Inside the optispark
Thread Starter
Heel & Toe
Joined: Nov 2018
Posts: 17
Likes: 0
Last edited by 95’er; Nov 6, 2018 at 06:10 PM.
Race Director
Joined: Oct 2011
Posts: 16,085
Likes: 819
From: Dallas Texas
2025 C4 of the Year Finalist - Modified
What brand opti is that? Looks the first opti I took out of my 93. Sometimes you can't tell they are bad by visually looking. Sensor could be bad. On one of mine, if you spun the rotor by hand, it would wobble. Which putting a new one and the car ran fine.
Racer
Joined: Jul 2017
Posts: 259
Likes: 38
From: Volcano CA
Mine ran great but had a wiggly bearing so i replaced it with an AIP unit. I cleaned and swapped in my Mitsu sensor. All is well and I have the new AIP sensor as back stock.
Main thing is don't bolt it down if it's not perfectly flush with the timing cover. Ask me how I know. Also, fire it before you put on the water pump. Will save you hours of headache.
Main thing is don't bolt it down if it's not perfectly flush with the timing cover. Ask me how I know. Also, fire it before you put on the water pump. Will save you hours of headache.
Safety Car
Joined: Apr 2016
Posts: 4,648
Likes: 1,059
From: N.E. Ohio OH
Finalist 2020 C4 of the Year - Modified
don't forget, the oem ones can be rebuilt, upgraded and use the mitsubishi sensor. if you price the cost of an MSD cap and rotor ($150.00 plus depending on source) then the rebuild service is not too bad all considering what you get
https://www.ebay.com/sch/berrington1...p2047675.l2562
https://www.ebay.com/sch/berrington1...p2047675.l2562
Thread Starter
Heel & Toe
Joined: Nov 2018
Posts: 17
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Racer
Joined: Mar 2018
Posts: 432
Likes: 128
Don't give up just yet. I know a no start condition can be frustrating, but that is not unique to a C4. That's a pain in the **** on any car. You'll simply have to go down the list of possible culprits, one by one. Don't throw tons of cash at it, troubleshoot each component. Check fuel pressure, injectors, fuel pump to start. Heck, check your battery even! It could be providing enough current to crank, but not enough to start. Rare, but it happens. Check the cables too, including ground points(those can cause all sorts of hell on any car). Just start with the easy stuff, and work your way towards the pain in the neck stuff.
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Drifting
Joined: Oct 2015
Posts: 1,674
Likes: 191
From: Shit Creek, USA
What lead you to the Optispark as the cause in the first place? Did you test all the easy stuff first? I will be one of the first to cuss the bloody Optispark, but swapping that mother when it was really the coil/ICM/fuel pump etc. instead is painful and unsatisfying.
Press on. If I can keep an LT-1 running, anybody can.
Press on. If I can keep an LT-1 running, anybody can.
Thread Starter
Heel & Toe
Joined: Nov 2018
Posts: 17
Likes: 0
What lead you to the Optispark as the cause in the first place? Did you test all the easy stuff first? I will be one of the first to cuss the bloody Optispark, but swapping that mother when it was really the coil/ICM/fuel pump etc. instead is painful and unsatisfying.
Press on. If I can keep an LT-1 running, anybody can.
Press on. If I can keep an LT-1 running, anybody can.
as if one of the spark plugs was out was causing static then I put my hand on the Opti had a buddy crank it and recieved some voltage from it so figured that was it I done changed almost everything except the ignition control module ....
Thread Starter
Heel & Toe
Joined: Nov 2018
Posts: 17
Likes: 0
no spark from wires module 4 reading err when I jump the odb port but had computer replaced already reflashed for my vin had it send to dms corvette shop in garland he told me after I got my bcm repaired it should fire right up still same issue he had his tech 2 on it at the shop it ran fine until you unplug it and turn the car off then same symptoms would apply I think he 42 faked me but I expected that after he tried to get me for 1500 on removing the bcm when I pulled it myself in 30 mins shipped it off had it repaired by g7computers amazing company but I’m going out this morning to put on a new icm and track down some wires
Racer
Joined: Jul 2017
Posts: 422
Likes: 53
From: PA
If you're getting zapped when you hold the distributor the wires are bad or the cap is cracked. I don't care how screwed up the distributor is inside, if it's leaking enough voltage to shock you wires and/or cap are bad.
Thread Starter
Heel & Toe
Joined: Nov 2018
Posts: 17
Likes: 0
I changed the whole unit no spark coming from unit at all coil firing though
Racer
Joined: Jul 2017
Posts: 422
Likes: 53
From: PA
If the coil is firing, the ignition system is working. ECM sending signal to ICM I believe. If you're not getting spark out at the plugs there's a break in the coil wire or the rotor in the distributor is messed up.