MY 2004, SUPERCREW WITH THE 5.4 HAS A LITTLE CLATTER WHEN IDLEING, A LITTLE LIKE A DIESEL. HAS ANYONE ELSE NOTICED THIS.

 

Two years ago, I took my company F-150 4.2 v6 back to the dealer because the rear tire hanger had failed (luckily I was on the jobsite and not the freeway), and I asked the service manager to also tell me why the truck sounded like a diesel. I had taken over the truck with 27K miles on it, the dealer had done all of the oil changes at 3K intervals, and now had 31K miles on the truck.

He called me back to tell me that the main thrust (?) bearing was bad, and Ford replaced the engine...

Good Luck!


James

 

It's been my personal experience that when these Ford and GM's four cycle V8's start sounding like a diesel they may have piston slap. Plenty has been written on this topic at this web site.

 

ALL CAPS IS YELLING!
I do believe it may be piston slap.