Optispark? The usual suspect
Thread Starter
Burning Brakes
Joined: Sep 2011
Posts: 764
Likes: 19
From: odessa FL
Optispark? The usual suspect
Mostly on the C5 forum but have issues with my 95 LT1 right now.
After sitting several weeks, the battery was stone dead. Disconnected and recharged. Following that, the engine would spin over fine but would not start. Finaly got to checking it out, now it will start, run rough and then stall, esp if I give it any throttle. Fuel pressure is good according to my gauge. No check engine lights. My code reader is with a friend who is out of town so I havent checked that yet.
By way of background the car sat for several years at a friends house who had bought it. I cleaned the tank out, flushed with fresh gas, changed the battery, oil, tires, fuel pump and repaired some wiring and vac lines that mice had chewed. Thing is, it ran surprisingly well, started right up and no issues until now. I had been driving it at least once a week until a month ago and convinced the GF we should keep it as a second car for her.
I changed the water pump ~8 yrs ago but not the optispark, its original ~116k. I suspect that and or the coil.
What things should I look at next? Codes? Any chance it is just the cap/rotor?
After sitting several weeks, the battery was stone dead. Disconnected and recharged. Following that, the engine would spin over fine but would not start. Finaly got to checking it out, now it will start, run rough and then stall, esp if I give it any throttle. Fuel pressure is good according to my gauge. No check engine lights. My code reader is with a friend who is out of town so I havent checked that yet.
By way of background the car sat for several years at a friends house who had bought it. I cleaned the tank out, flushed with fresh gas, changed the battery, oil, tires, fuel pump and repaired some wiring and vac lines that mice had chewed. Thing is, it ran surprisingly well, started right up and no issues until now. I had been driving it at least once a week until a month ago and convinced the GF we should keep it as a second car for her.
I changed the water pump ~8 yrs ago but not the optispark, its original ~116k. I suspect that and or the coil.
What things should I look at next? Codes? Any chance it is just the cap/rotor?
Safety Car
Joined: Aug 2002
Posts: 3,842
Likes: 230
From: SANTA CRUZ CA
In lieu of your code reader, you might try this:
http://tech.corvettecentral.com/2011...trouble-codes/
http://tech.corvettecentral.com/2011...trouble-codes/
Burning Brakes
Joined: Nov 2013
Posts: 914
Likes: 277
From: St. Petersburg FL
Doesn't sound like the Opti to me. As bassackwards pointed out, bad Optis throw codes.
Thread Starter
Burning Brakes
Joined: Sep 2011
Posts: 764
Likes: 19
From: odessa FL
Thread Starter
Burning Brakes
Joined: Sep 2011
Posts: 764
Likes: 19
From: odessa FL
Most electronic ignitions for me have either worked or not at all. I will try to pull codes when I get back. Check engine light is not on.
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Burning Brakes
Joined: Mar 2005
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Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Not the opti then. Tach gets its signal from the Opti. If the tach is working, not shuddering or jerking around, the opti is working. I agree w/the other suggestion to check the ICM.
It's not the 'fuel in the fuel filter"; the second you turn the key on and the pump runs, that fuel is pushed though though the system, back to tank and diluted to where it won't matter, by the fresh fuel that you put in the tank.
That and fuel doesn't go bad in a couple weeks (not years, Dr Dyno)
It's not the 'fuel in the fuel filter"; the second you turn the key on and the pump runs, that fuel is pushed though though the system, back to tank and diluted to where it won't matter, by the fresh fuel that you put in the tank.
That and fuel doesn't go bad in a couple weeks (not years, Dr Dyno)
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
But you're right, it could be a cap 'n rotor.