I just corrected this problem on my 07 Mustang GT, running a Saleen SuperCharger + 475 hp kit. I had been living with this hesitation for a while and just got tired of it. My car ran perfectly after warming up, but had very big hesitation until warming up. Brenspeed is who has been working with me since I originally purchased my tunes from them.
If you have any questions, talk to Chandler at Brenspeed. They have been working with customers running SC's and correcting this problem for a while now. Steeda actually makes the oil seperator kit for this issue.
What is happening is the SC pulls much harder than stock and only having just a vent tube on the line, it pulls oil through the PCV hose. The oil collects in the throttle body and at cold start with the butterflies just barely open, the collection of oil blocks the air enough to cause the hesitation. But after warmng up and the butterflies being more open, you don't get the hesitation.
Also, I don't know if this has also happend to you guys, but once in a while I would get a puff of smoke at cold start. Again with the oil settling in the throttle body, I got a shot of oil and a little smoke.
I have had my oil seperator on my car for about 3 days now, and it has corrected the problem. I have done everything I can to try and test this new mod, and so far everything is great. I hope this helps.
There are a few write ups on this in different forums, but here is one:
http://allfordmustangs.com/forums/20...ttle-body.html
Please let me know if I can help anyone further with this issue. I am new to this mod myself, but I would like to repay the favors I recieved on this forum in any way I can.
Thanks,
Keith Orr
Payson, AZ
RCMC