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Post by Nelson on Jul 29, 2017 22:59:30 GMT
Non-breakdown in the Mondeo has occurred and it's bugging the hell out of me
Firstly...the rear has developed what can only be described as a humming noise. A constant one tone hum that can be heard from 30mph upwards, best heard at 60-motorway speeds on the off side. It doesn't get worse when I rev the engine, nor does it stop when I put the car into neutral and rev a little, nor does it get worse under braking, cornering,, it's just a general same pitch hum.
I have recently had new rear brake pads fitted as well as wheel hub bearings on both rear axles. I have also swapped the tyres from front to back but that made no difference. They are still in good order and have 3-4mm across the tread. The alloy doesn't appear warped and I know I haven't clouted a kerb when parking and I do take it very easy over speed bumps and always miss potholes
My mechanic says it's the tyres causing a low pressure area. I think that's bollocks as I have owned my car for nearly 9 years and I have never experienced any sort of noise like this with any other tyres. Could it be an alignment issue?
He did have to replace the wheel bearing as he thought the first one he fitted just 2 weeks ago was faulty and hadn't made any difference to the noise. The replacement bearings he fitted last week have made no difference either
Calipers are fine, pads have just been changed, tyres have even tread. Mate of mine who works as a tech for Jaguar says it could be caused by worn shocks. I'm more inclined to trust him at the moment.
Thoughts.......
Secondly, only on full throttle (which I don't use a lot) I get a whooooosing wind noise from the exhaust. Exhaust has been checked and no holes or damage from the manifold back. Only happens on full throttle when the turbo is on boost. Turbo kicks in nicely, no lag, no flat spots and the torque is just a good so from a performance and economy point of view nothing has changed. Garage thinks I'm pissing in the wind trying to find an air leak in the turbo system.
Could it simply be a pin hole in one of the turbo pipes or does it sounds like the waste gate has issues? As I said performance and torque are unaffected and ONLY happens on full throttle, full boost I'd guess
Thoughts.......
Cheers lads.
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Post by bryan on Jul 30, 2017 7:24:20 GMT
Is there a difference in tread depth on any tyre? My TT Quattro did the same when the lease company replaced 2 tyres and left the others cause they were ok at 2.3mm.
Problem fix when 3 weeks later they were deemed to have worn enough to be replaced!
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Post by Blarno on Jul 30, 2017 19:53:21 GMT
The hum: Tyres. I found that the Postbox would start humming after a while, due to the tyres wearing oddly, possibly due to discrepancies in the control blade links on the rear suspension. Changed the rear tyres, laser alignment to tidy everything up and it went away.
The whoosh: Definitely not the wastegate as you don't have one - your car has a variable geometry turbo which has no need for one. It could just be that the exhaust is old and a lot more bedded in than it used to be. If it's causing no detriment, leave it be.
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Post by Nelson on Jul 30, 2017 21:48:43 GMT
The hum: Tyres. I found that the Postbox would start humming after a while, due to the tyres wearing oddly, possibly due to discrepancies in the control blade links on the rear suspension. Changed the rear tyres, laser alignment to tidy everything up and it went away. The whoosh: Definitely not the wastegate as you don't have one - your car has a variable geometry turbo which has no need for one. It could just be that the exhaust is old and a lot more bedded in than it used to be. If it's causing no detriment, leave it be. Thanks mate, appreciate that The hum: I'm going to get the alignment checked tomorrow so we'll go from there. The whoosh: so what do you think is causing the whoosh? it's only on full throttle which suggest turbo. Would it be a small leak in a pipe somewhere? |
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Post by Tim on Jul 31, 2017 10:25:09 GMT
The whoosh - could be an intercooler pipe?
I had that with my first Stilo and didn't really notice a drop off in performance but did clearly hear it.
