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It makes a weird humming/rattling noise when I go over about

Customer Question
45 mph JA: What is the...
It makes a weird humming/rattling noise when I go over about 45 mph
JA: What is the model/year of your Toyota?
Customer: 4Runner, 2002. About 120k on it
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Haven't tried much, just trying to narrow down what it could be. Heard it was possibly a gasket
JA: Is this your first time dealing with this issue? What size is your engine?
Customer: I want to say it's a V6
JA: Anything else you think the mechanic should know?
Customer: It has been going on for about 8 months.
Submitted: 1 year ago.Category: Toyota
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Answered in 2 minutes by:
8/1/2016
Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago
david craig
david craig, Auto Mechanic
Category: Toyota
Satisfied Customers: 4,510
Experience: owner/mechanic at 3D Automotive
Verified

Hi Im David, would you say its more like a rumble?

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Customer reply replied 1 year ago
It's usually a constant humming but recently yes its a rumbling, sounds like its coming from the rear
Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

how old are the tires?

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Customer reply replied 1 year ago
6-8 yrs old
Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

6-8 years? wow. usually when the tires are worn they will cause a rumbling noise and folks get it confused as something like a bad wheel bearing because they both kind of sound alike

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Customer reply replied 1 year ago
I've heard it may be a gasket issue, it definitely sounds like something is wrong with the muffler
Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

ok so an exhaust gasket issue? very well could be. also do you hear a rattling noise?

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Customer reply replied 1 year ago
I do hear a rattling noise when I increase speed
Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

ok. are you able to get under the vehicle by the muffler?

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Customer reply replied 1 year ago
I can later but what would I look for. Also, to fix an issue like this, what would the incurred cost be?
Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

ok. when you do, make sure the engine is running so you can hear where the problem is. the rattling may be from the thin metal heat shield above the muffler and the rumbling may be a hole in the muffler or a leaking gasket at the muffler flange. you can put you hand near the flange to feel if there is a leak, but please dont touch the hot exhaust. the cost will depend on what is found

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Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

any update?

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Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

hello?

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Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

do you still need assistance?

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Toyota Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: Toyota
Satisfied Customers: 23,516
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
Verified

Hello and welcome to JustAnswer!

You could have quite a few things going on. If it has to be moving to make the noise then I would first suspect a tire or rear differential bearing issue. If the noise happens just with the engine running then it's more likely to be an exhaust leak.

Does the noise happen with just the engine running and sitting still?

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sprinkles08
sprinkles08
sprinkles08, ASE Certified Technician
Category: Toyota
Satisfied Customers: 23,516
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