Sounds like muffled backfire upon startup!
Thread Starter
|
New User
Joined: Dec 2004
Posts: 3
Likes: 0
Sounds like muffled backfire upon startup!
01 F-250 with V10 and 69K.
Have what sounds like a muffled backfire from under firewall/tranny area or firewall/passanger side floorboard area upon startup. My son describes it as someone hitting the floorboard from underneath the truck pretty hard. You can feel it through the floor.
Started some time ago, and is an intermittent problem. Only happens once and about a second or two after initial startup. You get one noise and that is it. Does seem to happen only when it truck has set a while (several hours or days). Has happened a dozen or so times, and I used to think it was when I turned on the AC compressor. Well it is now colder and not using AC (selector is on vent so compressor is not engaged) and it still does it.
Dealership looked at me real strange, even left it two nights and they could not reproduce the problem. Again is a sporadic problem. I am mechanically inclined and generally can figure out what the heck is wrong, but this one has got me stumped! No CEL!
Any and all help or suggestions would be welcomed.
Thanks in advance for your help@!
Brad
Coppell, TX
Have what sounds like a muffled backfire from under firewall/tranny area or firewall/passanger side floorboard area upon startup. My son describes it as someone hitting the floorboard from underneath the truck pretty hard. You can feel it through the floor.
Started some time ago, and is an intermittent problem. Only happens once and about a second or two after initial startup. You get one noise and that is it. Does seem to happen only when it truck has set a while (several hours or days). Has happened a dozen or so times, and I used to think it was when I turned on the AC compressor. Well it is now colder and not using AC (selector is on vent so compressor is not engaged) and it still does it.
Dealership looked at me real strange, even left it two nights and they could not reproduce the problem. Again is a sporadic problem. I am mechanically inclined and generally can figure out what the heck is wrong, but this one has got me stumped! No CEL!
Any and all help or suggestions would be welcomed.
Thanks in advance for your help@!
Brad
Coppell, TX
New User
Joined: Dec 2004
Posts: 7
Likes: 0
My 03 PSD is doing the same thing. I've owned it for about a month and have heard it 3 or 4 times. Like blandis said " it only happens on start up and its not all the time." Is anybody else having this issue. Does anybody know what it is? All the help is greatly appreaceicated.
Hotshot
Joined: Aug 2002
Posts: 12,679
Likes: 15
From: BC, Canada
Next time you park the truck turn the heater to the off position before you switch the ignition off. See if the noise is still there the next morning. If it's not then what you're hearing is normal. It's the heater blend door slamming shut.
Elder User
Joined: Jun 2001
Posts: 775
Likes: 0
From: Northern Va
Originally Posted by Racerguy
Next time you park the truck turn the heater to the off position before you switch the ignition off. See if the noise is still there the next morning. If it's not then what you're hearing is normal. It's the heater blend door slamming shut.
Try installing a 1000 watt sound system and crank it. After a while, you will be deaf and that "thump" sound won't bother you anymore.
(Hey, it works for the import guys, right???)
Thread
Thread Starter
Forum
Replies
Last Post
rmgreenwood
Cooling, Heating, Ventilation & A/C
13
Apr 14, 2023 12:39 PM
119er
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
10
Mar 5, 2014 06:32 AM
nlindelldc
1999 - 2003 7.3L Power Stroke Diesel
8
Jan 13, 2009 11:19 PM
dieself3502001
1999 - 2003 7.3L Power Stroke Diesel
5
Sep 5, 2004 09:55 AM
