Fuel issue

[loud 95]

I have a 255lph in-tank fuel pump in my '95. Ever since the install, the car has been running insanely lean. My air/fuel ratio is about 19.7 to 1 (far from stoich). No matter what I do with my Aeromotive reg, this ratio stays about the same. It seems that my ECU is still under the impression that the pump is factory. Do I have to buy an aftermarket chip to address this issue? Or is there another way? Any help would be much appreciated.

 

[SorsCode]

19.7 is lean.....14.7 is idle 12 is perfect for WOT with S/C cars 12.5-13 with N/A

When I first installed my 302 my car ran wicked lean like that and I ended up fixing it with a Pro-m Maf and 24lb injectors..

 

[SorsCode]

also how are you getting your info??? are you using a wideband O2???? I'm using a LM-1

 

[red94fiveo]

19.7 is very lean, this cannot be good for your car. Also, as stated above, what are you using to gather this data?

 

[loud 95]

I am using a computer-based diagnostic scope which is taking the reading directly from the tailpipe.

 

[final5-0]

Go stick the scope up a different pipe to check it out.

Sounds nasty *** don't it

Later
Grady