Jared_blown5.0

hi i just fired up the new 347 combo today and here is my problem. It will surge like crazy and die instantly, or if uyou hold it at 1800 rpms it will run for about 3-5 mins andd then all of a sudden just cut out and die. Right before it cuts out and dies the fuel pressure jumps up. What can i do??????? please help me
-Jared

turbostang21

what's your fp, inj size, timing?

Jared_blown5.0

38 psi, 42# injectors, 12 degrees

Jared_blown5.0

wow no one?

GaryBisiniere

check for vacume leaks and then the timing

88ragtop

42# injectors seem like a bit much for your setup.

grabbem88

38 psi with vac hose unhooked?.....42's are a pain to tune with stock computer...i run 41 psi with my 24's

given the only diff i see with yours,and mine is 41 cubes your way,and also i have 18* timing.

i'd back off the psi a little,and see what happens...

5.0 MPG

Id advance your timing a little also.

turbostang21

i'm assuming your maf is calibrated to the 42's...but they are too big unless you're going to boost it. i too would lower the fuel pressure as a start, sounds like it's dumping. what happens if you start the car at wot....

Jared_blown5.0

its not timing, if i start it a wot it hops right up and redlines. lower fuel pressure to say 35?