I am experiencing a loud pop/boom on startup after the truck sits overnight. When you start the truck it will idle for about a second and then, it is like a loud pressure release and then everything is fine. It only does that after it has sit overnight; also the longer you let it sit the louder the noise. I went a week before starting her and it was real loud. It sort of sounds like a flapper sticking and when there is enough pressure it blows it open loudly. Does anyone have an idea what it could be? Should I take her to the dealer?

Rob

 

Very Interesting!

The Board needs your help. Please go to https://www.f150online.com/f150board...ML/005186.html to see what the heck I am talking about.


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Jim
jim@jimshaw.cc

Black 00, Swanson Chip (Superchip re-burn is on the way), 4.10's
super whites, Airaid w/10" Big Mouth filter, chrome wheels
AIM 2" drop shackles, Mobile1 w/FilterMag, clear corners
2000 E320, 1993 Cobra R, 1959 Corvette, 1949 Plymouth Coupe

Looking for a better paying job to support my L

 

Somebody help fordsales out, after a week of vacation he's gone mad!
Anyway I get a clunk when it sits overnight from my a/c compressor. I think that's what you are hearing. I had mine looked at last year and they said to turn it off when you shut it down. They also said ( this is from the invoice)"Too much oil in AC system evac AC remove aculator an drain all oil out of system add 4oz AC oil recharge system" misspellings and all.....it still does it.
Tom

 

Mine did it also and I thought it was the a/c or a vent flap opening, so I started shutting off the a/c and vents when I turned the truck off and no more loud bang at startup.

Trace www.nloc.org

 

THANKS!
I will give it a try.

Rob