87, No spark unless scanner hooked to ALDL - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

 
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post #1 of 4 (permalink) Old Nov 25th, 01, 12:03 PM Thread Starter
 
Join Date: Nov 2001
Location: Groton, CT USA
Posts: 3
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Here's my problem.

'87 Camaro 383 TPI MSD Distributor with stock external coil.

The car usually starts. On those days it doesn't here are the symptoms.

Cranks, oil pressure builds (as expected). No spark. If the scanner is attached to the ALDL, or some pressure exerted on the ALDL it starts.

I am baffled that a bad connection at the ALDL can prevent a spark. I even disconnected the computer from under the hood, and it wouldn't start.

I have no trouble codes at all.
Disconnecting the battery and waiting a minute or two doesnt do anything either. I replaced the cap/rotor and the external coil. nothing...

anybody have an idea? would appreciate it. its a fun car when it works.
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post #2 of 4 (permalink) Old Nov 25th, 01, 05:05 PM
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Joe
 
Join Date: Aug 2001
Location: san jose ca usa
Posts: 503
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Check the computer ground and power supply.

------------------
70 camaro 307 (350soon) /350th
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post #3 of 4 (permalink) Old Nov 26th, 01, 04:15 PM
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Join Date: Aug 2001
Location: Lafayette, TN, USA
Posts: 34
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If you've got a key with a chip on it, it may be something in the theft deterrent system wiring. That's just a stab but may be worth a thought. I'm not sure if the theft deterrent kills the spark or kills everything.
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post #4 of 4 (permalink) Old Nov 26th, 01, 07:09 PM
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Join Date: Oct 2001
Location: milw,wi,usa
Posts: 159
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The 'vats'system which is the key with the resistor in it only shuts off the fuel injectors.I've worked on tons of fuel injected vehicles and have never seen what your describing?Not doubting it mind you just never heard of the data link connector causing a no spark condition.I guess I don't have an answer with out actually 'seeing' this in person.Sorry
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