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

84 will not start! help?

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Old Jun 12, 2014 | 04:16 PM
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Default 84 will not start! help?

I have a 84 that will not start. believe it has something to do with the antitheft devise. Any way to disarm or by past this thing. When you try to start car up, antitheft light on dash comes on and says armed.
Car sat for awhile outside without door handle on car.
Any advise will help. Thanks Rich
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Old Jun 12, 2014 | 05:07 PM
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Does the starter crank the engine?

We need some basic info here...
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Old Jun 12, 2014 | 05:57 PM
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some times. thought it may be fuel pump. still nothing. can't hear pump running
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Old Jun 12, 2014 | 06:02 PM
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O.K. Hook up a fuel pressure gauge, a spark checking device, and have some one crank the starter while observing spark, fuel spray from injectors, and pressure. What is missing?
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Old Jun 12, 2014 | 07:50 PM
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car now has no power. will not crank or click
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Old Jun 12, 2014 | 08:13 PM
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Get out a test light or DVOM and start checking for power.
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Old Jun 12, 2014 | 09:15 PM
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maybe the starter enable relay?
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Old Jun 12, 2014 | 09:50 PM
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Maybe. Test. Last guy on here who WAG'ed that, spent $23 on a relay, the time to change it, for nothing. Then he replaced hi$ battery...for nothing.
WAG'ing
Test.

This is easy. Do you have power at the starter motor? Lets start there...

Last edited by Tom400CFI; Jun 12, 2014 at 10:27 PM.
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Old Jun 12, 2014 | 10:04 PM
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Originally Posted by cad90hd99
I have a 84 that will not start. believe it has something to do with the antitheft devise. Any way to disarm or by past this thing. When you try to start car up, antitheft light on dash comes on and says armed.
Car sat for awhile outside without door handle on car.
Any advise will help. Thanks Rich
on my 85, you have to lock/unlock the passenger door....just a shot..
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Old Jun 13, 2014 | 03:23 AM
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Originally Posted by Tom400CFI
Does the starter crank the engine?
He asked that because the anti theft system disables the starter. It seems the problem is there. The anti theft system is armed by locking the car and disarmed by unlocking the car. Sometimes the switch on the door lock goes bad. I have heard of the system not quite getting completely disarmed because the door lock was not returned to the vertical position.

You can test the anti theft system to see if it's functional by locking the door and then opening the door from the inside. The horn should honk when you do that. My car has power door locks and one time I had the window down and didn't want to find the keys in my pocket so I reached in through the window and hit the unlock button. The horn started honking, which I didn't expect.

Originally Posted by cad90hd99
car now has no power. will not crank or click
Do other things work? The headlights, for example.

Last edited by Cliff Harris; Jun 13, 2014 at 03:26 AM.
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Old Jun 13, 2014 | 05:53 PM
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Originally Posted by Cliff Harris
You can test the anti theft system to see if it's functional by locking the door and then opening the door from the inside. The horn should honk when you do that. My car has power door locks and one time I had the window down and didn't want to find the keys in my pocket so I reached in through the window and hit the unlock button. The horn started honking, which I didn't expect.
Right. But when you then put the correct key in the ignition and turn it on, that tells the car to disable the alarm...and the car will start.

OP said car cranks sometimes,, but not now. OP said nothing about alarms sounding (horn), as would be the case if the security system were active and mot recognizing keys etc.

Testing for power at the starter is a pretty basic/easy test.
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Old Jun 14, 2014 | 02:17 AM
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Originally Posted by Tom400CFI
Right. But when you then put the correct key in the ignition and turn it on, that tells the car to disable the alarm...and the car will start.
You're thinking VATS. The car is an '84 -- no VATS. The starter disable relay is controlled by the same anti theft system that honks the horn.
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Old Jun 14, 2014 | 02:29 AM
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Originally Posted by Tom400CFI
Maybe. Test. Last guy on here who WAG'ed that, spent $23 on a relay, the time to change it, for nothing. Then he replaced hi$ battery...for nothing.
WAG'ing
Test.

This is easy. Do you have power at the starter motor? Lets start there...
I agree 199%
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