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

MastaMoon - No worries man. As stated before, noone is driving their car around town with it tricked into thinking its cold all the time - one blatent problem would be that the PCM wouldnt turn on the fans. Those tests with the variable resister were only done to confirm the theory not for day-to-day operation. To get a perm fix to this, one must either use the Greddy to adjust injector pulse width or, I think, to get the chip adjusted so it uses a quicker and larger pump-shot during acceleration and make it so it runs "a little" richer through the injector tables. This whole thing has something to do with closed-loop operation - ie. using sensors and esp. the 02s instead of predefined tables), like you said. ....something with what I just mentioned - the fuel acceleration tables since its happening during acceleration but disappears when the secndaries open, ie. fuel enrichment. My actual personal opinion is that the closed-loop part throttle cruising is being held to stoic but dangerously close to lean, for fuel economy, but the prom doesnt have the adequate fuel advance plugged in for the different throttle positions and it lean mis-fires because of it. I believe this is exactly what you were saying MastaMoon. Trying to get WarMongers ideas on this as well (and anyone's opinion - there are alot of us watching this thread). I noticed in your sig. that you have a 2000 v6 manual. Your post doesnt seem to indicate you have any stuttering problems..? Might I ask you to post your PCM number and tear tag number? I can send that info to Diablo sports to cross-reference against my pcm and tear tags. The calcs will be different based on sport vs svt needs but we can see if there is any huge difference or odd changes in basic things like acceleration tables, etc etc. Thanks for the post in any case.