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

Vats?

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Old May 18, 2008 | 08:39 PM
  #1  
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Default Vats?

Hello,

my C4 left me stranded at a shopping mall yesterday. wonderful... !

Got back into the car to go home, lots of cranking of the motor happening, but not on your life would it start.? .. towed home

I just want to be sure I am on the right track with identifying the problem.

The fuel pump is silent when I turn the ignition key, and there appears to be no spark getting to the plugs. The engine will crank over fine, and there is plenty of power in the battery.

Is this the VATS system immobilizing the car? The symptoms sound similar to the situation I seen described in other posts, but I wanted to be sure.

I've tried starting the car again a number of times in the past 24hrs, and there is no change. No response from the fuel pump etc.

many thanks

Last edited by f104g; May 18, 2008 at 08:58 PM. Reason: update
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Old May 18, 2008 | 08:43 PM
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It would help if you told us what year your car is. A Vats problem will not allow the car to crank at all. Your problem is fuel or spark in orientation.
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Old May 18, 2008 | 09:31 PM
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VATS won't allow cranking when it is defective or doesn't detect the correct resistance in the ign key pellet. Measure the fuel pressure at the shrader valve on the end of the fuel rail. It should be about 40 psi. During cranking, use a timing light or pull a plug wire and bring a grounded wire within 1/2 inch of the plug wire end. The timing light should flash, there should be a nice fat spark to a plug wire.
I also vote for posting what year C4 you are asking help for. No one on this forum is clairvoyant.
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Old May 19, 2008 | 03:27 PM
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What year is your C-4?
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Old May 20, 2008 | 07:48 PM
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Originally Posted by dzierke
What year is your C-4?

Hi .

I have a 1986 coupe, and yep, as I stated before, there is no spark either at the spark plugs.

Last edited by f104g; May 20, 2008 at 07:51 PM.
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Old May 20, 2008 | 10:01 PM
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It's not VAT. When the VATS system is active it won't crank?
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Old May 21, 2008 | 01:23 AM
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you can try searching for the testing procedure for no spark, its been said before x1000. so go for it or buy a FSM
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