How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask sprinkles08 Your Own Question
sprinkles08
sprinkles08, ASE Certified Technician
Category: Toyota
Satisfied Customers: 22401
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
9825021
Type Your Toyota Question Here...
sprinkles08 is online now
A new question is answered every 9 seconds

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

Customer Question

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: 10 months ago.
Category: Toyota
Expert:  david craig replied 10 months ago.

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

Customer: replied 10 months ago.
It's usually a constant humming but recently yes its a rumbling, sounds like its coming from the rear
Expert:  david craig replied 10 months ago.

how old are the tires?

Customer: replied 10 months ago.
6-8 yrs old
Expert:  david craig replied 10 months 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

Customer: replied 10 months ago.
I've heard it may be a gasket issue, it definitely sounds like something is wrong with the muffler
Expert:  david craig replied 10 months ago.

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

Customer: replied 10 months ago.
I do hear a rattling noise when I increase speed
Expert:  david craig replied 10 months ago.

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

Customer: replied 10 months ago.
I can later but what would I look for. Also, to fix an issue like this, what would the incurred cost be?
Expert:  david craig replied 10 months 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

Expert:  david craig replied 9 months ago.

any update?

Expert:  david craig replied 9 months ago.

hello?

Expert:  david craig replied 9 months ago.

do you still need assistance?

Expert:  sprinkles08 replied 9 months ago.

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?