Ok, I dont think this is a major problem, but after driving my truck for a while, I will get out, and I will here a loud "bong". I dont have any problems with the truck - any thoughts?

quote Originally posted by Madess: Ok, I dont think this is a major problem, but after driving my truck for a while, I will get out, and I will here a loud "bong". I dont have any problems with the truck - any thoughts?

is it smoking when it bongs?
ok seriously, did it just start this in cold weather? it sounds like something may be heating up and then contracting. might be a lose manifold or part of the exhaust. check the coolant and make sure its not overheating and making a chug, chug noise.
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“If I had asked people what they wanted, they would have said faster horses.” -Henry Ford

[This message has been edited by sostock (edited 02-06-2008).]

One of the front springs in my old Suburban would settle after it had been driven and would make a loud "BOING". It was most noticeable after doing something to extend the front springs, such as a full throttle standing start.

where is said "bong" coming from?
engine suspension ect...?
can you locate the general area ?
what is it, truck, blazer, ect... what motor and trans?
2wd 4wd ect....

I am pretty sure it coming from the back of the truck, but because of the metal echo type sound it is making I am not a 100% sure. I was thinking maybe gas tank expanding and contracting - it is pretty big 34 gallon.

2003 gmc sierra 4x2 5 speed - that is right 5 speed.

quote Originally posted by Madess: I am pretty sure it coming from the back of the truck, but because of the metal echo type sound it is making I am not a 100% sure. I was thinking maybe gas tank expanding and contracting - it is pretty big 34 gallon. 2003 gmc sierra 4x2 5 speed - that is right 5 speed.

My 2004 Sierra has a plastic tank....

is it a 2 pc deive shaft?
i had an 03 xtreme 4.3 5 speed (thats right 5 speed)
i herd that they had problems with the carrier bearings on the 2 pc driveshaft, and check out the rear tranny mount

heres pics of the one i used to have

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quote Originally posted by sostock: "What you shouldadid was fetch me that shovel from over yonder, now i'm a fixin' to whip your ass ya dick bag."

Gas tank. Both of my Blazers do that.

Boonie wasn’t in the back seat was he?

Sorry I just couldn’t resist.

It is possible something underneath is expanding and then contracting at that is what you hear. What it is may not be that easy to find.

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Technology is great when it works,
and one big pain in the ass when it doesn't.
Detroit iron rules all the rest are just toys.

My 2001 Silverado did it also. Kind of a "klink" sound. I bought it new and sold it with 115,000 miles on it and it did it from new until I sold it. Never did have it looked at. It did not do it all the time, but I didn't worry about it. I drive a 2006 Ford E250 for my work and it does more of a "thunk" sound sometimes.

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...Perfection....Where have you driven yours?

My 2003 Suburban does it all the time, it sounds like someone throws a rock at my gas tank. It happens no matter how full it is it just does it.

I think it's related to the emissions system. Not a problem, just the way it functions the expanding of the tank is a byproduct of operation.

[This message has been edited by Taijiguy (edited 02-07-2008).]

May have something going on with the tank vapor system. It may be pulling a slight vacuum on
the tank, slightly collapsing it, then when you stop, air bleeds back in and the
tank pops out where it was. Just a guess, you understand.
Does it do it after a long time or anytime you crank it?
Be easy to check though. After a time, get someone to kill the engine after you have
crawled under to look. You might be able to see or hear where it's coming from.
A new gas cap lately?
tg