1994 audi 100 no restart when warm some times.new crank sen, and diffrent ignion modle.
Do you checked the petrol filter? It can be simple as that.
check the MAF, the spark plugs and cabling, air filter, petrol pump.
I had the same problem with mine (same year, same model), I cleaned all the air intake system, fuel line, and now it's perfect (even needing to change petrol filter, i didn't changed it yet). Careful cleaning the MAF, if you don't know how to do it don't do it, ask an expert near you.
If you can't solve the problem this way, search for air or fuel leaks.
I solved mine cleaning the fuel line and the air intake system.
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When my car is warm I have to wait till it cool down a litle bit, and I have to turn the key several times to start again, but if I leave it for several hours it will start perfectly
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