Fuel trims not changing from 0 at all on logger!?

[adam355]

The fuel trims are stuck at zero, I have high timing at idle, negative timing in lo throttle cruising, and my 02 sensor voltage isn't moving too much. Its pretty much just stuck at rich. Does this just mean I need a new upstream 02 sensor?

 

[adam355]

update: The o2 is basicly stuck in the .9s at idle and doesnt cycle at all. I also just noticed that the karman airflow readings on both the afc and the logger arent showing anything other than zero at all. All I have done to my car is changed plugs and wires, and have been screwing around with injectors, but right now I just have 450s in with brand new o-rings and insulators. I haven't touched anything else on my car.

 

[kpt4321]

If the karman Hz are zero, then you probably also have a check engine light, correct?

Plug your MAS back in.

 

[adam355]

I tried unplugging the battery, no use....and I don't have my MAS unplugged.

 

[adam355]

Okay there is an error code on the logger and is like you thought Volume Air Flow Circuit Malfunction. I couldnt get it figured out earlier because it only showed the code and not the explaination. So what are the possibilities...? Busted MAF,wiring, ECU?

 

[adam355]

Problem fixed. Connection came loose in AFC, thanks everyone. Including Buschur Racing for helping diagnose the problem. Time to start tuning 650's now.