Contour Enthusiasts Group Archives Forums Modifications 3.0L Duratec ?Help tracking down the stuttering problem....Long...

This is very positive. I think that the reason I have seen good results with the back plate removed was because I had the 24# injectors in. My computer leaned out the fuel delivery because of that. When I cut the center post, the airflow signal went down and then the pcm didn't have to lean out the fuel system as much.
The problem with my car seems to be a non-linear increase in airflow that is too rich at idle but just right in the low rpm area is causing the computer to lean back the fuel trim. Then after it has the mixture adjusted right for its purposes, it no longer is adjusted right at the problem rpm.
THat goes along with the fact that I noticed the best overall driveability (without the GReddy) with just the backing plate removed. Once I removed the whole center post, I didn't get enough fuel delivery at high rpm.

warmonger
(you guys can refer to me as Tom if you want)