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Post by Blarno on Jul 31, 2017 13:33:01 GMT
I couldn't say what is causing the whoosh without having a proper look. I only noticed the turbo whoosh on my Mondeo when I swapped the airbox for a cone filter. I've noticed recently that the Saab makes a lovely whistle as you floor it, but that may be because I have the windows open in lieu of working AC. I have had the entire intake system apart when doing the headgasket, so ther is a chance of a small leak, but my performance and economy are better than they were before, so doubtful. A small leak may go unnoticed, but a larger leak will probably ping the EML as the airflow sensor is expecting more or less air than it receives.
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Post by Nelson on Jul 31, 2017 15:22:43 GMT
Update from visiting another garage to the one I have used for years
HUM: i took the car to TW Tyres, they are tyre and exhaust specialists in Rugby and have been for over 40 years, they looked over the car and checked the tracking, alignment and general tyre condition and could find no fault with either so they took the car out and diagnosed a rear wheel bearing issue. The garage had fitted wheel bearings a month ago then refitted replacements last week as the noise hadn't gone away. So this will be the third set to be fitted, i hasten to add they will not be fitting the same brand again when they refit them on Thursday.
WHOOSH: how my original garage missed the 3.5inch hole in the exhaust pipe mid section when they checked the car last week I do not know. Within 30seconds they had found the cause of the 'whoosh' a dirty big hole which even had tell tale black sooting on the brackets which rather gave the game away quickly to the experts that something was wrong. I was able to get down into the inspection pit and see it for myself and take a photo to show the Mrs. Stevie Wonder wouldn't have missed this but my garage man did. So a part has been ordered and at a cost of £87 fitted will be done tomorrow.
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Post by Blarno on Jul 31, 2017 15:51:39 GMT
I made the mistake of replacing rear bearings for a hum and it made no difference, be aware. My tyres were in good condition and worn pretty evenly overall, but a fresh set cured the hum.
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Post by Roadsterstu on Aug 15, 2017 0:25:38 GMT
If 2 sets of new bearings haven't cured the "hum", it's not the bearings. It will be the tyres. I fohnd with the V50 that some local road surfaces set up a resonance with the tyres at certain speeds. Usually the main A roads that gad been coated with that "road dressing" shit. It just seemed to be a combination of tyre wear at the right point and the riad surface wear being at a certain point making the conditions just right for a humming noise to occur. The V60 didn't do it but in the last couple of weeks it too has started. On the same road in particular. I'm convinced it's that combination of tyres and surface again. There was nothing wrong with the bearings on the V50 and neither is there anything wrong with the V60.
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Post by Blarno on Aug 15, 2017 9:50:10 GMT
A different brand of tyre will likely make the difference.
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Post by Roadsterstu on Aug 16, 2017 8:19:42 GMT
A different brand of tyre will likely make the difference. Something other than "road dressing" crap will likely make a difference. |
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Post by Tim on Aug 16, 2017 9:52:09 GMT
There's a 200 yard section on my commute that makes the 320 hum like a Series 2 Land Rover on knobbly tyres.
The first couple of times it did it I thought something had broken but now I just ignore it.
There are clearly some bits of road that set up a vibration.
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Post by Boxer6 on Aug 16, 2017 10:26:58 GMT
There's a 200 yard section on my commute that makes the 320 hum like a Series 2 Land Rover on knobbly tyres. The first couple of times it did it I thought something had broken but now I just ignore it. There are clearly some bits of road that set up a vibration. There's a fairly lengthy stretch of the M90 just North of the bridge that does that to the Legacy. Bloody annoying it is too! |
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Post by Roadrunner on Aug 16, 2017 10:31:03 GMT
I had a similar hum on my Skoda Superb and that was definitely caused by tyres. A new set cured the problem straight away.
