Help needed with odd dyno results (2.5l time trial car)

[The Radium King]

what codes were you getting when it wouldnt run closed loop?
was this recent - did you reset the dme?
were you getting any trims - rkat, fra?
the dme switches between open and closed loop based on engine speed (rpm) engine temp, and throttle position - perhaps on of these sensors is wonky (hmmm, throttle position comes up again ...).

[truegearhead]

Originally Posted by The Radium King

what codes were you getting when it wouldnt run closed loop?
was this recent - did you reset the dme?
were you getting any trims - rkat, fra?
the dme switches between open and closed loop based on engine speed (rpm) engine temp, and throttle position - perhaps on of these sensors is wonky (hmmm, throttle position comes up again ...).

Radium King I can’t thank you enough for your help! Here’s answers to your questions


-I forgot to mention resetting the dme. I tried this multiple times and finally letting it reset over night did the trick and allowed the car to run.
-The dme was switching back and forth at open closed loop at idle.
-I replaced the engine temp sensor during the original trouble shooting
-I haven’t replaced the TPS, could it cause a repeatable rpm related problem?
-The only codes were rear O2 sensors and random misfires(before dme reset)