The AFR & STFT fluctuate, DTC P0172&0175
09-13-2009, 02:54 PM
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The AFR & STFT fluctuate, DTC P0172&0175 Hi, My LQ9 in my Firebird -68 does not run as expected, First of all I get the DTC P0172 and 0175. Second, the WBO2 bounce from 12 to 18 AFR and it correspond to the short term fuel trim value that jumps between 0 and -25%. This occures when I drive at 40-80 km/h with constant TP. I have moved the LH O2-sensor to the RH-side and vice versa and it did not change any thing (I thought that I should get DTC 0171&0174). The WBO2 is located after the exhaust cross-over. Look att the screen dump from EFIlive.
09-13-2009, 03:42 PM
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Hi, My LQ9 in my Firebird -68 does not run as expected, First of all I get the DTC P0172 and 0175. Second, the WBO2 bounce from 12 to 18 AFR and it correspond to the short term fuel trim value that jumps between 0 and -25%. This occures when I drive at 40-80 km/h with constant TP. I have moved the LH O2-sensor to the RH-side and vice versa and it did not change any thing (I thought that I should get DTC 0171&0174). The WBO2 is located after the exhaust cross-over. Look att the screen dump from EFIlive.
09-13-2009, 05:55 PM
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