Intermittent failure
 

Hello,
Big puzzle on a V6 BVA lebaron cabriolet from 1991/92
It works perfectly well when the ambient temperature is below 28 °
I made a trip of 2500 km on a week and no dysfunction.

But WHEN THE AMBIENT TEMPERATURE EXCEEDS 28/30 ° it is the forced stop after about twenty kilometers. Stop a half hour and hop it restarts for a new twenty kilometers .... and so on!

Does somebody have an idea

First thing that comes to my mind is vapor lock.

ONLY when the vehicle is driven by an outside temperature above 30 ° C but it is an injection so no vapor lock possible

Even cars with fuel injection can suffer from vapor lock. Vapor lock is nothing more than air (vapor) trapped in the fuel lines and it does not matter what kind of fuel system the car has.
On fuel injected vehicles, if the fuel lines run to close to a source of heat it can cause the fuel in the line to vaporize and you get vapor lock.
The next time it dies and won't start, take off the gas cap for a couple of minutes and try starting it again.

thanks your thinking about the power line is very interesting. I will control it.
cordially

as soon as it happens,pop the hood and have someone turn it over and check for spark,if none, the CKP, (crankshaft position sensor) their a weak link for mopars