LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Vats system

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Old Oct 3, 2022 | 11:48 PM
  #16  
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Re: Vats system

Originally Posted by GaryDoug
Do you mean that the starter ran while doing that or do you mean that the starter operated normal after that?
before the starter wouldn't turn at all. But the security light still worked and the fuel pump would prime like normal. But after I tapped on the starter with the jack handle through the headers, the starter started turning but that's when the security light and the fuel pump stopped working. And it also has no spark now. But also 5 minutes before all this started, I actually started the car and it worked just fine.
Old Oct 4, 2022 | 05:24 PM
  #17  
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Re: Vats system

Originally Posted by GaryDoug
Do you mean that the starter ran while doing that or do you mean that the starter operated normal after that?

Could that little wire thats a little bare in the pic coming off the starter have anything to do with whats going on?
Old Oct 4, 2022 | 06:53 PM
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Re: Vats system

The bare wire is the purple 12 volt input to the solenoid. With a VATS problem (key or theft deterrent relay) that wire would not be hot with the key in the “START” position. You were trying to connect the 12 volts from the main cable from the battery to the starter (the heavy black wire on the stud to the left) to the stud in the center for the solenoid. A spark may have damaged the purple wire.

But that places the jack handle very close to the PCM ground stud. And the ground wires and the purple solenoid wire are in the same harness bundle, along with the knock sensor and right bank O2 sensor wires. I'm just GUESSING somehow 12 volts hit the ground stud and back-fed the PCM, damaging it. Or it simply burned through the thin PCM ground wires.

You definitely need to examine the ground stud and the wires for signs of damage. Then try and scan the PCM to see if it’s still functioning.
Old Oct 4, 2022 | 09:24 PM
  #19  
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Re: Vats system

Originally Posted by Injuneer
The bare wire is the purple 12 volt input to the solenoid. With a VATS problem (key or theft deterrent relay) that wire would not be hot with the key in the “START” position. You were trying to connect the 12 volts from the main cable from the battery to the starter (the heavy black wire on the stud to the left) to the stud in the center for the solenoid. A spark may have damaged the purple wire.

But that places the jack handle very close to the PCM ground stud. And the ground wires and the purple solenoid wire are in the same harness bundle, along with the knock sensor and right bank O2 sensor wires. I'm just GUESSING somehow 12 volts hit the ground stud and back-fed the PCM, damaging it. Or it simply burned through the thin PCM ground wires.

You definitely need to examine the ground stud and the wires for signs of damage. Then try and scan the PCM to see if it’s still functioning.
I wasn't trying to jump anything with the jack handle i was just tapping on the solenoid in case it was stuck.
Old Oct 4, 2022 | 09:25 PM
  #20  
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Re: Vats system

Originally Posted by shayhenderson88
I wasn't trying to jump anything with the jack handle i was just tapping on the solenoid in case it was stuck.
and can you send me a pic of where that ground stud is located?
Old Oct 4, 2022 | 10:47 PM
  #21  
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Re: Vats system

I gave you a link to the ground stud photo in post #13…… didn’t you look at it?

Whyever or wherever you were randomly poking around with a jack handle, there's a chance you did electrical damage or mechanical damage. Shorting the 12 volts from the battery to the solenoid is generally done with a screwdriver to bypass the ignition switch.
Old Oct 5, 2022 | 12:20 AM
  #22  
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Re: Vats system

Originally Posted by Injuneer
I gave you a link to the ground stud photo in post #13…… didn’t you look at it?

Whyever or wherever you were randomly poking around with a jack handle, there's a chance you did electrical damage or mechanical damage. Shorting the 12 volts from the battery to the solenoid is generally done with a screwdriver to bypass the ignition switch.
ok. I see it now. I only seen the 2 links at the bottom of that post before. But based on that pic and where the starter is located I wouldn't have been nowhere near that ground. I tapped on the starter solenoid through the top through the headers. That ground looks like it is located more toward the bigger part of the starter motor itself. Like if I was to jack up the car and was to go through the bottom instead. I just knocked on the solenoid, the smaller part of the starter. But for sure that wire going to the theft deterrent relay being loosed on the starter wouldn't cause the problem I'm having with no fuel and no spark even though the starter is turning over?
Old Oct 5, 2022 | 08:45 AM
  #23  
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Re: Vats system

Well…. that was about the best I could come up with. Maybe someone else will have a better idea.
Old Oct 5, 2022 | 01:54 PM
  #24  
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Re: Vats system

Originally Posted by Injuneer
Well…. that was about the best I could come up with. Maybe someone else will have a better idea.
thank you for all your help
Old Oct 5, 2022 | 10:50 PM
  #25  
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Re: Vats system

"Then try and scan the PCM to see if it’s still functioning."...do it.
Old Oct 5, 2022 | 10:57 PM
  #26  
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Re: Vats system

Originally Posted by GaryDoug
"Then try and scan the PCM to see if it’s still functioning."...do it.
I've been trying to find someone local to scan it for me but haven't had any luck.
Old Oct 8, 2022 | 11:17 PM
  #27  
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Re: Vats system

Originally Posted by shayhenderson88
I've been trying to find someone local to scan it for me but haven't had any luck.
You have a car that is "special". Unfortunately or descriptively that means it requires special treatment. You can buy a cloned Tech 2 from China for about $300 (takes a few weeks) ... or you can buy a scanner that can do some diagnostics... for about $400 (CP9185) ... or you can buy an ALDLcable.com scanner cable for about $80 with shipping and tax and use my app on your pc for free. If you don't think it is worth it, I hope you sell the car to someone who does.
Old Oct 8, 2022 | 11:52 PM
  #28  
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Re: Vats system

Originally Posted by GaryDoug
You have a car that is "special". Unfortunately or descriptively that means it requires special treatment. You can buy a cloned Tech 2 from China for about $300 (takes a few weeks) ... or you can buy a scanner that can do some diagnostics... for about $400 (CP9185) ... or you can buy an ALDLcable.com scanner cable for about $80 with shipping and tax and use my app on your pc for free. If you don't think it is worth it, I hope you sell the car to someone who does.
what do you mean it's special?
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