C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Changed the plug wires, now the engine won't crank

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Old 04-04-2024, 11:10 AM
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Gasnmyveins
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Default Changed the plug wires, now the engine won't crank

It's a 94 six speed. The radio comes on, the fans come on, the lights work. Nothing at all happens when I turn the key. No cranking. Not even the clicking that a low battery would give. Nothing.
Edited to show that it's a 94 six speed.

Edit: To save everybody time, I'll just post the solution. It seems that even 11.7 volts can prevent one of these cars from cranking. Easy solution to what could look like a big problem.

Last edited by Gasnmyveins; 04-07-2024 at 06:13 PM.
Old 04-04-2024, 11:20 AM
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Tunedport90
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Im
assuming it’s 86 or later ? Have you tried to bypass the starter enable relay?
Old 04-04-2024, 11:29 AM
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Gasnmyveins
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I'm sorry. I forgot to mention that. I've edited it to show that it's a 94 six speed.
Old 04-04-2024, 11:41 AM
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If it ran before the you changed the plug wires, you may have inadvertently bumped a connector while doing the work. If the fans and radio work you are getting power to the fuse box at least. Do you hear the fuel pump run when you first turn it to start? Check all the connectors in the engine compartment that you may have bumped to see if they are loose.
And the most important question is do you have the FSM so you have the electrical schematics to troubleshoot if needed?
Old 04-04-2024, 11:51 AM
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Gasnmyveins
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The battery is at 11.8 volts, so that's not it.
Old 04-04-2024, 11:53 AM
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Gasnmyveins
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The only thing I can think of is that maybe I disturbed something when I removed the driver side inner fenderwell next to the battery. Could that be it?
Old 04-04-2024, 05:07 PM
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There is a fuse box along that inner wheel well and a lot of connectors on the firewall and near the battery, check to see if you disturbed something. Do you have a multimeter and can you troubleshoot from an electrical schematic? Did you possibly jar the clutch pedal position switch inside the car?

Old 04-04-2024, 06:35 PM
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Originally Posted by Gasnmyveins
The battery is at 11.8 volts, so that's not it.
try to jump it anyway
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Old 04-04-2024, 10:58 PM
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Gasnmyveins
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Thanks for all the advice. I would have replied earlier, but I was on the road for 4 or 5 hours. I came to see my dad and stepmom before they go back north for the summer. Nice trip, and it's nice to be here with them, too. When I get back tomorrow, I'll be able to take a look at it and hopefully find something easy to fix. 👍
Old 04-05-2024, 06:36 PM
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solar88
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Originally Posted by Gasnmyveins
The battery is at 11.8 volts, so that's not it.
11.8 volts on a standing battery might not be enough to crank the engine. If you had the hood open for a long time and the accessory lights were on, then you might have drained the battery. Either try jumping it, or put a charger on it at 6 amps for a couple hours and try it.
Old 04-05-2024, 06:56 PM
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Clutch in all the way?
Old 04-05-2024, 09:18 PM
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Originally Posted by Gasnmyveins
The battery is at 11.8 volts, so that's not it.
that is a very low voltage for a car battery
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Old 04-06-2024, 12:39 PM
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kael
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Originally Posted by randallsteel
that is a very low voltage for a car battery
Seconded! A full 12V battery should read 12.7V with no load. 11.8 says way too low.

Recommend getting it load tested.
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Old 04-07-2024, 03:38 PM
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It's not that it just doesn't crank, it doesn't do anything. No click from the solenoid. Nothing. I'd think that with 11.8 volts, it would at least click or make some sign that I had turned the key, wouldn't it?
Old 04-07-2024, 03:44 PM
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What's this?
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Old 04-07-2024, 06:11 PM
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Well, I guess I'm just way too old school. I've had (on non-computerized cars) batteries with 10 or even 9 volts start the engine. Sluggishly, and with the issue in doubt, but it's happened for me. Anyhow, I jumped it from our van and it started. Unbelievable.

I remember before I bought the car. I said that I would probably have a lot of issues for a while. And by the time it was trustworthy for long road trips, I'd know the car inside and out. This is one of those learning times. I had no idea the car would be so sensitive to a 1 volt drop.
Thanks for all of your help. I'm really happy to have it running. Now I just have to find the vampire hiding in there.
Old 04-07-2024, 07:20 PM
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That engine has a 10.5:1 compression ratio. It takes more volts for the starter to turn it over than a car with 8:1 compression ratio.

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Old 04-07-2024, 08:56 PM
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Originally Posted by SloJo
That engine has a 10.5:1 compression ratio. It takes more volts for the starter to turn it over than a car with 8:1 compression ratio.
Right, but it wasn't even trying to crank. Nothing. I guess the computer needs the voltage to be at a certain level to work. IDK. I just know that I definitely learned something today.
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Old 04-09-2024, 08:10 AM
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Sure you didnt just have bad connections at the battery and or the grounds to the engine? If you had nothing at all, but a jump worked, sounds to me bad connections at battery. 11.8 should have done something, not nothing at all.
Old 04-10-2024, 10:59 AM
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Originally Posted by FostersPerformance
Sure you didnt just have bad connections at the battery and or the grounds to the engine? If you had nothing at all, but a jump worked, sounds to me bad connections at battery. 11.8 should have done something, not nothing at all.
I know, right? The connections are good, though. I've gone through and checked ground and battery connections recently, troubleshooting other issues. (My radio works now. That was a nice fringe benefit) The battery is also only a few months old, so there is zero corrosion. Everything is tight. It's just very bizarre to me. But I'll take it. My car is running again, and I'm having a lot of fun with it.

Last edited by Gasnmyveins; 04-10-2024 at 03:08 PM.


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