Ticking sound under the driver door

[Playare]

I noticed this a while ago but just figured it was my truck getting old (just about 243k miles) but today I figured i'd get out and look before I turned the truck off. I open the hood and I can't hear it. So I go back to my door to shut it off and there it is again.

I haven't looked under it since it's 100 outside and I just ran my truck for 20min. Any ideas as to what it could be? I know the fuel pump is right around there, anything else I should look at?

 

[stroker52]

exhaust leak....

 

[SAATR]

exhaust leak....

Laws Yes! M O O N, that spells exhaust leak! Probably at the flange. It would help to put it on a lift and listen while it's running, or to get a length of hose and use it as a stethoscope all around the exhaust manifold.

 

[MOBS]

Crank it and have someone hold their hand(s) against the exhaust tip(s) and listen around your exhaust, if it's a slight leak, you'll hear/feel it a bit....if it's a bigger leak, you'll feel air puffing out. That's how we test exhaust after install for leaks.

 

[Playare]

Can this be anywhere from the manifolds to near the tip or will it be a specific place? I'll check it out tomorrow morning. Hopefully nothing big.

 

[MOBS]

If it's stock exhaust and it sounds like it's under the middle of your cab, then it could just be a pin-hole in the big single tube; oh I just noticed it's an rcsb, that location sounds like a rusted out section around muffler.

 

[Playare]

Upon further inspection (crawling under the truck) the noise is coming from my cat. When I first turned it on there wasn't a noise because it wasn't warmed up I'm guessing.

What can I do?

 

[MOBS]

Is it a sound like there's something rattling around on the inside or loose metal/glass is vibrating against the bottom?

 

[Playare]

It does sound like there's something rattling in there! What is it?

I'm not sure that's what's making the tick though?

 

[MOBS]

I dont think it would make a 'tick' sound either unless there was a hole around there that normally was covered in shrapnel but maybe opened up if the shrapnel moved. If your cat is making a scratchy rattle or sounds like grit sliding/rattling around, then the cat is prolly on it's way out.