Thread: P0171 set on decel//update has another code

So i installed my Dynotech Transmission today.I had zzp program my pcm for the 3.29's,42.5's and the other basics that come with their pcm.I am setting a lean code on decel.Any way to fix that?More of tuning issue?My car has never set that code before untill i installed this pcm.I also checked all the vac lines.I am running good on wot.But once off it goes lean.The code was set at 1000rpm with 1% Throttle angle.When i had my buddy watch the tech 2 he said it was going lean right after i let off the gas from a wot run.

Did a few tests this morning.Fuel Pressure is @50psi @prime then drops to 42psi.Running its @40psi.When i hit fuel release to drain gas into a container it goes to 24-25psi.Same result as about a year ago when i was diagnosic a stalling issue.The grounds that connect to the transmission are good and tight.The mas air flow screen is in good condition.

Cleared the code from work tonight.Went to the gf's house and shut off the car and was there for an hour.Drove to the gas station 15minutes away still no light.Start the car up from getting gas and 30seconds later the light comes on.

YouTube - 02 values
I had a technician at my work give me some pointers.Watch both pcm 02 values to see if they were the same and were pretty close(i have an 02 sim for h02 2) .If they were then the pcm is not at fault.Test voltage at the 02 to see if the 02 is at fault or is really seeing a lean condition.I still have to test voltage.

I resealed the crossover since there was a small leak.The light still came back on.I am going to say the 02 sensor is defective.If i recall there are only 3 grounds that are on the transmission?Two little ones and one big one that all go on one stud.Could it be the pcm?I still think it it possible for some reason.

The other night i washed my engine campartment.The P0171 code went away and a P1133 H02 Insufficient Switching Sensor 1 came about.That has been the code setting for a day now.Now this morning i installed my new 02 sensor and now i set the P0171 code again.My 02 readings w/ the old sensor were around 940-960 now with this one they are 860=890---...