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#103219 - 12/06/01 12:25 PM Technical question for C4C5 Specialist...........
Arisa Offline
Member

Registered: 11/30/00
Posts: 204
Loc: Backwoods town called Monroe. ...
On the Optispark.....

Does the fine resolution go high during the open "window" or the closed "window" of the internal photodisk or does it pulse high on the edges ? Also where does the ECM pick up which cylinder to fire next. I assume the crank sensor, if so where exactly is it located at.

Engine in question is a 96' LT4.

Thanks

Neal
_________________________
96' Arctic White LT4


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#103220 - 12/06/01 10:05 PM Re: Technical question for C4C5 Specialist...........
c4c5specialist Offline
Member

Registered: 07/10/01
Posts: 1612
Loc: conn
Hi there,
GREAT TO HEAR FROM YOU. Now, down to business.
It basically works like this. You optispark has 2 separate systems for photo-optical sensors.
1, called the low resolution has the lower number of slots, on the inside circumference. This is the critical part of the ignition, as the PCM relies on this, and the crankshaft position sensor to correctly meter fuel.
The high resolution signal is a 1 slot for every degree of rotation.
Your crankshaft position sensor is located in the front timing cover, at the bottom, behind the balancer.
As for the spike pattern, you are looking for a 5 volts square wave, however, I do not know for sure when the wave goes high or low, in light, or no light.
What exactly are you experiencing, and we can proceed.
Besttoyou, c4c5 hammer
_________________________
c4c5 Chevrolet dealership mechanic, ASE Master Technician w/L1. COFFEE ADDICT. A persons judgement is only as good as the information they have, which should be FACT, not fiction.


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#103221 - 12/07/01 08:16 AM Re: Technical question for C4C5 Specialist...........
Arisa Offline
Member

Registered: 11/30/00
Posts: 204
Loc: Backwoods town called Monroe. ...
Thanks for the reply! Are there any papers I can get my hands on that cover the Opti in detail. Also will degreeing the cam take the Opti out of alignment?

Mine is working fine (right now). I am designing an interface to the Optispark system for some future "upgrades" !!! laugh

Neal
_________________________
96' Arctic White LT4


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#103222 - 12/13/01 09:49 PM Re: Technical question for C4C5 Specialist...........
c4c5specialist Offline
Member

Registered: 07/10/01
Posts: 1612
Loc: conn
Hi Neal,
Well, yes, degreeing the cam will effect the timing, as the Optispark is driven directly from that cam sprocket.
Detail papers are usually only in Service manuals, and I do not have anything else but the training manual I bought about 4 years ago, on LT class engines.
I will look around, and see what else I can come up with.
Besttoyou, c4c5 hammer hammersbackbuttired
_________________________
c4c5 Chevrolet dealership mechanic, ASE Master Technician w/L1. COFFEE ADDICT. A persons judgement is only as good as the information they have, which should be FACT, not fiction.


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