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93 C4 died

 
Old 03-10-2019, 04:25 PM
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Jkruszyn
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Default 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; 03-10-2019 at 04:26 PM.
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Old 03-10-2019, 04:45 PM
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billschroeder5842
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Welcome to the Vette world!

Before I jump and yell "opti-spark" I'll ask if you had a chance to do any baseline checking. Fuel pressure, spark...etc?
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Old 03-10-2019, 04:50 PM
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Jkruszyn
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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.
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Old 03-10-2019, 06:44 PM
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skyhawk50
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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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Old 03-10-2019, 07:03 PM
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1993C4LT1
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First things first, check to see if any codes sre stored. No need for a scanner. Look up:how to scan codes 1993 corvette. Do that, report back.
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Old 03-10-2019, 07:08 PM
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vette196
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Stock? Non-vented opti?

Last edited by vette196; 03-10-2019 at 07:08 PM.
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Old 03-10-2019, 07:09 PM
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Will check code and get back to all.
Thanks for helping.
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Old 03-10-2019, 07:10 PM
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All stock parts.
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Old 03-10-2019, 09:41 PM
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JimLentz
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Could also be an ECM issue.
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Old 03-11-2019, 06:27 AM
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mazdaverx7
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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.
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Old 03-11-2019, 10:01 AM
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Lots of good suggestions and I'll work on all. Might not be till next weekend, but will let everyone know the results.
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Old 03-11-2019, 06:17 PM
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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!
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Old 03-11-2019, 08:06 PM
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1993C4LT1
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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.

Last edited by 1993C4LT1; 03-11-2019 at 08:06 PM.
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Old 03-11-2019, 08:21 PM
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Jkruszyn
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I believe local auto parts store will loan a mood light set. Thanks I will make that my next task. If I need the opti any advantage to upgrading from stock? If so which brand?
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Old 03-13-2019, 05:10 AM
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ZHammer
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Originally Posted by billschroeder5842 View Post
Welcome to the Vette world!

Before I jump and yell "opti-spark" I'll ask if you had a chance to do any baseline checking. Fuel pressure, spark...etc?
This is good advice.
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Old 03-13-2019, 05:11 AM
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ZHammer
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Originally Posted by 1993C4LT1 View Post
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.
That is also good to know. Thanks for posting.
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Old 03-13-2019, 05:50 PM
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1993C4LT1
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I would go with an AIP opti. Sac City corvette, a vendor here sells them.
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Old 03-13-2019, 06:06 PM
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I vote Optidoctor
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Old 03-13-2019, 06:46 PM
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Originally Posted by vette196 View Post
I vote Optidoctor
i put in a Petrie been doing great

Last edited by kimmer; 03-13-2019 at 06:48 PM.
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Old 03-13-2019, 11:18 PM
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1993C4LT1
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Can't go wrong with the top 3 choices.
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