RoperC4

My stuff has gone wack.

If I purchase this is this all I need?

http://store.summitracing.com/partde...5&autoview=sku

Any better deals? Im new into c4 and straight into a bad optispark.

JD'S WHITE 93

It is a good idea to change the waterpump while you're at it. If the waterpump starts leaking it can destroy your opti. The msd unit looks real nice but I have no first hand experience with it. I replaced mine with a AC Delco unit for around $300.00 Good luck and if you get stuck
we can help.

RoperC4

I can get an accel optispark for 240. Should I go that route?

RacerX70CC

MSD is the better unit... you have PM, btw

clf93lt1

stay away from accel opti.

cicch95

Change the water pump. There used to be a guy around here from a...hmm...Superior Chevrolet I think...Chris maybe. He used to give forum members great deals on the pumps. That's where I got mine. Hopefully someone will chime in with his info.

There is a good article in the tech tips section on installing these items! I do not have any experience with the MSD unit, as I replaced mine with a stock unit and modified it to accpet the vacuum tube. The picture of the MSD shows the tube inlet. However, be sure that if it is year specific it actually has that option!!!!!

Good luck!

-Rick

jaa1992

Just did the waterpump & opti on my 92.

Replace the waterpump while you are in there, ya gotta take it off anyway. Cheap insurance. I went to the Dyanspark for 2 reasons: track record, active venting. Yea its $600+, but once you get everything apart you probably don't want to do it again for a real long time.

Also check your serpentine belt, if its a two sided belt and missing chunks get a new one from NAPA. Replace your tensioner.

Also while you have it all apart consider replacing plugs and wires. It was not too difficult to do them with everything apart.

I wound up doing the opti, water pump, plugs, wires, o2 sensors, and egr and she runs like a new car.

RoperC4

Thanks alot you guys. How much did it end up costing you doing all that at one time? I wouldnt mind doing it. I can smuggle 600+ for that opti if i must but might just do the stock one along with all the other things you listed. Sure would be nice to get the performance back and enjoy that supercharger.

jimg's'93

Let's spend some more of that $....why not go with a Meziere hi-flo water pump while you're in there

BlackbirdZ07

Definitely replace the waterpump at the same time, since a leaking waterpump is a sure way to kill your new optispark. It's also well worth replacing the three oil seals while you're in there... crankshaft, waterpump shaft, and optispark shaft. I believe those are the three.

RoperC4

Jeeze, this is getting complicated. I wish I just had a link to all parts i need and a total. Then I can do the work myself. I gotta see how much money to hustle up.

BlackbirdZ07

Check out tld-corvette.com for great prices on AC Delco parts and great service. Their online catalog isn't complete but they'll have everything you need if you call.

dizwiz24

I was also new into a creampuff 26k 1993 and also into a bad optispark.

I replaced with a custom vented cap from a later model optispark (95-96) and a replacement 92-93 optispark unit.

At 50k, there are no issues with the spark.

I would go dynaspark due to its unique design and proven track record.

If you dont have the cash, go like I did with an OEM unit and later model OEM vented cap (you'll have to rig in some vacuum fittings - no biggie).

I would NOT go MSD or accel. Many of their products (MSD Digital 6 plus and MSD 8.5mm wires -that spark arc'd brand new) are garbage.

MikeC4

if you can find better prices than "thepartsladi", then go for it... I have used these guys for a bunch of parts for my '93, they ship fast, and you can call them on the phone and they are real nice folks...

$288 for GM 1993 PART# 10457702 OPTI SPARK NEW AC DELCO

http://search.stores.ebay.com/Thepar...346802QQsofpZ0

Road Agent

Stock is fine.

dizwiz24

I caution you on this, there have been a few issues of Meizere water pumps fuses blowing, wiring melts, etc. for some forum members where I remember hearing stuff about warped heads and stuff like that.

Although most people seem to have no problem.

Z06_BluByU

For that kind of money I would be looking into the opti-spark eliminator kits (someone help me out with this one).. I think its called a DTCC modification or something.. it basically useds the clapped out opti carcass as just a crank trigger and uses caddy coils to fire the spark.. This seems to be a very reliable system..

if thats too high tech.. I would go along with the others and recommend a dynaspark if you dont want to go for the stock unit.. for what MSD gives you 515.00 is outrageous!!! to advance the timing you use a new chip (programming) not some knucklehead advance screw crap..

I have 174k miles on my C4.. 136k of which I have personally put on it over 10 years.. I have put on two optisparks in that time and both have been the non-vented stock 1993 deals that I got for around 250.00 each.. thats 70k miles (and counting) apiece - this includes the one i replaced for the hell of it while I was building the stroker motor.

Desert1957

I like this set-up to replace the Opti.

http://www.delteq.com/opti_pricing.htm

Desert

RacerX70CC

Most of these types of failures can likely be traced to improper installation, use of undersize wiring, etc. typical of a DIY install. Use of a relay would go a long way in rectifying any potential problems with excessive current draw. I relay ANY high-current devices, electric water pumps, nitrous system and purge solenoids, etc. It's not rocket science, just common sense.

Getting back to the OP's problem, though... You should replace the water pump when you do the Optispark, as you're already in there anyway. The expense is minor compared to replacing the pump and Opti later (though I've still not heard of any water intrusion failures for the MSD units). Better safe than sorry, plus you do the job only once.

You do NOT have to replace the front crankshaft seal unless you want to (I wouldn't unless it's leaking...don't fix what's not broken), and you don't have to pull the hub to get the Opti off, so why bother it if it's not leaking? If it is leaking, then I'd recommend replacing it, but it's your call.

Good luck in whatever you decide...

Akcelr8 N VA

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