Deceleration Hum - Toyota FJ Cruiser Forum
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post #1 of 35 (permalink) Old 01-13-2015, 07:25 AM Thread Starter
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Deceleration Hum

So I've had my FJ for 5 days now...for the most part I love everything about this truck, but I am experiencing one thing that I suspect may be a problem.

When decelerating (most noticeably from highway speeds, but still there at street speeds) I am hearing a low-pitched hum. The hum seems to be tied into vehicle speed, not engine or transmission. I wouldn't call it loud but it is definitely noticeable. I am thinking wheel bearing, tire (though these are not aggressive tires) or possibly u-joint. Not sure if the noise is there the rest of the time but may be masked by the engine/exhaust note.

I don't *think* this is normal, but please let me know if it is. I would like to be better informed before taking it back to the dealer (on the bright side this was a Certified Toyota so I have a warranty).

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post #2 of 35 (permalink) Old 01-13-2015, 07:37 AM
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Re: Deceleration Hum

What tires are you running?

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post #3 of 35 (permalink) Old 01-13-2015, 07:38 AM
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Re: Deceleration Hum

What year is the FJ, how many miles, Standard or auto trans? What make and style of tires and roughly how many miles or worn are they. Do you only notice the noise during deceleration and only within a certain speed range. What kind of exhaust, stock or aftermarket.
What happens if you get up to speed and just cruise and have you tried coasting for a short distance in neutral. Does the noise change worse or better when turning right or left? Do you have a roof rack and what make?
Lots of questions but all can either be a source of the noise or help identify the source.
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post #4 of 35 (permalink) Old 01-13-2015, 08:13 AM Thread Starter
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Re: Deceleration Hum

2010, all stock, auto trans, 50K miles. The tires are new or nearly new, Nexen I think is the brand (basically the cheapest tire the dealer could stick on there). They just have a boring all season tread, not aggressive at all, so a tire would have to have a broken belt or something to be a cause.

The noise seems pretty constant all the way to zero, like when you are coasting on an exit ramp, it just changes in pitch with vehicle speed, so I don't think it is in the tranny or engine. I have not tried coasting in neutral, I will do that. As mentioned, so far I can't tell if the noise is there or not when cruising or accelerating due to engine/exhaust noise. I will experiment a bit with light throttle at highway speeds, maybe I will be able to hear it then. Have not noticed any difference while turning, but I will pay more attention to that. Maybe I will do some swerving to check the wheel bearings.

I am reasonably competent at diagnosing noises like this (I seem to be the only one who is for our work fleet, you wouldn't believe the stuff people ignore in a work truck), but in addition to general diagnosis I just wanted to check if it is "normal" for an FJ. Truthfully though I don't think it is normal.

Oh, it may also be worth mentioning that it has been very cold the last few days, it was minus 10F or so on the way in to work today.

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post #5 of 35 (permalink) Old 01-13-2015, 08:43 AM
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Re: Deceleration Hum

Quote:
Serenity Now previously said: View Post
The hum seems to be tied into vehicle speed, not engine or transmission. I wouldn't call it loud but it is definitely noticeable. I am thinking wheel bearing, tire (though these are not aggressive tires) or possibly u-joint.
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2010, all stock, auto trans, 50K miles. The tires are new or nearly new, Nexen I think is the brand (basically the cheapest tire the dealer could stick on there). They just have a boring all season tread, not aggressive at all, so a tire would have to have a broken belt or something to be a cause.

The noise seems pretty constant all the way to zero, like when you are coasting on an exit ramp, it just changes in pitch with vehicle speed, so I don't think it is in the tranny or engine. I have not tried coasting in neutral, I will do that.
Coasting in neutral will eliminate everything but bearings, brakes and tires. Getting on/off the brakes while coasting will eliminate the brakes.

My money's on tire noise. You don't need to have a very aggressive tread to hear it, but obviously the mud-style treads are a bit louder. Even BFG All Terrain's make noise. Are you feeling anything through the steering wheel?

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post #6 of 35 (permalink) Old 01-13-2015, 08:51 AM Thread Starter
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Re: Deceleration Hum

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Coasting in neutral will eliminate everything but bearings, brakes and tires. Getting on/off the brakes while coasting will eliminate the brakes.

My money's on tire noise. You don't need to have a very aggressive tread to hear it, but obviously the mud-style treads are a bit louder. Even BFG All Terrain's make noise. Are you feeling anything through the steering wheel?
Nothing in the steering wheel. The vehicle drives and steers fine. The tires are not nearly as aggressive as BFG ATs, although I agree they could still be a cause if defective. I have driven an off-road truck with MTs for many years so I know what simple tread hum sounds like.

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post #7 of 35 (permalink) Old 01-13-2015, 09:27 AM
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Re: Deceleration Hum

Please make sure you post up when u find out the problem or non problem-- Thanks

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post #8 of 35 (permalink) Old 01-13-2015, 09:47 AM
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Re: Deceleration Hum

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The tires are not nearly as aggressive as BFG ATs, although I agree they could still be a cause if defective. I have driven an off-road truck with MTs for many years so I know what simple tread hum sounds like.
The only reason I don't go to bearings first is that you mostly hear of them being a problem on the early trucks (2007) and then around 100K+ miles. Being that your truck is newer and with half the miles, it's less likely to be the problem. If your truck came from a southern market and spent a lot of time in the water, maybe?

Do you have a GoPro or some kind of suction-cup'd camera? You could stick it on each corner and record the sound, to see if one corner is notably louder than another. Last-ditch: do a mod day and swap wheels/tires with another FJ, if your truck still makes it then it's 99% the bearings.

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post #9 of 35 (permalink) Old 01-13-2015, 11:03 AM Thread Starter
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Re: Deceleration Hum

I agree that 50K is way early for bearings. This FJ was in CA, AZ, and NM for most of it's life, and it is totally stock so it seems unlikely the POs did much fording.

I'll do some more situational listening and report back.

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post #10 of 35 (permalink) Old 01-13-2015, 12:54 PM Thread Starter
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Re: Deceleration Hum

Shifting into neutral does nothing for the sound. Swerving a bit from side to side changes the tone of the sound some, though not dramatically.

I'm leaning toward tires too. But I think I'm going to have to make the dealer test drive it and tell me so for warranty purposes.

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