Rattle at idle

[DAKOTAKIDD]

Hey guys, I have this little annoying rattle at idle. It sounds like a heat shield or something is loose. I climbed all over and under the truck and can’t find anything loose.

Any ideas?

I made a quick video with the rattling. It’s hard to hear on the video at times cause if the normal diesel noise

(how can I attach a video? It doesn’t let me)


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[KyleC4]

Well, since you posted in LLY I’m assuming that’s what the vehicle is. Try looking at hanger for exhaust front pipe that attaches at transmission. And then go to passenger side of truck and listen for around the bracket that secures down pipe from turbo to up pipe. Sometimes you have to look with an inspection mirror or spray some WD40 in it and see if noise goes away/changes. Very small crack usually through weld. I’d say most common things I see for stock vehicles

 

[dndj]

Good suggestions above. If you still can't find it, I've found a mechanic's stethoscope to be useful in the past when locating rattles, buzzing, and noises.

Amazon link to Lisle 52750

 

[DAKOTAKIDD]

Thanks guys, My up pipes and down pipe have been replaced. Are those brackets on aftermarket up pipes?

I’ll look into the stethoscope

Thx


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[ikeG]

Thanks guys, My up pipes and down pipe have been replaced. Are those brackets on aftermarket up pipes?

I’ll look into the stethoscope

Thx


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Most aftermarket up pipes do not have the bracket to bolt the downpipe to. Which may also be the source of your rattle. The downpipe may be rotated into the up pipe and they could be making contact

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[Nate’s Dmax]

The pass side battery tray likes to rattle sometimes. Easily heard in the cab.

 

[DAKOTAKIDD]

Thanks everyone. I have had no time to look at anything. I put a video on YouTube. Hopefully you can hear it

- YouTube

Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.

youtube.com

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[rcr1978]

Dipstick tube and down pipe is another place to check. Seen a few of those drive people nuts. They were mostly while driving though

 

[DAKOTAKIDD]

It was in the shop today for another reason and I asked them to take a look for the rattle and they went over everything in the front and couldn’t figure out what it was.

With a stethoscope the mechanic said it’s coming from the exhaust. Maybe something is in there!! IDK. But he was sure it’s exhaust related. It’s got an aftermarket flopro system on it.

They spent over an hour on it. It’s louder when it’s in gear or for some reason when you put the AC on???

Thx.


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[down_hiller]

Crawl under and hit your cat with a rubber mallet and see if it rattles, if it does the cat is broken up inside.

 

[DAKOTAKIDD]

So I’ve had no luck finding this rattle. Yesterday I had a friend at my house and he help locate the area of the rattle.

Goes like this:

Engine cold, idle in park, push on tranny dip stick tube and sound changes. Crawl under the truck and push on exhaust where down pipe meets exhaust and it stops. Push on the tube, noise changes.

Engine warm, idle in park, pushing on exhaust does nothing but push on dip stick tube it changes the rattle sound.

Engine warm, in gear, rattle is louder and pushing dip stick tube slightly changed sound

It’s totally in the area of the down pipe and dip stick tube.

Only one of the 2 bolts are there for the dip stick tube because of the aftermarket down pipe and I tightened it up—no change

Tightened the clamp from down pipe to exhaust—-no change.

With out removing the dip stick tube from the tranny and see what happens, Any other suggestions? Since the up pipes and down pipe is aftermarket, I don’t see any brackets or heat shields

Dip stick tube is touching the wrap on the down pipe.

Thx

 

[jlawles2]

Check the front pipe hanger support where it is supposed to be in the rubber grommet. I've had the grommet pop out and it rattles.

 

[DAKOTAKIDD]

Got it figured today. Finally. Lol

Originally when I bought the truck the egt gauge probe was threaded into the exhaust pipe just after the down pipe. Wrong place

When I did the head gaskets and egr delete, the new exhaust manifold came with the hole for the probe. The shop plugged the old exhaust hole with a brass looking plug.

The plug rattled loose and threads were toast. I pulled the pipe and had it welded closed today.

Noise gone finally.

Thanks for all your help.


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[TheBac]

funny how its almost always something that none of us could possibly figure out b/c we arent there.