I have a 1990 350 tpi engine that won't start untill the battery is close to being dead. When the battery fully charged the engine cranks but won't start, as I crank and crank the battery wears down then the engine starts and runs for a couple of seconds. Is there a reason for this? Any info will help cause I'm stumped.

 

You might want too look at your injector pw correction vs battery voltage table. What .bin are you using ?

 

.bin? The thing is i'm stalling it in body that has been completely stirpped of its wiring. Luckily, when I bought the engine and tranny, I took the wire harness and computer. I wired everything up, as far as engine wise,but it won't start till the starter cranks slowly from lack of power. What should the injector voltage read?

 

You posted in diy prom ? I thought you were doing reprograming

 

you might get a better response in the right category but do you have consistent spark and what is your fuel pressure at ?

 

No, not right now but I would like to know how to. I took out the manifold and am running headers so info on how to or where to get the prom would be a great help

 

use a fuel pressure gauge on the schrader valve fitting towards the rear of the passenger side fuel rail. No need to reprogram your memcal for just a header swap instructions on tuning are in the stickies.

 

I havent checked the fuel pressure but that will be my next step. Thank you for your help and I'll post in the right category

 

It sounds like the fuel pump relay is not working. So as you crank the oil pressure finally increases and that turns the fuel pump on.

Thread moved to general tech section and welcome to TGO.

RBob.