This popping sound is driving me crazy. It's somewhere in the exhaust...probably near the manifolds. It begins within a few seconds after I start the truck, and it continues to "pop" well after the engine is shut off (as it cools down). It's loud. It's annoying. It just sounds "cheap".

Does your truck do this?

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'99 S/C 4.6l 10k miles. Stock everything.
TexasDude

 

My truck has started to do the exact same thing, from the same place. Anybody know why?

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'99 F-150 XLT SC 4x4 5.4L Auto 3.55LS Tow pkg, skid plates, keyless entry, UWS tool box, Superchip, Gibson pipes w/ Flowmaster 40 series muffler, K&N filter

 

I had the same type of thing with mine. If it sounds like water being boiled off of hot metal, then your AC condenser drain line is dropping water on the hot heat shield above the exhaust. I had my dealer reroute the line. The other sound I had was like a baffle had come loose inside the muffler and it popped and crackled like crazy. I had the dealer replace the muffler and the noise went away for a short while. 600 miles later and it was back in the same place. I decided to live with it and it has diminished over time.

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2000 F-150 XLT Sport, Silver 4-door Supercab StyleSide
Short Bed (Only way to fit in the garage)
17" Sport Wheels with BFG tires, 3.55 R, 4.6l V8, Auto (First one in 20 years)
In-Dash Single CD Player, 60/40 Split bench dark graphite

Mods So Far
K&N Filter, Gatorback Spray-In Bedliner, Llumar ProShield Window Tint
WMS Velocity Tube, Black Westin Step Bars

Future Plans
Superchip, Upgraded Speakers/Stereo
FlowMaster Exhaust