On Sun, Feb 19, 2023 at 06:00 PM, Michael Diehr wrote:
I've read some posts mentioning that failing Oxygen sensors can cause the N80 to malfunction and not throw a CEL, but I'm wondering if this is rumor or there's actual science behind it?
I don't understand all I know about this, but I believe that could be true under exceptional circumstances.? The ECM controls the N80 based on other inputs, including the O2 Sensors.? However, in most situations where the O2 sensors were 'bad', you'd get a CEL.? I think they'd have to be reacting very slowly to not throw a CEL nor open the N80.? The training manual for EVAP, 841903, says:
"Based on information from the Oxygen Sensors about the fuel to air ratio in the exhaust, the ECM opens the EVAP Canister Purge Regulator Valve and allows vapor from the EVAP Canister to be drawn into the Intake Manifold."
BTW, I was going to upload the relevant section, but apparently the group is set up so that only moderators can upload files or photos.? They could be included as attachments though.
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Duane
05HD Rialta
220K Miles
Duane