the mixture.
Disconnecting the 02 sensor temporarily should lower the rpm and make the car act like an
old one with a carb. (eg. backfire and stall when attempting to rev the engine under load).
Is my thinking wrong?