Strange "thump" right after starting???
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New User
Joined: Mar 2003
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Strange "thump" right after starting???
I just purchase my first Ford truck and Diesel 2 weeks ago. I have a '00 F350 Crew, 8' bed. After starting my truck, approx. 10-15 seconds, there is a sudden "thump" that you can both hear and feel. Any ideas as to what this could be?
Any help is appreciated.
Thanks
Any help is appreciated.
Thanks
Senior User
Joined: Feb 2003
Posts: 167
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From: Somewhere out there.
Strange "thump" right after starting???
To expand upon what "gseeders" wrote, it only happens on the diesel trucks because they have a electric operated vacuum pump to supply the heating/air conditioning vent system and the vacuum hubs. I have not heard this in any gasser as the motor developes its own vacuum. I don't know what door in the plenunm box is moving to cause this. Bottom line: normal operation, although sometimes catches you off guard.
Senior User
Joined: Apr 2002
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From: Reno USA
Strange "thump" right after starting???
I too have the same "thump" just after starting. Although it dosen't happen every time I start it and sometimes its louder than others, It's seems to be normal. I posted this question here myself last year, and received similar responses. I took it to Ford, and of coarse it would'nt do it while they had possesion and they could'nt tell me anything. Now after two years of hearing it and it seems to have no ill affect, I no longer worry about it. 
Elder User
Joined: Dec 2001
Posts: 713
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From: C H I C A G O
Strange "thump" right after starting???
I too have heard this "thump' in my truck as well. The first time , it scared the hell out of me , thinking someone either hit my truck , or something fell outta it.
Glad to hear that it is "somewhat" normal.......
Glad to hear that it is "somewhat" normal.......
Postmaster
Joined: Apr 2001
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From: Baileyton, TN
Strange "thump" right after starting???
Well well well!
I wondered why the Lariat did that - the '96 makes too much noise to notice if it ever does.
I wondered why the Lariat did that - the '96 makes too much noise to notice if it ever does.
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Mountain Pass
Joined: Feb 2002
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From: Fairbanks, Alaska
Strange "thump" right after starting???
Huh? I've never heard that noise. It sounds pretty dramatic from what I am reading. So, I think if I ever heard (or felt) the thump, I'd know about it.
Steve
Steve
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Junior User
Joined: Jan 2003
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Strange "thump" right after starting???
PSD Tech, I drive a 2002 F-250 with a 5.4 and it does this. We have 3 of these super duty trucks at work, all gassers and all do it, so I think it is the design more than where the vacuum comes from.
Senior User
Joined: Feb 2003
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From: Somewhere out there.
Strange "thump" right after starting???
Mmmm, interesting. I've only noticed it on the diesels, and have not had any customers give that complaint on their gassers. I'm not saying that you are wrong. I'll try and pay more attention to it.
Posting Guru
Joined: Mar 2002
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From: Twin Cities, MN
Strange "thump" right after starting???
????
I got another one for ya. On all of our E450 buses they "do not" do this. Only my 01 does this. I think this has been covered in the past and it is possibly related to the 4X4 system.
edit: forgot to mention they are all the psd's exept for one 98 which is a v10.
I got another one for ya. On all of our E450 buses they "do not" do this. Only my 01 does this. I think this has been covered in the past and it is possibly related to the 4X4 system.
edit: forgot to mention they are all the psd's exept for one 98 which is a v10.
Senior User
Joined: May 2002
Posts: 301
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From: East Texas
Strange "thump" right after starting???
I have the 2001 psd and it is not a 4x4 and has done this from day one although it doesn't happen every time. I first wonder if I hit something or vise versa. I now have 65,000 mi without any repairs. knock on wood!!
over and out
gseeders
over and out
gseeders
New User
Joined: Apr 2003
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From: My Own Little World
Strange "thump" right after starting???
Just to give an update the 2003 7.3 still does the muffled backfire sounding thump, no driveability issues though. I was glad to see this post, thats why I came to this site, to see if I could find out what that damn noise was. First time I heard it I thought someone opened thier door into the side of my new truck and was ready to kick some butt, but when I looked around I was all alone as usual
Tuned
Joined: Feb 2003
Posts: 451
Likes: 5
From: Raleigh, NC.
Strange "thump" right after starting???
My 2002 V10 Excursion does this sometimes. Just a suttle hint of a thump is all I hear just after starting the engine in the early morning. Now that I know what it is, not worried about it.
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