1985 Nissan 720 Pick Up spontaneously caught fire after it had been parked for three hours. background: had some electrical funniness like the window sometimes not going up. However, it was checked by a mechanic and everything was sound. Five days before this fire happened I had the underside and the engine cleaned at our local car wash. They washed it with a power hose and something a little gentler. We had some problem with the brake fluid hose and the power steering hose and it made a big mess under the engine and around the brakes etc. Also I forgot to put the oil cap on so the engine was also dirty. The mechanic who replaced the hoses said to have it washed as it was too dirty to check for other leaks.
My husband says its my fault because I should have asked him if he wanted the motor cleaned. He would have done it himself. Did the cleaning cause some kind of shortage that caused the fire. People who witnessed the fire said it sounded as though the starter was turning over. It was probably trying to escape LOL. Unfortunately, the truck will going to a salvage yard ;(