On the dyno the other day and had problems. I have a b20 vtec stock bottom end B16 head Gsr cams. I have upgraded fuel with walbro 255 pump, AEM fuel rail, Fpr and rc 370'ss. Car was on the dyno and in the middle of the run, the wide band o2 sensor went lean. This was repeated numerous times while attempting to correct the problem with a vafc. The only thing we could come up with is that for some reason my motor is blowing alot of condensation and that is what is causing the o2 to go lean anyone else have this prob??????

 

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