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Apr 17, 2003 | 12:10 PM

Karic

Thread Starter

Elder User

Joined: Nov 2002

Posts: 772

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From: Victoria Canada

Thump?

Hey guys;

Lately when I start my truck, there is an occasional, muffled "thump" or "whump" under the passenger floor, one to two seconds after starting.

Seems about where the "Y" pipe comes together, altho' I'm not under my truck at 4am so I'm guessing.

It appears to be in the exhaust and happens about once in every four times. This is after sitting overnight, or for a full 12hr. shift, so it was run well before shutting off and has sat for a while.

Is this the dreaded "flutter"? Should I take it in?

Rick

Apr 17, 2003 | 12:24 PM

V10KLZZ71S

Fleet Mechanic

Joined: Sep 2002

Posts: 1,769

Likes: 7

From: Gretna ,LA.

Thump?

THUMP is the ac duct closing in the dash- no worry!

Apr 17, 2003 | 12:29 PM

Karic

Thread Starter

Elder User

Joined: Nov 2002

Posts: 772

Likes: 1

From: Victoria Canada

Thump?

V10;

Ya think? I'm not arguing, but it seems to be lower down. I'll pay more attention to it for the next little while.

Thanks, I hope you're right. (As always)

Rick

Apr 17, 2003 | 02:01 PM

V10KLZZ71S

Fleet Mechanic

Joined: Sep 2002

Posts: 1,769

Likes: 7

From: Gretna ,LA.

Thump?

Yeah not quite sure where it is located, lower than the dash, there have been many posts about the same sound. I get it and alarmed me too,does it right after startup

Apr 17, 2003 | 02:07 PM

ForDen

Senior User

Joined: May 2002

Posts: 294

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From: 5280 Feet

Thump?

The valve door closes pretty loudly under the dash on the passenger side. Evidently it's normal in SD's, so I guess we have to live with it.

Apr 17, 2003 | 06:27 PM

Karic

Thread Starter

Elder User

Joined: Nov 2002

Posts: 772

Likes: 1

From: Victoria Canada

Thump?

Quote:

Originally posted by ForDen
Evidently it's normal in SD's, so I guess we have to live with it.

Thanks guys,

I have to admit tho', I'm becoming suspicious of all these noises, bangs, whines, thumps and grinds that are "normal" with our SD's.

Enjoy your weekend,

Rick