Join Date: Sep 2008
Location: Fruitland Park,Florida
If you want to properly diagnose the optical part of opti, buy a $70 pc based oscilloscope. You can get one on Ebay, Amazon, etc. With it you can see if low & high resolution pulses are present. And of the proper square waveform. A must have tool if you own a lt1 car.
If you test opti and find you need a new one, stay away from part store, & cheap import opti. With these 2 types, you have a 50-50 chance of it being bad right out of the box. Then if your lucky enough to get one that works, you then have a 50-50 chance of it failing within several thousand miles.
Do yourself a favor and buy only GM, Delco, or Delphi opti. They are no picnic, but are the best of a sorry lot.
If you doubt opti can fail suddenly, yes it can like any other electrical part. The icm is a part that usually gives warning they are going bad. But I've seen a bunch of them go bad suddenly with no sign of failure.
Same with the electric fuel pump. They usually show signs of failure. But can also die without warning.
The bottom line is; don't be a parts changer. You can run tests to see if opti, icm, or other parts are bad. If your installing a new water pump, drive a plastic fitting into the weap hole. Silicon around it. Attach tubing to fitting and route it away from opti. That way if wp springs aleak from seal failure, opti won't get a bath.
Last edited by cocobolo95; 11-22-2018 at 06:59 AM.