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when cold starting the engine is quiet for about 30 seconds then it rattles like a diesel until it is warm ,then it is quiet again ,I thought maybe lifters ,but if so why are they quiet at first ?
I have a 2000 Explorer w/a 4.0 OHV that has this problem. I took it in under warranty and they couldn't hear it.
Well time went by and it got worse. Eventually it would do it all the time at idle. I took it in and they de-carbonized the engine and now it only does it slightly when cold at idle. Hard to believe carbon build up would make this sound but it did.
Rezvani's Latest Post-Apocalytic 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.