95 Vette won't start
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Joined: Feb 2013
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95 Vette won't start
Bought it a couple weeks ago & ran fine. Had the engine steam cleaned & ranRough for a few days, then Ran fine again. drove it one day, then the next changed the thermostat went to start it & nothing. It try's to Start but just can't get there. Replaced the fuel pump thought that might be it but still nothing. Today I replaced the ignition module, but still nothing. Also there is no fire from the module to the coil.
Any suggestions on what I can check before towing this thing in? I don't have access to scan it for codes so I need to do this old school if possible. I'm out of ideas right now.
Any suggestions on what I can check before towing this thing in? I don't have access to scan it for codes so I need to do this old school if possible. I'm out of ideas right now.
Last edited by Elmer Soriano; Feb 2, 2013 at 07:36 PM.
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From: Fort Hood Texs
Have you checked the ignition fuse in the fuse box on the inside 10 amp fuse the opti spark should be send a signal out if that goes bad it wont I recommend reading a little on this site about them. I had put a new one and it was defective. If you washed the engine good chance water got in it. Not claiming to be an expert newbie to the vette world but this build has shown me about everything thay can go wrong will go wrong.
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Fuse was good. I just went ahead & ordered a new opti spark. Hopefully that is it, guess I will know in a few days. I will post what the outcome is. The wife has banned me from steam cleaning anymore of our cars lol
Intermediate
Joined: Dec 2012
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From: Fort Hood Texs
Tuned but might want to look at changing wires same time. Make sure you hook up vacum lines before you install pain to do after.
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Joined: Oct 2012
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From: Huntsville AL
While waiting for the manuals to arrive, you can search here and learn how to pull codes using a paperclip and the driver information center buttons. The codes appear on the speedometer display. Pulling codes would have pointed you towards the Opti problem instead of making a $300 guess.
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Sorry haven't been on here it was an after market one. She ran fine for awhile, then this weekend she did the same thing. Not sure if it went out again or not. Same exact symptoms as before, I checked & there is power going to it just like before... So at this pont I'm frustrated & puzzled. My nephew has a Z06 & he was telling me I may have a short somewhere that is causing this. I don't know where to even start looking for this short.
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I checked power at the ignition module while the key is in the on position.
I haven't haven't checked the opti spark power yet, plan on checking it tonight when I get hime.
Getting power to the pink wire when key is on
Haven't checked for moisture yet, but there shouldn't be any anywhere, it has been hot out.
I haven't haven't checked the opti spark power yet, plan on checking it tonight when I get hime.
Getting power to the pink wire when key is on
Haven't checked for moisture yet, but there shouldn't be any anywhere, it has been hot out.
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From: Austin TX
Just a thought.. Couldn't you use a timing light to determined a failed Optispark? What I am saying, if your timing light is throwing a consistent flash, even when just turning the engine over with the starter, you have determined the ignition coil, ICM, and Optispark is working. If it doesn't throw a light or throws a constant light, something in that chain is not working. Right? I would like to see an argument on that point..
Have you checked your fuel system with a pressure gauge to determine if the fuel pump is failed? Have you changed out the fuel filter/water separator to determine if you have bad gas or water in the fuel? The fuel pump is easy to replace in your car.
Considering alcohol soaks up moisture from the air, water in the gas is a big possibility. All pump gas is 10% Ethanol. I recently went through the gas situation on my 92. I got bad gas which coincided with an intermittent fuel pump that totally resembled an Optispark failure. When I removed the fuel filter/water separator, this rusty looking fluid came running out. But I used a timing light to determine that my optispark was working and timing was consistent. Just saying..
Have you checked your fuel system with a pressure gauge to determine if the fuel pump is failed? Have you changed out the fuel filter/water separator to determine if you have bad gas or water in the fuel? The fuel pump is easy to replace in your car.
Considering alcohol soaks up moisture from the air, water in the gas is a big possibility. All pump gas is 10% Ethanol. I recently went through the gas situation on my 92. I got bad gas which coincided with an intermittent fuel pump that totally resembled an Optispark failure. When I removed the fuel filter/water separator, this rusty looking fluid came running out. But I used a timing light to determine that my optispark was working and timing was consistent. Just saying..
Last edited by mixalive; Apr 29, 2013 at 04:18 PM.
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From: Fort Hood Texs
Just a thought.. Couldn't you use a timing light to determined a failed Optispark? What I am saying, if your timing light is throwing a consistent flash, even when just turning the engine over with the starter, you have determined the ignition coil, ICM, and Optispark is working. If it doesn't throw a light or throws a constant light, something in that chain is not working. Right? I would like to see an argument on that point..
Have you checked your fuel system with a pressure gauge to determine if the fuel pump is failed? Have you changed out the fuel filter/water separator to determine if you have bad gas or water in the fuel? The fuel pump is easy to replace in your car.
Considering alcohol soaks up moisture from the air, water in the gas is a big possibility. All pump gas is 10% Ethanol. I recently went through the gas situation on my 92. I got bad gas which coincided with an intermittent fuel pump that totally resembled an Optispark failure. When I removed the fuel filter/water separator, this rusty looking fluid came running out. But I used a timing light to determine that my optispark was working and timing was consistent. Just saying..
Have you checked your fuel system with a pressure gauge to determine if the fuel pump is failed? Have you changed out the fuel filter/water separator to determine if you have bad gas or water in the fuel? The fuel pump is easy to replace in your car.
Considering alcohol soaks up moisture from the air, water in the gas is a big possibility. All pump gas is 10% Ethanol. I recently went through the gas situation on my 92. I got bad gas which coincided with an intermittent fuel pump that totally resembled an Optispark failure. When I removed the fuel filter/water separator, this rusty looking fluid came running out. But I used a timing light to determine that my optispark was working and timing was consistent. Just saying..