So I got my car tuned by Jeff at Rotary Power and for a few weeks everything was great but now it seems that my A/F is really random. I'm running a single turbo with a street port, 3 mm seal and a Apexi Power FC with DataLogit. So my numbers seem to be becoming very random. Sometimes when I start the car it runs fine, other times my idle drops to 12.1 on the A/F and my garage smells like fuel. Other times at idle it jumps up 16.1 and runs really rough. It seems that most of my problems are at idle when driving the car stays at around 14.7 to 15 when cruising and 12.1 at WOT. However on occasion when accelerating either normally or at WOT my AF drops to 10.8. I guess I should be thankful that for the most part my car errors to the rich side, but I'd like to know if anyone else had this problem. Could one of my sensors be going out, maybe Air Intake Temp, is this something else, or just an inherent flaw with the PowerFC?

 

Sure there could be something mechanically wrong, but I mean the weather changed, the A/F ratio changed. That's not a surprise.

 

In SoCal, weather doesn't really change.

 

No one else with any ideas? Could it just be time to go with an adaptronic?

 

the PFC is actually pretty consistent, its much more likely that you have something mechanically wrong.

or maybe it is worth looking to see if you have something mechanically wrong, before buying another ecu.

 

Any ideas on what could be going wrong? Where I should at least start?

 

there is a sensor/switch check screen in the PFC commander, you could look at that and see if the sensors are working properly... the hood opens too

 

Have you done the Fuel pump rewire? I had intermittent fuel issues ,before it just started going lean . I did the fuel pump rewire and everything has been good since ,

if your pump is getting inconsistant Voltage it may be causing the issues you have .

OR your injectors are giving you issues sometimes maybe staying open and causing the very rich idle .

But I'd start with the FP first .

 

Ooo, good call. I've had the car for about a year and a half and I don't know if the previous owner did that