My apexi turbo timer stopped giving me an A/F reading yesterday. It still sends the o2 voltage but i want to see the theoretical A/F. any ideas as to why it might have stopped sending it to the timer?

Bad wire connection? Faulty Unit?

Originally posted by CODE4
Bad wire connection? Faulty Unit?

I was thinking that, but the o2 voltage shows on the timer, as well as battery voltage.

Originally posted by bnisson

Originally posted by CODE4 Bad wire connection? Faulty Unit?

I was thinking that, but the o2 voltage shows on the timer, as well as battery voltage.

Well if the O2 voltage signal is accurate, but A/F reading then there is your answer.

Originally posted by CODE4

Originally posted by bnisson

Originally posted by CODE4 Bad wire connection? Faulty Unit?

I was thinking that, but the o2 voltage shows on the timer, as well as battery voltage.

Well if the O2 voltage signal is accurate, but A/F reading then there is your answer.

...i'm confused.

You have a lot of learning to do with this car bro.

O2 voltage is directly drives the A/F ratio. Typical WBO2 sensors read 2.5 volts as stoich, 14.7:1. So corresponding voltages relate to air/fuel ratios. There is not two separate wires from a sensor for a dedicated O2 voltage, and A/F signal.

So if your turbo timer reads one but not the other, it is likely to be an internal problem.

Contact the unit's manufacturer for more information about it look online for a manual or FAQ.