I recently reinstalled my 383 Stroker motor and was breaking it in. The car for about an hour and died. The car will not start now, it will crank and sometime backfire when cranking. The Opti is fairly new. I am getting spark from the coil but not from the spark plug wires. The fuel pressure is fine. Is there any tests that can be done on the wiring harness that plugs into the opti itself? Is there tests that can be done on the ignition module that will determine the problem. I am assuming that one of these things is the problem. Anything else anyone can thing of? Any help would be greatly appreciated.

 

if you are getting spark at the coil then the module is more or less ok. However they are known to fail when warm. are you gettng spark AT the opti? IE through the coil wire? all the opti will do is distribute the spark to the cylenders. it seems that the imputs from the opti are ok since the coil is fireing but you might have a problem with the internals

 

I checked the coil wire at the end it plugs to opti and it is sparking. Plug wires are not sparking. I didn't know if something could be wrong with the ignition module and the coil will still spark? Could there be something wrong with the 4 pin wiring harness or output of the harness that plugs directly to the optispark? If there is something wrong will this will it cause no spark from the spark plugs?

 

as far as I can think having just woken up.... the plug carrys ground, 5 volt refferences and inputs from thelow and high res signals and should not have anything to do with the acual spark distrubution. if you are getting sark then low res signal should be ok there for the plug should be ok. When I wake up more I might be able to think better but it would look lke you have a problem inside the opti.


The module accepts the signals from the opti and translates that into a verying ground system to fire the coil and if it is firing then it is fine

 

Your not getting spark through the opti. That is purely a distribution problem. Has nothing to do with resolution signals from the optical encoders. Could be the rotor is faulty and is not contacting the plug wire connections. You gotta pull the opti apart. Even if you were to look at the valves and see they were not moving indicating the cam is not turning, you still got to pull the opti apart.

 

Ok, I will pull the Optispark. Of course I wa trying to get away from this. I just put the motor in so I guess it isn't going to seem like a big deal. I just wanted to verify that if spark is going into the opti and not coming out then it is something internally wrong with the optispark (which makes sense).

What are the wires in the harness that plug to the opti actually doing?

Thanks!

 

Reference voltage, ground, Hi-resolution and low resolution signal.

The low resolution is used for firing order and cam position. Without it, the PCM will not fire the injectors, ICM or the fuel pump. It signals the PCM at 4 times per crank revolution.

The hi resolution is used for crank position and without it the PCM will store DTC36 but the engine can still run. This signal is 360 pulses per crank rotation.

Go here
http://shbox.com/1/95_ign_system_schematic.jpg
to find the wiring.