AnnivSS

Im about to shove a rag in the gas tank of this car and blow the SOB up.


Last year I had an issue with a gremlin in the VATS system which caused a MAJOR inconvenience at the worst times possible. And when wasnt starting there was no signs of anything "wrong". The accessories would all come on. The transmission would unlock. The fuel pump would turn on. But still, no start. So far I have...


1. Replaced Battery
2. Replaced Alternator
3. Bypassed VATS w/ Resistor
4. Replaced BCM and PCM
5. Replaced Starter



Since replacing the starter I have had 0 issues with it for about a year. Last week it started doing it again, however this time, the security light and "service engine soon" light come on solid and stay on. Its been intermittent until tonight. All day today, no start. I took apart my VATS bypass out to check the wires and found one of the connections to be a bit loose. So I rebuilt the bypass harness and reinstalled. Tried to start the car, no change. Ive taken the starter, alternator, and battery out and had them all tested. They all show good. Im completely stumped as to where to go next, anyone have any suggestions?

wrencher

iTrader: (2)

The vats by pass is sent a 5 volt reference one one wire.
The other wire is back to the BCM a lower voltage depending on needed resistors.
Check those 2 white wires @ the main underdash connector. 1 is 5v other something over 1 volt. that can confirm you have continuity thru the by pass & the voltage is getting thru.
Thats a start.

itsslow98

iTrader: (18)

You could always have a tuner turn the VATS off and you would be done with it.

nomasterase

iTrader: (4)

What does the car do when you turn the key? Crank but no run or nothing at all?

AnnivSS

Supposedly he's already done that when the car was tuned.

Nothing at all, the accessories come on, trans unlocks, fuel pump turns on, then nothing. It started last night and this morning so perhaps my VATS bypass wire was the problem. We'll see how long it lasts this time.

nomasterase

iTrader: (4)

If it does it again id check the ignition switch to make sure its not going out. To clarify I mean the electrical switch on top of the column under the dash not the lock cylinder

AnnivSS

Yeah I think my next trick is going to be going ahead and replacing the ignition switch assembly. At which time i'll probably remove the VATS bypass.

wrencher

iTrader: (2)

Tuning out VATS in the PCM wont help when the BCM controlls the starter relay.

slow

iTrader: (7)

Ground the starter relay, to take the BCM out of the equation. (small starter relay under the hood)