Disgusting metal on metal sound shortly after shutting off engine

[RutsyBucket]

Does anyone else have this issue? I took a video after immediately turning off the engine. The worst sound starts about 2 minutes after turning off the engine. It sounds like someone is pulling a nail through a rusty can. Absolute nails on a chalkboard noise, truly disgusting to hear.

Anyone else have this? Is it related to the ac chirp? wtf?

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[Cabby30]

Maybe a loose heat shield scraping on a bolt as it cools / shrinks. Sounds terrible haha

 

[PNWkip]

I am not getting the same visceral reaction as you lol

 

[Sagebrush]

I just want to know if you live next to a swamp? Frogs? Gators?

 

[395North]

Contracting metal somewhere. Stock exhaust?

 

[RutsyBucket]

I am not getting the same visceral reaction as you lol

It’s really bad in person, or maybe I’m just really sensitive to nails on chalkboard / grill scouring noises.

Contracting metal somewhere. Stock exhaust?

Running the Toyota trail dump exhaust

I just want to know if you live next to a swamp? Frogs? Gators?

Carlsbad… a few miles from the ocean. Regularly by the beach.

 

[395North]

It’s really bad in person, or maybe I’m just really sensitive to nails on chalkboard / grill scouring noises.



Running the Toyota trail dump exhaust



Carlsbad… a few miles from the ocean. Regularly by the beach.

dumb question but did you tighten the bolts down real good?

 

[RutsyBucket]

I just want to know if you live next to a swamp? Frogs? Gators?

dumb question but did you tighten the bolts down real good?

not dumb. I did torque them down pretty well, but I never redid it. I’ll give that a shot in the morning and see if it helps.

 

[Sagebrush]

Carlsbad… a few miles from the ocean. Regularly by the beach.

Am I hearing frogs in the video? Or is that the noise?

 

[Cabby30]

I believe he means the sound at 0:57 mark. The rest just sounds like normal cooling metal sounds.

 

[Will721]

Sounds like metal contraction. Perfectly normal, my trucks only done it once since I've owned it. But I did buy in October so only a few days have actually been warm.

It's especially common in motorcycles and turbo engines. Even more so if there's a highway right before shut down. If you know of a bar or hangout where harley riders tend to congregate you can hang out and listen to the bikes after they shut down and compare the noise.

 

[Longpatterned]

Mine “farts” about two minutes after shut down. I think it’s part of the evaporative fuel system….

 

[lpsoldia311]

All of those sounds aside from the big one at the end are pretty normal. It still sounds like a metal cooling but something is binding up a little more and then popping / releasing after relaxing from the thermal expansion. I'd check all your normal bolting connections at the exhaust points for looseness and all heat shields. If it's pretty reliably doing this after every run I'd take it to the dealership to get noted and see if it's an easy fix, but if it looks like they're just wasting time and not really doing anything about it then I'd grab a roller creeper and use my automotive stethoscope to narrow down the area is coming from and go from there.

 

[RutsyBucket]

All of those sounds aside from the big one at the end are pretty normal. It still sounds like a metal cooling but something is binding up a little more and then popping / releasing after relaxing from the thermal expansion. I'd check all your normal bolting connections at the exhaust points for looseness and all heat shields. If it's pretty reliably doing this after every run I'd take it to the dealership to get noted and see if it's an easy fix, but if it looks like they're just wasting time and not really doing anything about it then I'd grab a roller creeper and use my automotive stethoscope to narrow down the area is coming from and go from there.

Totally, I want to be clear that I’m only talking about the sound at 00:57, the rest all sounds very normal.

I’m gonna crawl under there and poke around in a bit.

 

[RutsyBucket]

Well, update here. I recently had new shocks and rear springs installed. The rear was quite saggy due to topper weight / extra weight on stock springs. I asked them to take a look around the exhaust heat shields to see if anything was extremely close.

After the taller springs and shocks were installed, I haven't heard this once. I didn't ask them if they looked and fixed anything while they were in there, or if the extra clearance was all that was needed, but thankfully, that nasty af sound is a thing of the past.

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