QUOTE(Boomingbeetle @ Nov 10 2016, 11:33 AM)
When I was turning wrenches at the neighborhood auto shop, we frequently needed to drive customers cars, or go get parts with them, or bring them home (if we had a secure place to park them, which was better than at the lot...) The issue is when someone complains that the car "runs funny" or "acts up" or "makes a noise at 37mph when the engine has been started 4 times during 80% humidity below 54-degress F"... A lot of the time driving a car is needed to diagnose the issues, my $.02
How true. I had a mech years back in Austin that had a customer with a car that kept getting towed in as it died on the same street every time but not every time she drove on that street. He finally kept the car for a couple of weeks and drove it to/from work every day along that street. Finally happened to him only to discover it was some EMF at the airport that would disable the ladies ECU occasionally.
Not sure how he discovered that but according to him she quit using that route and it never happened again.