Bucking issue...

[Girls can too]

Unit 5302 made me come over here and bug you with my problems. I have a long list of mods and a longer list of things that have been done over the past couple of months to clear up this issue. This thread is only for the people who are a. Intrigued or b. Bored out of their skulls.

Basic Mods:

306
E303
TW heads
TF (Track Heat) intake
65mm TB
30# injectors (running a FMU)
255 in tank & T-Rex inline pump
New MSD Cap/Rotor/Dist/Coil/6AL Box
4" Power Pipe
Long tube headers
ProM 77mm MA calibrated for a S.C. & 30#er's
Vortech S-Trim w/10#'s

History:

The new set up was installed in Sept. I've had the problem ever since. When racing (under boost) it's fine. Pushed out almost 500 at the wheels with only 7psi. (The issues causing it to pull low boost have been solved.)

When driving it anywhere between 1500 & 2700 rmps the car will begin to buck. As if I were driving in fourth gear. Give it throttle and the buck disappears. Lay off of the throttle and, once it returns to that gray area, it begins to buck again (and not slightly). ~rubbing neck...ouch!~

The following has been checked, tried or replaced, even with only 1500 miles on the new motor:

-All of the wiring was moved into the fenders and has been double checked and securely fastened, read on a Ford scanner and seems to be working properly.

-Fuel pressure is @ 38 and vacc at 15idle/10 basic throttle

-Tried another ProM calibrated the same way (for the 30's and S.C.).

-Cleaned the idle air motor and throttle body. Drilled the hole in the throttle plate 2 drill bits larger.

-Replaced and adjusted the TPS to .999

-Replaced all wires (Taylor 409's) & MSD cap & rotor.

-Bypassed the MSD box.

-Cleared the factory computer

-Replaced the O2 sensors

-The timing is @ 10'

Geeze, the list goes on. I'm just looking for something maybe over looked. Everything else is now perfect. As I said though, there's too much to list and I can't afford to continue replacing parts that in the end are fine. So someone pleeease throw somthing at me. (A brick preferably!)

I have to get my car back to it's daily driver status soon. I've had it looked at by a Ford mechanic, numerous friends and at my job (a Ford performance shop). I am at my wits end and only have three weeks until driving south for FFW. Is there something maybe I've over looked? Some trick of the trade I've never heard of? I sure hope so!

Thanks for listening and I look forward to your suggestions!

------------------
Nicolle Douglas
Girls Can Too, Editor
The Mustang Works Magazine
1993 Mustang GT - Supercharged K.C. 306
483.6 rwhp / 472.1 torque @ 7 psi

** Thanks to everyone for your ideas! I will definitely check into the computer issue. Thinking of a PMS for it. That would help for sure.

[This message has been edited by Girlscan2 (edited 04-17-2001).]