Excessive popping and pinging sounds from my LX470, what could it be?

[WannaCruise]

Hello all,

I have regular popping and pinging sounds coming from underneath my LX470 after it gets warm. I know there is thermal expansion and contraction going on, but this seems excessive. I notice it when I stop, and I notice it at red lights and drive throughs as well. I've added a video to Youtube that can be viewed/heard here:



This is after turning off the car, of course. It still happens when running, but it's not as bad, but still evident...

Is this a normal amount of noise for these vehicles? If not, what could be causing this?

 

[shane431]

That seems kinda loud to me. Weird.

 

[AlpineAccess]

That's more than the normal ticking of thermal expansion when compared to my vehicle. I would use a mechanics stethoscope and pinpoint the pinging noise.

It does sound like something hitting the exhaust or something loose in the exhaust, but its tough to say without narrowing the source.

 

[txaggie76]

I have this but a much lighter less version

 

[JunkCrzr89]

Cats clogged. Is it slow to accelerate?

 

[WannaCruise]

Cats clogged. Is it slow to accelerate?

Not that I can tell, but I'm comparing it to an LX450 so that's not a fare comparison...

 

[Jeremyleeblack]

I have this but a much lighter less version

Me too, it's a lighter version of the same thing.

 

[ClassyJalopy]

Cats clogged. Is it slow to accelerate?

Asks about a 100: "is it slow to accelerate?"

 

[JunkCrzr89]

Asks about a 100: "is it slow to accelerate?"

Good point But compared to all my other jalopies, the 100 is a rocketship!

 

[Formerjeeper]

Watching. I have same issue in my 2005 LC. Wondered about the cat.

 

[Mike NXP]

Echos of the garage making it sound louder? I like alpines suggestion of crawling under and poking around with a stethoscope to narrow it down.

Hell if my truck looked that rust-free on the underside I'd be OK with a little pinging and popping

 

[Jeremyleeblack]

I tried running some Cataclean through the truck, it seems to have helped a little bit but still popping a little. Whats the next step, taking out the Catalytic converter and cleaning it right?

 

[JunkCrzr89]

Whats the next step, taking out the Catalytic converter and cleaning it right?

Yeah, with rebar to bust everything out and make your 100 appear to have a cat but not actually have a functioning one

 

[Poomunj]

Did you ever figure this out? I have the same problem, otherwise drives fine...

 

[WannaCruise]

Did you ever figure this out? I have the same problem, otherwise drives fine...

I did not unfortunately.

 

[Mike NXP]

Did you ever figure this out? I have the same problem, otherwise drives fine...

These noises usually don't relate to any issues when the truck is performing fine. Sometimes folks have reported issues with their catalytic converters or something along those lines, but if you're driving fine then don't worry too much.

I'm curious, what is your driving style? Slow and steady? Maybe it's time for an italian tune-up. A tank of 91 octane but more importantly and a few spirited drives hitting and holding some higher RPMS than usual. Burn up all that carbon buildup in the exhaust system