Auto, 450's, what base fuel pressure?

[blktalon3]

I just got a afpr today. I haven't got a chance to put it in yet, but I have a question. I looked up what to set the base fuel pressure at and I found a thread that said a 1g manual was 36.3 and an auto was 42.7. My question is I have an auto trans with 450cc injectors with an auto computer, should I still set the base pressure at 42.7 or will that make it rich with the 450's? I also have one more question. Right now all 3 of my fuel trims are stuck on 139. I'm thinking its my o2 sensor. According to my logger it seems to be working fine, cycles, etc. Could it still be bad even though it seems alright? Also I'm throwing a CEL for a coolant temp sensor. I have a new one ready to put in, but I'm wondering if it might have something to do with them also.
Thanks for your help

 

[snowborder714]

1G auto - Spec 42.7psi (Standard value 41 - 46 psi)

I would set the fuel pressure to what the ECU is used to seeing. Then check out how things are running using your logger and make changes if necessary.

 

[Spades]

My question is I have an auto trans with 450cc injectors with an auto computer, should I still set the base pressure at 42.7 or will that make it rich with the 450's?

Your stock fpr is already 42.7psi, so setting your afpr to 42.7psi will do nothing for you, with 450s it will run rich because your stock injectors were 390s

 

[blktalon3]

I'm thinking I should be rich but my fuel trims say i'm lean. The o2 sensor is the original, you think it could be to blame?

 

[snowborder714]

Have you verified that it's cycling properly (.05 to .95)?

 

[lazyazzdaddy]

I'm thinking I should be rich but my fuel trims say i'm lean. The o2 sensor is the original, you think it could be to blame?

are we talking about the oem 02? from what I know there not accurate

 

[blktalon3]

Its cycling alright. According to my logger its doing every thing it should but I'm wondering if it could still be bad even though it seems OK. Yes its the original OEM.

 

[lazyazzdaddy]

I just got a afpr today. I haven't got a chance to put it in yet, but I have a question. I looked up what to set the base fuel pressure at and I found a thread that said a 1g manual was 36.3 and an auto was 42.7. My question is I have an auto trans with 450cc injectors with an auto computer, should I still set the base pressure at 42.7 or will that make it rich with the 450's? I also have one more question. Right now all 3 of my fuel trims are stuck on 139. I'm thinking its my o2 sensor. According to my logger it seems to be working fine, cycles, etc. Could it still be bad even though it seems alright? Also I'm throwing a CEL for a coolant temp sensor. I have a new one ready to put in, but I'm wondering if it might have something to do with them also.
Thanks for your help

I would check the wiring connection on the temp sensor. I had a similar problem with mine and it was just a loose wire at the sensor..... Personaly I would get a wide band and see if that helps..my stock fr o2 works but it's limited in function with a wide band you'll get a much better idea of whats going on expecially when makeing changes to the fuel system