Mudduck

So it's happened twice now. first time a few weeks back and then this morning. I have an '07 5.4 with 43k on it. At low rpms, while driving, foot barely on the pedal, thump. It almost feels like a shift but gears are not changing. Thump, and then maybe 10 seconds later, thump. Then that's it.


It's not a ticking or knocking, just a minimal thump.


Any thoughts?


Thanks in advance!

Longcut

Was your defrost or AC on when it happened? Could be your compressor kicking in and out. I can here mine on my 2010 if the radio is off or down.