old93camaro

iTrader: (8)

Ok I have a 99 Trans am and after a heads, intake/tb and tune I have a crank no start, when i turn the key to the on position all i get is solid blinkers and security light goes on and off. SO since it cranks it cant be VATS but get this if i plug the odb-2 scanner tool in i get all lights and car will start. I'm lost of what the problem could be, seems like a ground but i have no clue. can anyone HELP.
Things I checked, Ignition and starter Relay, grounds and battery is fully charged.

sreve

iTrader: (3)

Scan tool is likely providing sensor grd it can be checked and is terminal 4 in the
data link connector. It is at the back of the left head.

old93camaro

iTrader: (8)

ok i will check that today, can i ground that to the chassis or does it have to be grounded to the ECM side?

sreve

iTrader: (3)

jump pin 16 to pin 4 in the data link connector with a testlight 16 is B+

or any source of 12v using pin 4 as a grd


check it at pin 5 also one is chassis grd the other is sensor grd
some diagrams show them swapped.

Pic is from EFI live showing pin5 Alldata shows pin4

The actual grd point is behind the left head.

old93camaro

iTrader: (8)

ok just jumped pin 4 to 16, key off i get a bright 12v light and key in the on position i get a dim 6v light. Does pin 16 need 12v at all times to make the car start?

old93camaro

iTrader: (8)

so if i'm getting a dim light i need to check the grounds at the back of the head to make sure they are connected? in is this the driver side head or passager side

old93camaro

iTrader: (8)

thanks sreve, I'm happy and pissed at the same time. i got a paper clip and grounded pin 4 and 5 and the damn car works, so now i have to find a chassis ground to ground both 4/5 and then put the car back together and get this thing back on the road.

sreve

iTrader: (3)

The bad news is you really need to get to the back of the drivers head
to fix it right.

old93camaro

iTrader: (8)

Yea i just got done doing it and the wires are corroded so i had to pull everything off just ot get to the wires to clean them, now i can final work on getting the car to idle which should be easy lol

old93camaro

iTrader: (8)

Car is up and running just put some miles on it and I would like to thank Sreve for all of his help. Took three days to find a easy problem, you live and you learn