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a ball peen hammer on a stainless pan I would say, about as close as I can say, or at least from the times I have heard it.
A hollow metal taping sound kind of, somewhat high pitched, that may actually depend on size of combustion chamber and area on surface of pistons and what not.
Sounds like a handful of BBs in the cylinders...I should know. My truck does nothing BUT ping. I gotta get a break on weather, so I can hook up with my buddy the Ford tech and get her re-timed...
The best possible description I can give is, it sounds like a big rattling Cummins. mine was really bad until I switched to midgrade gas, now its completely gone, and I get better gas mileage.
BTW, midgrade around here is 87, not 90 like the rest of the country.
Mine pings from time to time if I use a lower grade of fuel.If what you are refering to is spark knocking.It does kinda sound like a Cummins engine now that I think of it,real bad on the big hills.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.