No start / No spark troubleshooting (Page 2/2)
Duck Hunter 117 JAN 23, 02:01 PM

quote
Originally posted by Whuffo:

No voltage on either wire: bad fusible link.



I am having this problem with my 88GT but it will start after being hooked up to a battery charger for ~10min. The battery is good, had it tested. What is the "fusible link" I should be looking for?
americasfuture2k JAN 23, 06:28 PM
got anything for the DIS systems? im haveing some "no spark" issues right now. ive been looking everywhere for a flow chart. nada so far.

i did just win a GM Ignition System Operation & Diagnostic Manual off ebay. so i know this is going to help. good find, and i wasnt even looking for it!

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86GT3.4DOHC JAN 24, 09:17 AM
The DIS system is fundamentally the same, but a little simpler.

The Crank Posistion Sensor (CPS) has replaced the PUC, but still acts the same and performs the same functions.

To test a CPS, just check for AC voltage between the two pins while cranking. Voltage means its good, flatline means its bad. Its signalling right off of castings on the crank, so theres no 2 ways about it (other than bad wiring)

The DIS module (ICM) is very simple. Just feed it 12v, ground, and CPS signal and it will spark.

So confirm you have 12v and ground to it, confirm the CPS is outputting AC voltage, and take all the plug wires off and crank. You should be able to watch the spark jump from tower to tower in sequence. If any one coil isnt firing, its painfully obvious. If none of them are firing, I would take the module in to be tested and plan on buying a new one.
As far as the car only starting on battery charger, Im gonna go with the battery has to be bad, or you have a bad connection that is being remedied by the charger. If you had a blown fusable link, then its blown, and theres no way for it to ever work again until its replaced. And think about it, all you are doing with the battery charger is forcing more power into the battery, thats not going to effect anything else.

So, its either got to be the battery doesnt have the power to crank the engine, or there is a bad connection and the battery doesnt have the power to overcome the resistance AND crank the engine under its own power. OR you are changing something, wiggling something, when you connect the charger.
Duck Hunter 117 JAN 24, 02:52 PM
I have a brand new ICM in the car, so I know that portion is good. Is there a way to test the 4-pin connector that attaches to the ICM to read the voltages with the ignition on? To make sure the ICM is getting power?