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Post by Blarno on Aug 16, 2017 15:49:11 GMT
A different brand of tyre will likely make the difference. Something other than "road dressing" crap will likely make a difference. You say that, but I went from one budget brand to another and it cured the noise. |
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Post by Roadsterstu on Aug 16, 2017 18:47:50 GMT
I was driving Mrs R's Captur today and noticed a tyre hum I don't recall last time i drove it. It was on the same shitty stone chip surface that has worn down to the rippled, uneven crap that they become after about 8 months or so. The tyres on her carvare nearing replacement and I'm convinced it's the well worn tyres on that kind of surface that does it.
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Post by Nelson on Sept 18, 2017 13:40:30 GMT
Well, well, well. I have this matter resolved, finally
The HUM: whilst the tyres aren't warped, cupping etc. they are wearing uneven, albeit only fractionally. I am using Michelin PS3's all round but this wasn't the issue on the source of the humming noise...
...having lost the plot after a drive to Wales and back recently, I lost all faith in the garage mechanic I have used and trusted for many years and took my car over the a mechanic I know in Daventry. He's bloody good, a bit blue but a good lad, I having used him in the past I wanted to try his expertise again (only stopped using him as he is 10 miles from me and getting to and from him is a bit of a faff) but I am so glad to did revisit him
He, within 10 seconds, and was probably quicker diagnosed the problem. A sticking rear brake caliper caused by the handbrake not releasing itself 100%. There was evidence of rust on the rear brake disc (caused by a heat build up of part of the pad sticking on whilst the wheel was rotating), therefore this was the hum. He took the disc off and found it to be warped. Replacing the disc and new pads has cured the problems 95%. There still is a incredibly faint hum but I can accept this will be down to the slightly uneven tyre and not the wheel bearing that the original mechanic thought and replaced. How he failed to see the rust on the disc and a slight grinding noise when spinning the wheel I will never know, how he missed the 4 inch hole in the exhaust when I took it to him complaining of a whoosh from the rear. Suffice to say I will not be taking my car to him again
Whilst I am on this... the Daventry mechanic also fixed the slight knocking noise from the front o/s. The original Rugby mechanic had again failed to address this put it down to the age of the car and told be to ''turn the radio up''. Seems he failed to fit the correct anti-roll bar, he fitted a cheap part. A better quality part later fitted by the Daventry mechanic and all is well
It honestly feels like I have a new car, it's quieter, rides and handles better too
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Post by Blarno on Sept 18, 2017 14:16:14 GMT
This is why I spanner my own cars and will continue to do so until it becomes impossible.
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Post by Roadsterstu on Sept 19, 2017 11:41:33 GMT
Good news. Wpuld an alignment be in order then? I can highly recommend Jackson Ford in Henley in Arden, as can others on here.
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Post by Roadrunner on Sept 19, 2017 11:44:11 GMT
Good news. Wpuld an alignment be in order then? I can highly recommend Jackson Ford in Henley in Arden, as can others on here. +1 |
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Post by Nelson on Sept 19, 2017 15:27:49 GMT
Good news. Wpuld an alignment be in order then? I can highly recommend Jackson Ford in Henley in Arden, as can others on here. Funnily, that's been checked and all seems well. the Daventry mechanic who is a tyre specialist and has been for years said it's the Michelin tyres themselves wearing oddly during to all manner of road conditions. He says he stopped fitting Michelins some time ago and only orders them in if customers insist as although he isn't owned, sponsored or biased towards one brand and hasn't got a grievance against Michelin he says that this isn't the first time uneven tyre wear and noise has been attributed to Michelins. The wear of mine is not in one section of the tyre which doesn't indicate alignment/tracking issues, mine are just wearing at both edges and some on the middle tread pattern alone, some only on one side (despite all tracking checked and balanced correctly). With 6mm on 3 of them and 3mm on the other (this was caused by the broken anti-roll bar causing the tyre to run poorly on the road and therefore wear quicker) I will need that one replacing very soon and I will have all the alignment checked again I won't be fitting Michelins again |
