C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old Dec 10, 2009 | 11:37 PM
  #1  
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I followed the inst to bypass the vats from the web page for my 87 and it worked for 1 day, the next day it would start but shut down immediatly even if you stomp the gas...What did I do?

Please Help
Sincerely
Brent
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Old Dec 11, 2009 | 01:04 AM
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Originally Posted by my87spfdmo
I followed the inst to bypass the vats .... even if you stomp the gas...
What mod did you do ; the resistors?
With EFI if you hit the gas when cranking you shut off the fuel
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Old Dec 11, 2009 | 01:38 AM
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Default vats

It was the start enable relay bypass, it was fine yesturday today turn the key and it starts but its like it runs out of gas. Fires right up but shuts down.
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Old Dec 11, 2009 | 06:57 AM
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Originally Posted by my87spfdmo
It was the start enable relay bypass, .
What was your reason for doing the relay bypass?
It sounds like you have a VATS problem;
VATS has two parts; it disables the starter and also takes out the fuel injectors
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Old Dec 11, 2009 | 09:04 AM
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Your to harsh on VATS! the only problem with the system is the wires on the tumbler. I replace my tumbler set about every 3 years and have never had a problem with the vats system. It is a high wear item that does need changing every now and then face it. I bought my 97 camaro new and it has had 3 new tumbler sets in it and has never given me a problem with no start conditions, I believe the vats in it is the same as what C4 vettes had (correct me if I'm wrong) looks like the same passkey my 90 vette has at any rate.

While my changing the tubler set every 3 years isn't because it has had problems I just had it done to keep the system from having problems. For what VATS is it does a good job of keeping a thief with a hammer and screw driver from taking the car and with preventative maintenence it shouldn't ever give you trouble.
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Old Dec 11, 2009 | 11:37 AM
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once the ecm gets signal from vats to enable, the ecm will remain in 'run' mode even if vats signal cuts off, until 'key off'...check voltage on white 'signal' wire to ecm pin B6 with 'key on' (running or not), will be abt 2.5vdc if vats is happy, 5.0vdc or 0 vdc indicates problem.

as your car cranks and fires up momentarily, appears vats is happy.

Last edited by redrose; Dec 11, 2009 at 11:41 AM.
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Old Dec 11, 2009 | 12:21 PM
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It would start sometimes and sometimes not, and got worse over the last couple weeks.
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Old Dec 11, 2009 | 04:30 PM
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FIRST step with any efi engine is check fuel press...test kit from harbo fright for under $20.
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Old Apr 25, 2019 | 11:38 AM
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Originally Posted by jeffp1167
Your to harsh on VATS! the only problem with the system is the wires on the tumbler. I replace my tumbler set about every 3 years and have never had a problem with the vats system. It is a high wear item that does need changing every now and then face it. I bought my 97 camaro new and it has had 3 new tumbler sets in it and has never given me a problem with no start conditions, I believe the vats in it is the same as what C4 vettes had (correct me if I'm wrong) looks like the same passkey my 90 vette has at any rate.

While my changing the tubler set every 3 years isn't because it has had problems I just had it done to keep the system from having problems. For what VATS is it does a good job of keeping a thief with a hammer and screw driver from taking the car and with preventative maintenence it shouldn't ever give you trouble.

How much does that cost to replace the tumblers? Sounds like I'd rather do that than trying to mess with those electronics
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Old Apr 25, 2019 | 12:05 PM
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Looks like O'Reilly will sell it to your for somewhere between $29 and $109.

Lock Cylinder
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Old Apr 25, 2019 | 05:13 PM
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You know you can just get a dongle with the proper resistor value, unplug the wire from the cylinder on the column and plug it in and you've eliminated the column and key from the mix. You can even use a no resistor key if you like and the car won't know the difference. Best thing with the dongle it's all plug-and-play so you can return it back at any time and not have anything modified.
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