Volkswagon starts only in the morning
I have a 1991 Volkswagon Cabriolet. Summer car, not much used but reliable for the last number of years.
This year, it will start in the morning, run for about 5 minutes then stop. Will turn over after that, but will not start. Try to start anytime during the same day , it will not start.
Leave it to the next morning, car will start again, but repeat.
Changed ECT sensor, checked fuel pump relay., checked grounding of wiring, problem not solved. Last sensor I haven't checked is Oxygen sensor, haven't located it yet.
Any help is appreciated.