93 C4 died
Thread Starter
7th Gear
Joined: Mar 2019
Posts: 7
Likes: 0
93 C4 died
New to vette world and forum. I have a 93 LT1 40th anniversary vette. Never had any trouble but LOTS of fun driving. Today went out n the vette ran good until it started run very rough n died. If I let it sit awhile it would start n get me a few miles before dieing again. Took me awhile to get home. Any idea what the issue can be?
Last edited by Jkruszyn; Mar 10, 2019 at 04:26 PM.
Thread Starter
7th Gear
Joined: Mar 2019
Posts: 7
Likes: 0
Not yet just occurred today and wasn't sure where to begin. It will start and run for a few miles, so assuming not fuel, when it is running it will run smooth for a few miles. Not sure what would cause it to suddenly die.
Burning Brakes
Joined: Feb 2013
Posts: 769
Likes: 95
From: Central Pennsylvania
I don’t want to be the bearer of the “big O “ bad news, but both my Lt 1’s ( a 92 and a 93 Ruby ) both exhibited those exact same symptoms as they were circling the drain. Then died completely.
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Le Mans Master
Joined: Sep 2009
Posts: 6,341
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From: Vermilion OH
The first thing I would personally check for is spark to and from the optipsark unit. This checks the coil and ignition control module as well as the opti. This would be a good place to start as the optispark has a moderate failure rate. Most every LT1 owner will experience replacing one or having theirs replaced at some point. In addition to this, of course, a fuel pressure test would be in order and it can't hurt to scan the ecu for stored codes. Keep us updated with what you find.
Thread Starter
7th Gear
Joined: Mar 2019
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I completed the paper clip method to locate any codes. In Mod 4 I received H16 and H36. From the search I completed, it looks like a bad opti like everyone had mentioned. Looks like I have to replace the opti and might as well change water pump.
This forum has been extremely helpful and looking forward to getting the 93 Back on the road.
Thanks to All!
This forum has been extremely helpful and looking forward to getting the 93 Back on the road.
Thanks to All!
Race Director
Joined: Oct 2011
Posts: 16,091
Likes: 819
From: Dallas Texas
2025 C4 of the Year Finalist - Modified
Good job on learning how to scan the codes
They will give codes with: H or C in front of the numbers. H is for history, C is for current. When the car dies, connect noid light to any fuel injector connector. No pulsing when cranking=bad opti.
They will give codes with: H or C in front of the numbers. H is for history, C is for current. When the car dies, connect noid light to any fuel injector connector. No pulsing when cranking=bad opti.
Last edited by 1993C4LT1; Mar 11, 2019 at 08:06 PM.
Melting Slicks
Joined: Aug 2018
Posts: 3,127
Likes: 86
Melting Slicks
Joined: Aug 2018
Posts: 3,127
Likes: 86
That is also good to know. Thanks for posting.
