5.7 liter fuel problems, speed density

[Vicstruck]

i ran into a problem i need help with, i have a 5.7 chevy running on a P01 ECU. we have been running on a speed density tune for months now, O2's turned off, MAF turned off and unplugged.

Last week it drove to work just fine with a 14-15 AFR but when i went to leave work the AFR gauge was off the chart. Come to find out it was running so rich it won't read. I have double checked my tune, the wiring and replaced the MAP and TPS.

does anyone have any direction on why this would happen?

[kevin87turbot]

It could be a bad MAP sensor, or coolant temp sensor or air temp sensor. Just scan it and see what codes you have. That will point you in the right direction.

[Vicstruck]

thats why we are getting frustrated, replaced the MAP and subbed other temp sensors in it.

[blindsquirrel]

Does it run like it's rich, or is that just what the wideband is saying?