My A/F gauge at idle sometimes spikes. My RPM's stay normal, no jumping. My injector duty on my PFC displays about 4.4% at idle whether my A/F gauge is spiking or shoing a normal reading. As soon as I give it gas, if it spiking it will show normal readings on the A/F gauge. I do notice a change in the sound of the exhaust when it is spiking at idle. It sounds like there is a change in the rpm's but they are fine. Is it possible that I have an injector that is leaking a little causing my A/F to spike. Also, would a leaky injector cause my engine to flood easier than normal. The only reason I am asking is because I just had an issue with my engine flooding. I was just thinking if an injector might be stuck open dripping down, causing the engine to flood.

 

Bump?

 

injector "on" time is very very fast. probably 2-4ms depending on the maps on your PFC. are you using a regular o2 sensor or are you using a wideband?

 

regular o2 sensor

 

how old is it? do a voltage loss test on the wire and check for resistance points