Backfire or pop!
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New User
Joined: Mar 2007
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Backfire or pop!
I have a 2002 f250 crew cab V10. Sometimes right after I start the engine I get a pop or thump that is heard through the passenger firewall. I had one guy tell me it was a coil. How can I tell?
Coaler.
Coaler.
Postmaster
Joined: Nov 2001
Posts: 4,742
Likes: 8
From: OK
Sounds like it might be the vacuum-operated blend door in the heat/AC system on the passenger side of the truck (behind the glovebox).
Vacuum leaks off overnight and the door opens up. When you start the truck and vacuum is re-applied, the door slams shut making a loud "thump" noise. Completely "normal" for that era of truck.
Vacuum leaks off overnight and the door opens up. When you start the truck and vacuum is re-applied, the door slams shut making a loud "thump" noise. Completely "normal" for that era of truck.
Mountain Pass
Joined: Sep 2006
Posts: 227
Likes: 0
From: Wyoming
Originally Posted by Monsta
Could also be a midget with a hammer that you wake up when you start the truck.
Try taking the hammer away.
NoMo, as usual, is spot-on.
Try taking the hammer away.
NoMo, as usual, is spot-on.
Oh, I really needed a good laugh this morning, Monsta! Thanks man!
Junior User
Joined: Sep 2007
Posts: 68
Likes: 1
From: Washington
Originally Posted by NoMo
Sounds like it might be the vacuum-operated blend door in the heat/AC system on the passenger side of the truck (behind the glovebox).
Vacuum leaks off overnight and the door opens up. When you start the truck and vacuum is re-applied, the door slams shut making a loud "thump" noise. Completely "normal" for that era of truck.
Vacuum leaks off overnight and the door opens up. When you start the truck and vacuum is re-applied, the door slams shut making a loud "thump" noise. Completely "normal" for that era of truck.
Normal
