I'm going to start off by saying I have no clue what it could be, but I would listen to Bill. Did the dealer say specifically what they have checked? By saying everything has been checked that makes me think the dealership told you they checked everything but in reality they just checked the "common" culprits. If you even recommend to the dealership to "hey check this because some guys on the forum said this could cause the issues" chances are the the dealership will blow you off and say "don't trust everything you read on the forums." I know because that's what my dealership has told me when I inquire about some things.

Bill knows his stuff and I would at least ask one of the various dealerships if they tested the ignition switch, and how exactly they tested it. Chances are, if they did, they said, "yup it cycled so ignition switch is fine."

The fact is the dealership doesn't know every nuance about these cars. They know quite a bit based on the service manual but that only covers so much. They swear the recall fixes the column lock, but as we know it doesn't do squat. Same with the ignition switch.

All I'm getting at is that don't trust the dealership "checked everything" because I can bet they probably wouldn't think an ignition switch could cause a missfire symptom.

 

It's like they say...
The cheapest part of owning a Corvette is buying it
Hopefully they can fix your problem
Keep us posted

 

I thought the EBCM system retarded the timing under traction control slippage !!!!

 

lol, sorry but sounds like you bought a lemon. Mine has had zero problems in the 18 months and 13k miles I have driven it.

 

Maybe I'm dead wrong, and I'm certainly no high level vette tech, just a longtime enthusiast layman, but that just doesn't sound right based on what you've said is going on with your car. I'd still, if you haven't already had it done, have that ignition switch checked as per Bill Curlee's suggestion. If Bill is right it could save you a lot of money and continuing aggravation and disappointment. Best wishes and hope your problem is resolved soon.

 

I called to ask about it and they claim it was checked at well said no voltage drop....

 

I know it does not seem like it now but it will be worth it when it's done. I believe the cost of repairs is part of the reason a very nice car that looks almost new with great performance can be had for such a reasonable purchase price. I won't tell you what I have spent, but I will give you a clue. Replacement parts and upgrade mods include: ebcm, pcm, rear gears, transmission, torque converter (twice), balancer (twice), motor, supercharger, marker lights, full exhaust(twice), headers, gauge pod, torque tube couplers(twice), more I can't think of, now a lot of it had to do with the supercharger but not the computers.

FYI mine had a miss after the supercharger was installed on new motor, it was intermittent and was going to be sorted out by the tuner because my mechanic could not figure it out, no codes!, many on the forum did not think it was the tune, because it was intermittent, when it finally made it to dyno, it was not missing but the final tune would not load into computer, so they had to replace pcm to load the tune and the problem never occurred after that? It may have been tune but I don't really know? Seems it probably was the computer when it got hot.

Sorry you are having trouble but the car will be worth it when done.

 

If I were you I'd try a new ignition switch as suggested..you got a lot invested why throw it all away??

My C5 needed a new Trans 3 days after I bought it (GGrrrrrr)....8 mos later had to dump 3K to bring the motor up to par. It's a Vette sweetie, we pay to play. My '99 now runs fine at 225K....don't give up.

 

Whos Cindy lol Im just driving it for the moment it has only done it once n the past week so its been the least of my worries...

 

Please don't ask. lol

 

Her name is Ashley !!!!!!

 

Sorry Ashley us old guys get them damn brain farts..!!!!

 

I guess this is more a question to Bill Curlee or akapounder, in other words, to forum members who have a whole lot more knowledge on C5 electrical systems than I, which is admittedly very skimpy indeed! So here is the question. Is there any possible way Ashley's come and go miss problem could be associated with a loose or corroded ground? Maybe I missed it but I don't recall that particular point being brought up. If it is a possible, it would be another item to look at and check off the list. Keep at it Ashley! Best wishes to all!

 

I am not any where near Bill in the knowledge of the C 5 ???? I have a a lot of GM service tech experience and have a near Photographic memory so with the time I have spent here I have learned a lot !!!! I am also blessed with a lot of common sense, which to me always helped in fixing things. Back to the issue the grounds are a trouble area, I read here a few posts after they did headers or engine swap it would not run or miss and they did not hook up the wire correctly at the starter ???

 

Thanks for the reply, you always seem knowledgeable and helpful to me, sure do appreciate and enjoy your input on the various topics in this forum. Maybe at some point some forum member will hit on the right fix for Ashley and get her onto a trouble free road. Thanks again and best wishes!

 

Absolutely it could be a bad ground but, the car just SHUTTING OFF momentarily and NOT setting any DTCs kind of points more towards an ignition switch issue.

For the engine to just QUIT what it is doing and then NOT have DTCs, ,,,,,it has to be something that makes the PCM/BCM think that you turned it OFF just like you would with the KEY.

 

My wife's car (not a Corvette) would sporatically cut out momentarily. I thought it might have something to do with the ignition. It turned out to be the fuel pump. Do fuel pump or fuel pressure issues show up as codes on the display?

 

Hi Bill, thanks for the response, as usual always enlightening! I think Ashley said she had the ignition switch checked, but I don't know if she had it replaced. If it were me I'd just replace it and solve the problem or at least get it off my possible cause list. Hope you're reading this Ashley! Thanks again Bill for your time and expertise, Best wishes to all!

 

Bill you have talked about the Tech 2 showing miss fires, is there something else that the Tech 2 is capable of concerning this issue or we really are all in the dark because we don't know what has been looked at ??

 

LOL!! The TECH 2 is the tell all know all,,,,,,, If you know what to look at and how to set it up to monitor specific modules, it can tell you a whole LOT!!!!

You can data log a whole lot of different parameters and see what's screwing up.

FUEL PRESSURE.. NO,,, There are not any fuel pressure direct related DTCs. Fuel pressure just doesn't make the engine TURN OFF and then back on. When you run out of fuel pressure, you get that "keep pressing the accelerator peddle" feeling as it slowly bleeds pressure off and the engine sputters to a halt.

But like you stated... EVERYTHING was checked!

Bill