optispark
Le Mans Master
Joined: Mar 2010
Posts: 8,170
Likes: 17
From: Eugene Oregon
I believe in the Beer Fairy
St. Jude Donor '15,'19
Mine started missing from the water pump leaking on it, replaced both and 1 year later replaced the water pump again. This time I caught it before there was any damage to the Opti Spark, I also installed a hose on the water pump this time to reroute any leaks away from the Opti. 
Advanced
Joined: Apr 2012
Posts: 52
Likes: 0
From: Salt Lake City Utah
Snoozer sorry to hear about your possible opti spark problem. I have had some problems in the past from the opti taking a direct hit with an undercarriage spray at a car wash. that started with the car missing and then completely dying. I've seen cheap remanufactured opti sparks fail when installed on a high horse power application. This also started with the car misfiring then completely dying. Petris seems to make a good replacement opti.
Melting Slicks
Joined: Aug 2008
Posts: 2,082
Likes: 50
From: Palmdale CA
Another Option would be to inspect what you have for things like oil, grime, internal corrosion, arching and such. At least at this point you will have a better understanding of what you have, and you can make an informed decision..
Instructor
Joined: Jan 2006
Posts: 110
Likes: 1
From: Auburn NH
Couple weeks ago my 94 c4 started skipping sporadically. Then started running fine again. This weekend started skipping again. Have 116,000 miles. I assume the opti is going as I think it's the original one. Thinking of buying a petris. Whats the best water pump to buy as I will replace that at the same time?
Advanced
Joined: Apr 2012
Posts: 52
Likes: 0
From: Salt Lake City Utah
I have an electric water pump. Meziere has the best water pump on the market in my opinion. The Meziere weighs 1.6lbs heavier than some inferior brands. The reason for that is the electric motor is that much bigger. It also draws more amps. I know this from using another brand in the past. The other brand did last several years to give it credit. The electric water pumps will give you better cooling AND a little more horsepower. 5 to 10 hp more than your original mechanical set up. The part number for the Meziere through summit is WP118HD $268.09 and free shipping. You can check eBay also and maybe get it a few bucks cheaper. Good luck!!
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Advanced
Joined: Apr 2012
Posts: 52
Likes: 0
From: Salt Lake City Utah
Couple weeks ago my 94 c4 started skipping sporadically. Then started running fine again. This weekend started skipping again. Have 116,000 miles. I assume the opti is going as I think it's the original one. Thinking of buying a petris. Whats the best water pump to buy as I will replace that at the same time?
Melting Slicks
Joined: Aug 2008
Posts: 2,082
Likes: 50
From: Palmdale CA
Couple weeks ago my 94 c4 started skipping sporadically. Then started running fine again. This weekend started skipping again. Have 116,000 miles. I assume the opti is going as I think it's the original one. Thinking of buying a petris. Whats the best water pump to buy as I will replace that at the same time?
Advanced
Joined: Dec 2012
Posts: 89
Likes: 0
From: CARPI ITALY
My C4 1994 two years ago sometime started skipping with only Km 58000.
There was a little water leak from the pump and the optispark go bad like my english !!!
I have changed water pump and opti with OEM parts. ROBERT
There was a little water leak from the pump and the optispark go bad like my english !!!
I have changed water pump and opti with OEM parts. ROBERT