1990bird

i recently bought a 1990 firbird for my g/f it came with a blown 3.1 so i swapped in a 350 and 700r4 i wired all the gauges and fuel pump from my haines manual which leaves alot to be desired. my new problem is the start wire has no power with the key in the start position to i have to use a jumper wire to start it i no this car has a key chip and i prolly disabled it when i removed the computer to swap the v8 in the manual have a very wortheless digram for the circuilt so any help would be great thanks in advance

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jpeden31

okay, i'm having the same problem too, showing no juice at it in start on the meter, i can jumper a 12v+ wire to that connection and it starts right up and runs. did you fix your problem or still waiting on a response? i can't seem to find a fix in the forums, i'm still lookin though

BigBadLou

The starter circuit is one of the simplest in our cars. Very easy to troubleshoot.
Power goes to the ignition switch (atop the steering column under the dash), then to the starter enable relay (if equipped), then to the neutral safety switch on the auto shifter (or the clutch pedal switch) and finally to the starter.
The wire colors change throughout the path but with a diagram, it's not hard at all to figure out where the power stops.
Some diagrams to help: http://www.austinthirdgen.org/index.php?pid=19

Lou

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'91 Z28 convertible w/305TPI WC T5 (no more auto)
"Nothing screams more of poor craftsmanship than wrinkles in your duct tape!"

1990bird

my problem was the enabler relay

jpeden31

Okay... lemme check the neutral safety switch. i think the ignition switch is good, when it turns to start the water temperature gauge maxes out and some other lights go on. alldata says to pull up the floor console cover so i'll get started on that. thanks

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yes... i am a forum troll

best time so far
17.3@78mph need to fix the fuel starvation and shift linkage

jpeden31

okay, neutral safety switch checks out good, the blue/black wire input is hot 12v, purple output is to starter, yellow input is from ignition, jumpered the black and purple and it turned over, yellow had no signal at all at any key turn setting, started to backtrack it to the ignition switch but below it was a black box that said GM Goodwrench Vehicle Security System that the yellow was plugged into i jumpered it with the yellow/red wire and tried the key, started right up. looks like that black box was discussed here (VATS diagram?? no start 89 firebird mpfi V6)
so i'm gonna undo that terrible wiring mess to remove it and continue with resto, thanks for those diagrams they are wonderful