Need advice, replacing opti
Thread Starter
Instructor
Joined: Dec 2011
Posts: 200
Likes: 18
From: Boise Idaho
Need advice, replacing opti
So my water pump went out on my 94 base model a couple weeks ago. Replaced it this weekend, and in doing so, drop the damn thing right on the optispark wiring connection. Was praying for a miracle that it wasn't damaged and wouldn't you know it, got a secondary missfire on half the plugs. So now the question is what to replace it with? I've heard nothing buy horror stories of using anything aftermarket. Seems the only ACDelco's left are remaned, and they get crap reviews. Delphis are still around, but don't know much about them. Anyone have a suggestion?
Race Director
Joined: Mar 2015
Posts: 15,926
Likes: 579
So my water pump went out on my 94 base model a couple weeks ago. Replaced it this weekend, and in doing so, drop the damn thing right on the optispark wiring connection. Was praying for a miracle that it wasn't damaged and wouldn't you know it, got a secondary missfire on half the plugs. So now the question is what to replace it with? I've heard nothing buy horror stories of using anything aftermarket. Seems the only ACDelco's left are remaned, and they get crap reviews. Delphis are still around, but don't know much about them. Anyone have a suggestion?
Safety Car
Joined: Aug 2002
Posts: 3,842
Likes: 230
From: SANTA CRUZ CA
Do some research on the opti sold by SacCityCorvettes. I've replaced 4 NOS (ACDelco), so I'm not
recommending NOS after my experiences. Using the SacCityCorvette opti now.... so far, so good.
recommending NOS after my experiences. Using the SacCityCorvette opti now.... so far, so good.
Last edited by Tact; May 9, 2015 at 11:04 AM.
Thread Starter
Instructor
Joined: Dec 2011
Posts: 200
Likes: 18
From: Boise Idaho
Last edited by Tact; May 9, 2015 at 11:05 AM.
Safety Car
Joined: Aug 2002
Posts: 3,842
Likes: 230
From: SANTA CRUZ CA
I checked them out and their stuff looks decent. I did notice that there is only a 1 year warranty on their stuff though. Honestly, at this point I'm just going to grab a Duralast or A1 Cardone from Autozone. They both come with lifetime warranties. So, they'll either work or I'll become the worlds most efficient Opti and water pump replacer.
You may have read the following link.... a very detailed and popular opti instruction:
https://www.corvetteforum.com/forums...-pictures.html
Flatulent Dwarf
Joined: Nov 2009
Posts: 729
Likes: 84
From: Poverty Holler NC
So my water pump went out on my 94 base model a couple weeks ago. Replaced it this weekend, and in doing so, drop the damn thing right on the optispark wiring connection. Was praying for a miracle that it wasn't damaged and wouldn't you know it, got a secondary missfire on half the plugs. So now the question is what to replace it with? I've heard nothing buy horror stories of using anything aftermarket. Seems the only ACDelco's left are remaned, and they get crap reviews. Delphis are still around, but don't know much about them. Anyone have a suggestion?
later, tiny
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Thread Starter
Instructor
Joined: Dec 2011
Posts: 200
Likes: 18
From: Boise Idaho
You may find ( as I did ) a slight difference in the pigtail coupling where it connects near the starboard side fuel rail in the new Opti. Not a big deal, as the actual wiring is the same. The difference was in the plastic watertight connector. easily fixed with a sharp knife by removing the alignment tab inside. I used a rebuilt Opti from GM Mexico....so far no problems. Oh....and you don't have to remove the center bolt on the crank pulley to get it off, just the three on the perimeter of the pulley.....don't ask how I know.
later, tiny
later, tiny
Instructor
Joined: Nov 2013
Posts: 154
Likes: 1
I've had a $104 dollar rock auto unit in mine for a few thousand miles now. Still running perfectly, just took it to the track a few weeks ago shifting at 6k for 7 passes. Ran a 13.71 best on a close to stock 6 speed with 2.1 best 60fts very little traction. So I'd say that optis holding up.
Flatulent Dwarf
Joined: Nov 2009
Posts: 729
Likes: 84
From: Poverty Holler NC
Replaced to Opti and a lot of other stuff in September. Except for picking up some funky gas I've had no problems with the car. Took a ride up to Richmond VA for the Zip Corvette customer appreciation day a couple of Saturdays ago....about three hours one way for me, no problems.
Make damn sure you put the vent hose back on before you put the crank pulley back on....you will cuss if you don't.
later, tiny
Make damn sure you put the vent hose back on before you put the crank pulley back on....you will cuss if you don't.
later, tiny
Race Director
Joined: Sep 2001
Posts: 14,678
Likes: 751
From: NEwhere Ohio
In 01, i paid top dollar $630 for an ac delco nos opti base (sans cap). I added a custom vent to it and 30k later, a user here is using it in his c4 after i sold it and converted to gen 2 parts.
The ac delco remans, yes they are po$. I had an issue with a gen 2 reman that didnt work out of the box. Middle finger to gmpartsdirect for selling me that pos and then charging me restock fees/ battle it out with credit card company.
Melting Slicks
Joined: Jul 2011
Posts: 2,605
Likes: 202
From: Trinity FL
I think this is the best Opti on the market right now for Gen 1 Opti replacements. My two other choices would be Sac City and MSD. Petris is great to deal with, I called my order in and spoke directly with Chris Petris.
Le Mans Master
Joined: Dec 2000
Posts: 5,761
Likes: 47
From: munising MI USA
just changed mine out to a petri too. Hopefully they hold up. Looks like a quality unit.
Burning Brakes
Joined: Jan 2003
Posts: 931
Likes: 3
From: Portland OR
I'd even like to get a used Opti (even dead) that I could swap internals with.
Took the three bolts off the crank pulley, not sure how much banging it will take to loosen it.
Race Director
Joined: Mar 2015
Posts: 15,926
Likes: 579
Put a bit of antiziese on it for next time And pull your knock sensors out to get a proper flush a bunch of crap settles there.
Last edited by antfarmer2; Jul 6, 2015 at 01:41 PM.
Burning Brakes
Joined: Jan 2003
Posts: 931
Likes: 3
From: Portland OR
It won't start with the broken opti wires but it could turn over. May try that as a last resort.