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Post by Boxer6 on Sept 19, 2017 20:46:22 GMT
Good news. Wpuld an alignment be in order then? I can highly recommend Jackson Ford in Henley in Arden, as can others on here. Funnily, that's been checked and all seems well. the Daventry mechanic who is a tyre specialist and has been for years said it's the Michelin tyres themselves wearing oddly during to all manner of road conditions. He says he stopped fitting Michelins some time ago and only orders them in if customers insist as although he isn't owned, sponsored or biased towards one brand and hasn't got a grievance against Michelin he says that this isn't the first time uneven tyre wear and noise has been attributed to Michelins. The wear of mine is not in once section of the tyre which doesn't indicate alignment/tracking issues, mine are just wearing at both edges and some on the middle tread pattern alone, some only on one side (despite all tracking checked and balanced correctly). With 6mm on 3 of them and 3mm on the other (this was caused by the broken anti-roll bar causing the tyre to run poorly on the road and therefore wear quicker) I will need that one replacing very soon and I will have all the alignment checked again I won't be fitting Michelins again Funnily enough, my front tyres (Michelin PS3's) have worn much more quickly than I thought they would and, somewhat surprisingly, at the edges rather than across the width as the rears have; that's despite the tracking and alignment being pretty much bob-on, and pressures correct. None of the other brands I've used previously have done that, so when I renew them (probably at the end of the month) I'm going to try Uniroyal's RainSport 3's, as recommended by quite a few guys I know. Hope they're as good as their reviews! |
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Post by LandieMark on Sept 19, 2017 20:53:32 GMT
We have PS3s on the Mazda. Bearing in mind it’s only done about 10k on this set in the last few years, the wear hasn’t been great. The TVR hasn’t chewed through its tyres nearly as much.
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Post by ChrisM on Sept 19, 2017 20:56:41 GMT
Very odd..... some years ago when I bought new tyres the tyre place said that Michelins were the only tyre that hardly required balancing because they were usually made so "perfect". I also found on the Galaxy (and the 820 before) that Michelins seemed to last longer.
Interestingly (?) the Captur came on Michelins, the fronts didn't last that long in my terms, but the replacement Michelins seem to be lasting much better despite being identical in type, size and rating.... so I wonder if there is an "OEM" version made down to a price that wears worse than the replacements you get from tyre depots.
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Post by Boxer6 on Sept 19, 2017 21:42:28 GMT
Very odd..... some years ago when I bought new tyres the tyre place said that Michelins were the only tyre that hardly required balancing because they were usually made so "perfect". I also found on the Galaxy (and the 820 before) that Michelins seemed to last longer. Interestingly (?) the Captur came on Michelins, the fronts didn't last that long in my terms, but the replacement Michelins seem to be lasting much better despite being identical in type, size and rating.... so I wonder if there is an "OEM" version made down to a price that wears worse than the replacements you get from tyre depots. Not having my "book" here at hand, I can't recall offhand how long these have lasted; I'll try and remember to check when they were fitted tomorrow. I dare say Michelin aren't alone in this, but many years ago when I had my first biggish bike (a 1994 CBR600F if anyone's interested), it came from the factory with the infamous A/M59 tyres on it. They were, basically, utter shit; OK in the dry, but in the wet pretty much like riding on slicks! Granted, they lasted a (relatively, for bike tyres) long time, but with a high risk of killing you - and I do mean that seriously! At the same time, Michelin produced the far, far better Hi-Sport, though they had to be properly scrubbed in before you got the bike leant over with full confidence; something that personally I never trusted the A/M59s enough to even attempt. My point being, Michelin definitely have 'form' for this sort of thing, with no reason it hasn't (a) continued and (b) happened in car tyres too. |
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Post by Roadsterstu on Sept 20, 2017 8:48:46 GMT
