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Old 08-04-2015, 09:02 AM   #1
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Thumping noise under hood.

I got the tires rotated on the Interstate yesterday morning, then drove about 60 miles.

All was fine when I left home and when I left the tire dealership, but before I arrived at my destination I began hearing a thumping noise that seems to be coming from under the hood.

It is only present when I accelerate, not when idling or when backing up, and is faster when I go faster.

No lights on the dash nor other electronic indication of a problem.

Any suggestions, and is it safe to drive on home or should I try to find someone up in here to look at it?

Thanks in advance.


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Old 08-04-2015, 09:05 AM   #2
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Maggie - get it checked. They may not have properly tighten the lug bolts when they rotated your tires.


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Old 08-04-2015, 09:20 AM   #3
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I wondered about that, and if that could cause the noise.

They make you sign something there acknowledging you need to have the lug nuts tightened after 50 miles, post tire rotation. I drove a bit more than that getting up here.

It sounds like it's coming from under the hood.....but then, what do I know.

I can probably get that done pretty easily.

I'll report back. Thank you.


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Old 08-04-2015, 01:05 PM   #4
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Loose lug bolts on a front tire could make a clinking sound that sounds like it's coming from the engine compartment when driving.


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Old 08-04-2015, 01:10 PM   #5
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They have all been tightened, and a couple of the front tires were loose, so I'm hoping that was it.

Going to take my sister in law and her three grands for a drive for ice cream here in a bit, so will let you know if that was it.

I appreciate the help.


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Old 08-04-2015, 03:22 PM   #6
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No more thumping noises. . We drove about 25 miles.

I didn't mean in my last post that a couple of the front tires were loose, but a couple of the lug nuts on each of the front tires.

I was afraid a belt of some sort was flapping under there....but there were no dash lights on to indicate a problem. Sounded like it was coming from directly under the hood.

I've learned something.

Thanks for the help, it seems to be resolved.


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Old 08-04-2015, 10:11 PM   #7
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Maggie,
Check again after about 50-100 miles. Then, if 'NO' tightening occurs, extend your range to 200 miles... then if still 'tight', 500 miles.. if you can't 'tighten' them, then there is no further worry.

I would, however, make a visit back to the tire folks and speak with the owner/manager... say something like "Just letting you know, that the lug nuts were so loose, I could easily tighten them... Perhaps your mechanics need to re-calibrate their torque tools.... I am not asking you to 'confirm' there is a problem, I am just a concerned... customer." Depending upon how they respond, would dictate my next steps... which I won't disclose here... =}
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Old 08-05-2015, 06:31 AM   #8
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Thanks, Channing.

Since I have been in charge of these things , I have gone back into the tire place to have the lug nuts tightened..... Doug probably did this himself.

I haven't watched them, but did watch my nearly grown great-nephews yesterday, and saw a couple of those visibly move.....not just a hair, but a noticeable amount.

I don't know if that's usual, but it surprised me a bit....and then there was the thumping noise that seemed to come from under the hood.

I know that tire rotations on my Matrix do not include an instruction to come back after 50 miles to re-tighten.

At any rate, it is resolved, I am glad, and will be diligent about having this done.


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Old 08-05-2015, 06:48 AM   #9
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Quote:
Originally Posted by Lily&Me View Post
I know that tire rotations on my Matrix do not include an instruction to come back after 50 miles to re-tighten.
The average do-it-yourselfer doesn't tighten his vehicle's lug nuts with a torque wrench, so there's no way to tell except by trial and error to see if they're tight enough. From the Sprinter Operator's Manual (2011 edition, page 271):
Quote:
- have the tightening torque checked. For wheel bolts, the tightening torque is 177 lb-ft (240 Nm) (steel wheel)/133 lb-ft (180 Nm) (alloy wheel). For wheel nuts, the tightening torque is 133 lb-ft (180 Nm). The wheels could otherwise work loose.
So unless you use a torque wrench to tighten your lug nuts to at least 133 lb-ft, you don't know if they're tight enough, and rechecking every so often is a good idea.

But even with a torque wrench to check the lug nuts for proper tightness, the manual still recommends rechecking after 30 miles. The van is pretty heavy, and as the tires rotate the wheel can "settle in" and what you thought was tight while the van was up on a jack may not still be tight after the wheel has been on the ground under a load.

Memo to self… buy a torque wrench for tire changes, just in case.
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Old 08-05-2015, 06:58 AM   #10
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Hmmmm....thanks for that info.

Tires are something I simply don't wish to take on. Man-stuff to the max, in my opinion, and I have decided to leave this to them.

I have to get on the ground to check pressure/refill, it's dirty....and, I don't wanna do it.

I can go into any Firestone dealer anywhere in the country, and they will do this for me....for free. So, why not

I don't have the arm strength to do lug nuts myself, either, I am pretty sure.

I don't have to do it all..... I am emptying the holding tanks.


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Old 08-05-2015, 07:06 AM   #11
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I've had tires feel and sound funny after tire rotations. Seems after a few miles it goes away. I attribute it to different wear patterns from front to rear. Can be disturbing for a while. Good advice about the tire place, just give them a heads up. Be diplomatic. Rear tires wear flatter than front tires from my experience so the feel and sound may be apparent until they settle in after being rotated. I hope this isn't bogus info, it's just my observations. Good luck, enjoy your posts.
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Old 08-05-2015, 07:21 AM   #12
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I will call the tire place and let them know, have a conversation and hear what they have to say.

Longstanding, reputable folks, who Doug trusted completely, and no reason for me not to.

Not sure what the difference was this time, as this is the 4th, I think, tire rotation since I have been on my own......and never had this rather scary noise before.

It was a bit intimidating.


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Old 08-05-2015, 07:25 AM   #13
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It seems you have two options with most shops: They either overtighten the damn things so that you won't be able to get them off when you have a flat tire (and hopefully it doesn't warp your brake rotors), or they leave them too loose. Usually it's the former, which is at least somewhat safer.

During our recent road trip, we had two flat tires on our trailer in the space of an hour, so we had both replaced via roadside assistance at a rest area. The next morning, we had the other two tires replaced. The shop doing the second pair checked the first pair and found that they hadn't been inflated correctly or torqued down. Sigh.
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Old 08-05-2015, 03:07 PM   #14
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Our first camper was a VW pop-top in Alaska. After buying a new set of tires we had one pass us on a gravel road, didn't realize it was ours until the drum settled on the road. Since then, I always check lug nut torque!
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