Thump After Start?
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Laughing Gas
Joined: Apr 2002
Posts: 1,007
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From: Newport News
Thump After Start?
Ok Y'all, I'm stumped on somethin here...When I fire up my truck, doesn't matter if the engine is hot or cold, it makes a thump that is felt more so than heard. It happens about 5-10 seconds after it fires up, and I can feel the thump through the floorboard, so I wonder if it could be the transfer case(Why I wouldn't know...)? I checked the hubs and they're in Auto and have been there since I got the truck. I have no idea what this is...any ideas?
basstardo
2002 F-250 Lariat, SC LB, PSD, 6-Spd, 4x4 OR, Line-X Liner...more to come...
Senior User
Joined: Nov 2001
Posts: 205
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From: Chicopee USA
Thump After Start?
[updated:LAST EDITED ON 07-Jul-02 AT 08:16 AM (EST)]My 2002 truck does it too but my 2001 did not. No clue what it is it's a mystery. To me it sounds like some vaccum operated device opening or closing.
Chuck
2002 F250 SC 4X4 XLT 5.4 Auto Dark Shadow Gray
Chuck
2002 F250 SC 4X4 XLT 5.4 Auto Dark Shadow Gray
Postmaster
Joined: Nov 2001
Posts: 4,742
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From: OK
Thump After Start?
Ahhh, the legendary climate system THUMP. Sadly, this is a normal occurance. Try a search for thump and you should come up with various thoughts & "solutions" to deal with this feature. 
Senior User
Joined: Aug 2001
Posts: 322
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From: woburn,mass USA
Thump After Start?
My truck does the same thing.It is the climate control.It scares the crap out of the wife,im just used to it.
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Senior User
Joined: Apr 2002
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From: Stratford, CT
Thump After Start?
Mine does the same exact thing. I always wondered what it was. Is it a problem or potential problem. I can live with the thump, just don't want it to lead to something down the road.
2002 F-350 Crew Cab Lariat Short Bed 4x4, V10, 4:30 LS, Black w/ Med. Parchment Leather, Off-Road Pkg, Snow Plow Prep pkg, Heated Captain's Chairs, Towing Pkg, Privacy Glass, Rear Sliding Window, Power Telescopic Trailer Tow Mirrors, Auto Shift-On-The-Fly, Fog Lamps
Mods: Westin Nerf Bars, Front Side Windows Tinted, Bed-Liner, Tonneau Bed Cover, 16x10 Mickey Thompson Classic II Rims (not installed yet)
Future Mods: 6" Skyjacker Suspension Lift & 315/75 R16 BFG Mud-Terrains (coming soon), 1" Track Bar...
2002 F-350 Crew Cab Lariat Short Bed 4x4, V10, 4:30 LS, Black w/ Med. Parchment Leather, Off-Road Pkg, Snow Plow Prep pkg, Heated Captain's Chairs, Towing Pkg, Privacy Glass, Rear Sliding Window, Power Telescopic Trailer Tow Mirrors, Auto Shift-On-The-Fly, Fog Lamps
Mods: Westin Nerf Bars, Front Side Windows Tinted, Bed-Liner, Tonneau Bed Cover, 16x10 Mickey Thompson Classic II Rims (not installed yet)
Future Mods: 6" Skyjacker Suspension Lift & 315/75 R16 BFG Mud-Terrains (coming soon), 1" Track Bar...
Junior User
Joined: Mar 2001
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Thump After Start?
[updated:LAST EDITED ON 08-Jul-02 AT 05:59 PM (EST)]Yeah, I beat my head against the wall with this one a year or so ago. NoMo's right, just search on thump for more history. Turning climate control to "off" when you stop the engine will indeed fix the noise on the subsequent startup. The is no apparent damage caused by this, although none of us can say what will happen in 10 years to the system as a result of this seemingly harsh startup.
I even tried taking it to the dealer about the thump last year and got the expected "what noise?" response. Sigh. I didn't want to go round and round with them and after reading here that everyone else has the same "feature," I decided to leave it alone and just turn the system off before stopping the rig.
'Course the downside of living with it occurrs on the day that I accidentally back over an import and just chalk it up to the a/c compressor thump and keep on rollin'
I even tried taking it to the dealer about the thump last year and got the expected "what noise?" response. Sigh. I didn't want to go round and round with them and after reading here that everyone else has the same "feature," I decided to leave it alone and just turn the system off before stopping the rig.
'Course the downside of living with it occurrs on the day that I accidentally back over an import and just chalk it up to the a/c compressor thump and keep on rollin'
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