Very odd..... some years ago when I bought new tyres the tyre place said that Michelins were the only tyre that hardly required balancing because they were usually made so "perfect". I also found on the Galaxy (and the 820 before) that Michelins seemed to last longer. Interestingly (?) the Captur came on Michelins, the fronts didn't last that long in my terms, but the replacement Michelins seem to be lasting much better despite being identical in type, size and rating.... so I wonder if there is an "OEM" version made down to a price that wears worse than the replacements you get from tyre depots. How long did they last? I'm currently sat in the local tyre place having the 4 original Michelins on the Captur replaced with Crossclimate+. 31k miles that will be and I am assuming they are the original set, which I think is pretty decent. I hope the Crossclimates last as long. Given the price. |
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Post by alf on Sept 20, 2017 9:21:16 GMT
Funnily enough, my front tyres (Michelin PS3's) have worn much more quickly than I thought they would and, somewhat surprisingly, at the edges rather than across the width as the rears have; that's despite the tracking and alignment being pretty much bob-on, and pressures correct. None of the other brands I've used previously have done that, so when I renew them (probably at the end of the month) I'm going to try Uniroyal's RainSport 3's, as recommended by quite a few guys I know. Hope they're as good as their reviews! Do you run separate winters up there, Boxer6? I can't recall.... If not, are you not tempted by something like the Michelin crossclimates, or other all-season tyres (not that any that can genuinely handle snow seem as good in non-winter conditions as those crossclimates). I have heard of the rainsports on forums but have read a lot of tyre tests and don't recall them ever popping up in them, which seems odd... It's often worth reading the small print on tyre reviews - my Dunlop sport maxx RT2's make some noises about having changed the compound to work better in cooler conditions compared to most summer tyres, it will be interesting to see if they "go off" so quickly this autumn compared to most summer tyres, where as soon as it gets to about 5 degrees or cooler, I really notice it... PS - on the original topic - glad to see the hum is gone! The 330i had something similar for a bit, a rear wheel bearing, it was correctly diagnosed/fixed but so annoying while it was there! |
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Post by Tim on Sept 20, 2017 10:10:40 GMT
Anyone remember the Michelin XWXs?
A mate had them on his Alfa Sprint and couldn't get them to wear out!
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Post by Roadsterstu on Sept 20, 2017 10:44:13 GMT
Funnily enough, my front tyres (Michelin PS3's) have worn much more quickly than I thought they would and, somewhat surprisingly, at the edges rather than across the width as the rears have; that's despite the tracking and alignment being pretty much bob-on, and pressures correct. None of the other brands I've used previously have done that, so when I renew them (probably at the end of the month) I'm going to try Uniroyal's RainSport 3's, as recommended by quite a few guys I know. Hope they're as good as their reviews! Do you run separate winters up there, Boxer6? I can't recall.... If not, are you not tempted by something like the Michelin crossclimates, or other all-season tyres (not that any that can genuinely handle snow seem as good in non-winter conditions as those crossclimates). I have heard of the rainsports on forums but have read a lot of tyre tests and don't recall them ever popping up in them, which seems odd... It's often worth reading the small print on tyre reviews - my Dunlop sport maxx RT2's make some noises about having changed the compound to work better in cooler conditions compared to most summer tyres, it will be interesting to see if they "go off" so quickly this autumn compared to most summer tyres, where as soon as it gets to about 5 degrees or cooler, I really notice it... PS - on the original topic - glad to see the hum is gone! The 330i had something similar for a bit, a rear wheel bearing, it was correctly diagnosed/fixed but so annoying while it was there! I'm not sure Crossclimates would be that good on a more performance-oriented car. I've happily put them on the Captur but I wouldn't even consider them on the V60. A smaller-wheeled, softer-sprung V60 maybe, but certainly not the T6. |
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Post by Blarno on Sept 20, 2017 12:43:16 GMT
It may also be attributed to the passive rear steer on the Mondeo. The control blade links can move in directions that other suspension systems can't - longitudinally and laterally.
Not saying it is a factor, but it could be.
I suppose it's the price to pay for having sweet handling.
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