Can someone please tell me why when 2008 ford f150 truck idles for about 5 minutes on grass the next day there will be dead spots of grass where ever truck was idling at.This happened 3 or 4 different places I had parked truck and left idling. Thanks for the help

 

Welcome to the site.

Fuel bleeds/drips, any smell at/on the dead spots? Coolant etc. need topping off? Exhaust isn't altered, turn downward?. Unless the grass is tall, the converter or trucks is low, heat from the exhaust shouldn't be an issue. Truck is on the lawn for detailing or ? Dog in the back of the truck to long ;-)