4.9 Strange sound
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7th Gear
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4.9 Strange sound
Hi, my trucks started making this sound on idle but also when starting to accelerate, i was wondering if any of yall might have an idea. Thanks heres the video:
https://photos.app.goo.gl/P1x32oZ5BrhMvDx18
https://photos.app.goo.gl/P1x32oZ5BrhMvDx18
Lead Driver
Joined: Jun 2021
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Hi, my trucks started making this sound on idle but also when starting to accelerate, i was wondering if any of yall might have an idea. Thanks heres the video:
https://photos.app.goo.gl/P1x32oZ5BrhMvDx18
https://photos.app.goo.gl/P1x32oZ5BrhMvDx18
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7th Gear
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the noise doesnt appear to be from the engine shaking at all, looks solid that way. do you have any mods done to your truck? can you also confirm what your exhaust system is like, factory , are the hangers all hanging straight down or pushed forward/back , heat shields strapped down etc
Last edited by Custom92; Jan 10, 2026 at 11:23 PM.
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Did your new manifolds properly seal at the y pipe? And the hangers are the isolator things that hold the exahust . look down strream the manifolds at the y pipe, cats, muffler, tailpipe
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7th Gear
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I totally forgot mb but i did muffler delete it idk how i forgot lol. but that is sealed and the only place that might have a hole is the tube coming from the smog pump to the rear cat was rusted out so i taped it and it was no problem. Ill go take a look at these hanger things and then get back to you. So from what im hearing you say is that its exhaust related? And would leaving it mess with the truck or is it just a sound that i can tolerate?
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I totally forgot mb but i did muffler delete it idk how i forgot lol. but that is sealed and the only place that might have a hole is the tube coming from the smog pump to the rear cat was rusted out so i taped it and it was no problem. Ill go take a look at these hanger things and then get back to you. So from what im hearing you say is that its exhaust related? And would leaving it mess with the truck or is it just a sound that i can tolerate?
and show me the area the muffler used to be in, picture wise
Be aware an inline 6 without a muffler will be somewhat closer to a tractor sound than youd probably want
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7th Gear
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THe tube to the secondary air injection NEEDS to be sealed or you will have fueling issues and exhaust leak
and show me the area the muffler used to be in, picture wise
Be aware an inline 6 without a muffler will be somewhat closer to a tractor sound than youd probably want
and show me the area the muffler used to be in, picture wise
Be aware an inline 6 without a muffler will be somewhat closer to a tractor sound than youd probably want
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Lead Driver
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what is that flex pipe looking stuff?
Also, what is that white stuff on the right side of photo? Is the ends welded at all to the stock pipe?
I am pretty sure we are just dealing with exuast leaks at this point
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7th Gear
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hahaha lol im pretty sure it’s literally called “flex pipe” my welder is 220 so i don’t have a plug in to reach where the truck is located so i couldnt weld those joints, so were you see the clamps is where i couldn’t get the welder. the white is an exhaust sealer that i put on at the same time. And it ended up just falling off but stayed in the area in between the pipes. i had no clue what i was doing lol. The original muffler had a low side and a high sides so the flex pipe helped get it aligned. If it is just exhaust leaks making the noise then thanks for the knowledge i had no clue when it came to the exhaust system. I’ll figure out how to weld those joints that aren’t, and the tube going to the cat.
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7th Gear
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ill weld it up i barrow a small welder from a buddy. the only reason its not welded is cus i have a welder that has a 220 plug and i couldn’t weld those joints
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create a solid pipe for the flex portion, your exhaust is intended to move as one piece on all the hangers, now it will break the flex with time because the tail pipe is moving around separate
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https://photos.app.goo.gl/FymBXawrd6NoMMYu8
— ill look into that copper spray thanks
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