Hello everyone,

this is about a 2014 C7 US base model that I own here in Europe. No modifications whatsoever. The problem that I have is that very occasionally the engine stops operating when the car is idling (automatic transmission in D mode, gas pedal not pushed) and rolling at low speed like when approaching a red traffic light or the end of a congestion).
It happened 4 times over the last 6 months and it is always like this:

* engine stops, cannot be re-ignited anymore. Starter is doing its best but engine wont start.
* roadside assistance is called and also unable to start. No problem with the battery, no problem with the fuel pump, no problem with the starter.
* car was then taken to the repair shop (us car / GM specialist) where they were unable to diagnose the problem because (A) there no record whatsoever about the incident in the car's computer and (B) the next morning car starts just normal as if nothing is the matter.

I have seen a very old post on here (https://www.corvetteforum.com/forums...errerid=307094) where it says replacing the engine+drive train made the problem disappear. I was unable to get a reaction from the original poster... of course it is many years ago and who knows whether he/she is still on. Also maybe in the meantime there are similar incidents that might provide some insight. Replacing the engine+drive just on suspicion without even knowing what the root cause is seems a bit... harsh to say the least.

I also want to apologize for my poor vocabulary because I am not a native English speaker and also not an expert of the technicalities.

I'll be happy to read thoughts, experiences or pointers to other people or resources that might help. One of the repair shops in my reach has given up... they tried many things and no idea anymore... I am about to transfer to another one but they told me right away that they have never heard of this behavior before, so my hopes are limited.

Thanks in advance. I'll answer any follow-up questions to the best of my abilities.

André Hartmann
Berlin, Germany

 

Even though there is no record, as long as the "crank no start" condition exists, the troubleshooting should be straight forward using any professional scan tool. Check out Diagnose Dan on YouTube. Maybe he can help you!

 

If it turns out to be a crank no start it may be fuel or ignition…also can be a crank sensor…look at your Tach and if the Tach does not move during cranking it usually points to a crank sensor…easy to diagnose but using a scope helps…bad CKP will cause the engine to quit either at idle or at speed !!

 

Willkommen!

You definitely do not need an engine if it runs fine otherwise. The fact that it stalls and will not restart but will restart when cooled off suggests some type of temperature related connection issue (as my Opa used to say, a wackel Kontact lol). The perplexing part is that no codes registered, these modern engines typically find any issue, even minor ones that may go noticed to the driver. See if your US specialist repair shop has a scan tool that can get more in depth, especially check for codes that are pending. Not sure if this is any help, sondern viel Glück!

And BTW your English grammar is above par compared to most of us on automotive forums.

 

If its the original battery you may want to replace even if it appears to have life. Lots of threads on this and cheap first step.

Also... your English is great.

 

Definitely sounds like a thermal issue -- doesn't happen at speed (because lots of air is flowing through the engine compartment), and then happens at idle (now, the engine is beginning to heat soak, though not as bad as when you shut the car off).

I would tend to agree that is probably not a battery problem.

I would guess that it is sensor-related.

Another remote possibility is that you have vapor lock. IIRC C7's do not circulate unused, pumped fuel back to the gas tank (apparently that leads to more emissions, and cars stopped doing that long ago). But again, I feel that's a remote possibility in a C7.

At a minimum, I would locate some of the more critical sensors like the crank position sensor, and re-seat each connector (assuming you know how to "unlock" the harness from the sensor in each case, some of these connectors are PITAs).

Your English is quite good.

 

^^ good suggestions in here. let us know how it goes OP new engine definitely not needed....

 

Just suggestion based on exactly the same strange problem with Mercedes (there was also no codes stored) - crank position sensor.

 

Thank you everyone who read this and responded. In 3 days the car will go to the most knowledgeable shop (Kramm) that we have here in Berlin, but they have already said that they've never had anything like this. The crank shaft sensor was one of the first things that the garage analyzed where the car was until now and that ran out of ideas. I'll pass on everything that was written here and I'll post more as I get feedback from Kramm.

A "Wackelkontakt" ... yes, that's a likely explanation but a nasty one to find I suppose.
"as long as the "crank no start" condition exists, the troubleshooting should be straight forward" ... that's part of the problem right there. Car breaks down, gets towed to the garage and the next morning when they want to diagnose it starts just fine. I fully understand when the mechanic says that it is tricky to get a grip on it when the problem doesnt show.

Until I have more... .Hasta la vista, I'll be back

 

Keep us updated good luck!

 

It is exactly what happened with my mercedes engine
when crank position sensor heated up engine stopped without any error code and when cool down after some time it started again until sensor heated up. I changed sensor to new one and problem disappeared.

 

I am currently having this issue with my car any help would be appreciated.

 

Did you ever figure this out? I am having the exact same issue.