01-27-2008, 10:08 PM
Join Date: Jan 2008
Total Cats: 0
Stock o2 Sensor failure?
I have recently switched to larger injectors (RC 440s) and "non-afm" mode of the MSPNP.
I have a wideband o2 sensor and gauge that is not connected to the MSPNP, just used for reference.
I have a the stock narrowband o2 connected to the MSPNP as well as to a split second AF gauge.
Before I switched the injectors, both the o2 sensors and the o2 readout in the Megatune all stayed in sync. Now it seems like the narrowband o2 is not working. The o2 readout in Megatune updates very infrequently, like 1 time a minute. The Split Second (narrowband gauge) also seems a bit 'frozen'. The sensor I have is heated, but the readings never seem to go any lower than 15AFR. The wideband is definitely working and the engine reacts to the tuning as expected.
I am just wondering if my stock o2 sensor might have failed, or if there is some issue with how it is wired. I am skeptical about the wiring being the problem because it worked fine before. I just wonder if the 20-30 minutes of the car idling very very rich while I tuned it somehow fouled the sensor.