C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

opti at 54k

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Old Nov 4, 2019 | 11:21 PM
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Default opti at 54k

my water pump went in my 96 LT4. I caught it early so I don't think the opti got wet, it only has 54k on it. Everything ran fine before.

I've got the water pump off, going to order new plug wires. My question is whether or not I should mess with the opti at this mileage or not????

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Old Nov 5, 2019 | 12:59 AM
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Open it up and inspect it is the only way to know.




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Old Nov 5, 2019 | 08:13 AM
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If thats OEM working fine, youd be dumb to replace it with anything other than OEM NOS (which isnt easy to find)
id say leave it alone if its fine inside.

inspect the seals make sure they arent cracked. put dielectric greAse on them.

test the vacuum system (it doesnt pull a lot of vacuum just a tiny amount due to the reducer).

may also put rtv silicone around the connector harness entry point and the 2 halves as a fail safe in case the oem seAl cracks.

lastly

do the water pump weep hole mod to direct leaks from a leaky water pump away from the optispark

good luck


Last edited by dizwiz24; Nov 5, 2019 at 08:17 AM.
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Old Nov 5, 2019 | 01:07 PM
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Originally Posted by dizwiz24
lastly

do the water pump weep hole mod to direct leaks from a leaky water pump away from the optispark

good luck
Can you expand on that with a link or other information? Sounds like some good proactive work to do. Thanks.
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Old Nov 5, 2019 | 05:02 PM
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At 54k and 23 years I had the optidoctor rebuild mine on my 96.
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Old Nov 6, 2019 | 12:32 AM
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Originally Posted by dizwiz24
If thats OEM working fine, youd be dumb to replace it with anything other than OEM NOS (which isnt easy to find)
id say leave it alone if its fine inside.

inspect the seals make sure they arent cracked. put dielectric greAse on them.

test the vacuum system (it doesnt pull a lot of vacuum just a tiny amount due to the reducer).

may also put rtv silicone around the connector harness entry point and the 2 halves as a fail safe in case the oem seAl cracks.

lastly

do the water pump weep hole mod to direct leaks from a leaky water pump away from the optispark

good luck

Thanks for the advice, I'll give it a whack... I took a look in Home Depot for something to drain the water from the water pump, but all the fittings looked a bit big...
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Old Nov 6, 2019 | 12:35 AM
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Originally Posted by Whaleman
At 54k and 23 years I had the optidoctor rebuild mine on my 96.


Interesting, I wasn't sure what the expected lifespan would be on these and whether many would need rebuilding at this kind of mileage. Did you get any indication that there was any problem with yours during the rebuilding process?
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Old Nov 6, 2019 | 06:07 AM
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Originally Posted by moonstation2000
Interesting, I wasn't sure what the expected lifespan would be on these and whether many would need rebuilding at this kind of mileage. Did you get any indication that there was any problem with yours during the rebuilding process?
I did not open it up before I sent it in. I did see where the coil wire connected to the opti the connection was solid yellowish thick corrosion. Both in the opti pin and the wire. Back in the day nobody would ever say," My distributer cap and rotor only have 54,000 miles so it should be good." I am 68 so when I got to the opti I wanted it done right. I am not in a giant hurry and have another car to drive. Price out a MSD cap and rotor and you

will see the optidoctor does not charge much to clean up, bead blast, install new bearing and seal the unit up with some real good sealant and TEST. Too much work for me to not have it done right.
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Old Nov 6, 2019 | 11:08 AM
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Originally Posted by moonstation2000
Thanks for the advice, I'll give it a whack... I took a look in Home Depot for something to drain the water from the water pump, but all the fittings looked a bit big...
I didn’t have to tap the weep hole since it is aluminum and I used a hardened elbow. I did however use a drill bit the same size as the weep hole to essentially clean it out and de-burr any casting inaccuracies.

I used a 90* grease fitting for the elbow since that was all Lowe’s had. Turned out to be better since it is a hardened part and always in stock. I drilled out the end and removed the inner spring and ball.

I applied a little thread sealant to the elbow threads

Took a pair of vice grips and screwed the elbow into the water pump until it stopped in the position I needed. I ran the drain hose out the passenger side as it was less obstructed and there were other hoses to attach it to.


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Old Nov 6, 2019 | 01:01 PM
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Nice simple fix. Could this be done with the water pump in the car? I know this might be an ignorant question, but I am not familiar with the layout in there ...
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Old Nov 6, 2019 | 05:08 PM
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Originally Posted by turtle96
Nice simple fix. Could this be done with the water pump in the car? I know this might be an ignorant question, but I am not familiar with the layout in there ...
I seriously doubt it.
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Old Nov 6, 2019 | 05:33 PM
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I did my weep hole mod with the water pump in the car. I got one of those double-pointed brass barbs (3/16 I think), cut one end down to 2 barbs and carefully filed that end small enough to tightly fit inside the weephole. Took a bit of arm contortion to reach under there with enough force to push it in. But it's snug in the hole and the hose is routed down to the underside of the car.
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