piskapo
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I'm having an issue with AFR when not on boost. it will spike to 16 and sometimes even show - on the AEM gauge. I have replaced the O2 sensor and the sensor for the gauge. When on boost it's working properly. I have a 2014 LTX and i've checked the header very quickly and didn't see any cracks. Any suggestions on what to check next. I will pull the header off completely tomorrow and verify no cracks.

Dinner
Lifetime Member
When your idling, accelerating easy and cruising where your 0 boost, the gauge is reading 16? Or when you snap off the throttle, the gauge spikes to 16 for a split second? Also, pc5 or gems?
piskapo
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Pc5 while accelerating easy and cruising.

petey_sx700
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Maybe check out Bad O2 sensor? thread. Could it be the high idle control valve just like Tator? Lets air in if it sticks?


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That's too lean or a bad sensor.
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