I replaced my Opti-Spark and water pump a few months ago with remanufactured
units from Napa. I paid around $350 for the Opti parts and was very
meticulous while doing the job.
This weekend, I pulled the stuff off again to have a look at it ( due to
codes pointing me in that direction ). Sure enough, the Opti was all rusted
up inside and the cap portion had some really strange looking corrosion
around the contacts. The corrosion isn't like anything I've ever seen, it's
really thick, very nasty looking stuff.
Never without a plan, I had a new GM unit on the bench ready to install.
So, for those of you out there doing Opti replacements with After-Market
parts, how did you seal the thing up? I used Silicone Gasket Goop to seal
the edges between the distributor, the "spacer", and the cap. The vent in
the cap was sealed as well.
Is it possible that I sealed moisture inside, causing the rust? Was the
Silicone a bad idea?
I suspect the Blue ATV used as a sealant is the cause of the strange
corrosion, but the rust is a bit of a mystery.