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Old 02-04-2019   #1
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Exclamation Bravo stutter/slipping sound. What?

Hello. '08 Bravo 1.9 150 Sport here, and under medium acceleration from slow-med speeds (across gears 2-3 at least) it makes a really odd sound, like something slipping. Doesn't sound like crunching metal, and there are no rev fluctuations so I doubt it's clutch, but you can feel it as a slight loss of power on each sound. It doesn't happen all the time. Hard acceleration seems fine, as does very gentle acceleration. I don't think I've ever heard it in gear 4+ or in 1. Does anyone have any ideas?

Video attached.

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Old 06-04-2019   #2
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Re: Bravo stutter/slipping sound. What?

This post seems to have got lost in the flood of clutch clip resurrections, but I'd be really interested to have some opinions. Anyone heard anything like that before? Sounds like something slipping or rubbing, but not at the same rate the wheels are going around, and you CAN feel it through little losses of power so it's not just the V-belt or something. No rev fluctuations either. It's a puzzle.
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Old 08-04-2019   #3
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Thumbs down Re: Bravo stutter/slipping sound. What?

An update. It turns out the sound was: impending doom. Ended in a rattle and complete loss of power. Now in garage to see if it's gearbox or clutch, and whether it can be rebuilt or if it's time for a bucket of oats and a shotgun.

Will update more once he's had a look in its guts.
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Old 10-04-2019   #4
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Re: Bravo stutter/slipping sound. What?

So, DMF had gone, damaged the clutch too. With that, and replacing both rear coil springs (one had cracked), I'm down just under 1000. Not my best birthday ever...

Will update when I've driven it to check if the hushing sound was related to the clutch failing or if it's a separate issue. I really hope not.
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Old 11-04-2019   #5
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Re: Bravo stutter/slipping sound. What?

Thanks for updating, I've been watching with interest. I feel your pain! Its been an expensive motoring month for me as well.


Hopefully that'll be everything for the next year or so at least!
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Old 19-04-2019   #6
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Re: Bravo stutter/slipping sound. What?

Update: so that wasn't the sound of impending doom. The flywheel was a separate issue, which has been repaired and the clutch feels light and responsive now, but the car is still making that hushing sound. Usually just under 2800rpm, accelerating and turning. It's quite hard to make it do it, but sometimes it still does. The mechanic hadn't noticed it but he only gave it a quick run to see if it went and if it was leaking from the transmission since it'd had a damaged seal down there. I'm hesitant to take it back to get an opinion just yet as what with car repairs and tuition fees I've already spent more than 2k today, and none of it was on anything fun.
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Old 3 Weeks Ago   #7
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Re: Bravo stutter/slipping sound. What?

Hello thesmallprint. Did you get the car back for another opinion in the end? My Bravo does the exact same noise (and power loss) under medium acceleration, but no mechanic so far over here seems to know where this problem comes from. It's been like this for years, some days it happens more often than others, but it's really annoying because some day it will probably fail completely.
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Old 3 Weeks Ago   #8
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Re: Bravo stutter/slipping sound. What?

No, I've got an odd situation with my car in that I can't keep it at my house, so I don't actually get to drive it that much. I can tell you a lot of things it isn't: not the clutch (which is new), not the wheels nor tyres, not the performance chip. I've had MES hooked up to it as it goes along and watched every sensor I thought might be related and nothing. It sounds like pressure venting but boost pressure's fine, actuators for all the pressure systems don't seem to trigger in bursts like that.

I think the only way to be sure would be to get it on a dyno while it's hooked up to MES, and pin down *exactly* the conditions, and maybe have the bonnet open to see exactly where the sound's coming from, but that's expensive.

Far as I can tell it's worst in 2nd-3rd at 2800-3000rpm, in gradual acceleration. If you hoof it, it goes away. Same if you back off, but I've felt it as low as 2100 rpm, and can make it do it in 1st as well, though that's much rarer. Honestly it puzzles the hell out of me, and it's the only thing stopping me from fully enjoying the car, because I really do love driving the Bravo. Much nicer than prev Polo or Corsa, especially when it had the chip on and some nice new Conti PC6s on the front.
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Old 3 Weeks Ago   #9
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Re: Bravo stutter/slipping sound. What?

Thank you for the update! Mine does it sometimes, especially in 2nd under medium acceleration, as you said. Now that it got colder, this doesn't happen as often as before, but it could be unrelated to the temperature. Also, it often does what it sounds like the same noise to my untrained ears when I release the throttle pedal, but in this case there is no sudden power loss (obviously :-) ). To be honest, my only concern is that it makes me think I can't rely on the car for longer trips, although this behaviour has been there since I got the car 3 years ago.

Please keep me posted if you ever find out what it is and I will do the same.
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Old 2 Weeks Ago   #10
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Re: Bravo stutter/slipping sound. What?

I did think of something after writing that last night: check your air box. When I changed my air filter, I found one clip gone, the box open and the other clip rusted badly. That had been letting debris get into the MAF sensor, which is why I checked it. I now wonder if that's come loose again and is affecting the air flow into the engine? Worth checking, anyway.
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Old 2 Weeks Ago   #11
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Re: Bravo stutter/slipping sound. What?

Thanks thesmallprint, that's quite an easy one, I will check! On the other hand, the car was regularly serviced, but who knows?
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Old 2 Weeks Ago   #12
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Re: Bravo stutter/slipping sound. What?

I'm wondering if this could be related to the boost solenoid. Possibly a very stupid idea, but I've seen videos on youtube of various cars with somewhat similar symptoms that took me to this idea.
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