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Old 02-13-2019, 02:49 PM   #1
cincygti
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Name this startup squeal...

Hi Folks...

'10 GTI with 85K miles on it. I had the valves cleaned at the dealer due to low power output / misfires. That problem was corrected, but since the day I got my car back every time I start my car (cold) it makes this sound:

https://www.youtube.com/watch?v=2Q9vNsvlOjM

As you can see in the video, it only lasts 10-15 seconds - but it is super loud and annoying. Again, it ONLY happens when car is cold. No sound at all on warm starts.

I took it back to the shop and they greased some belts and that didn't solve anything so I returned to the shop. Some previous searches turned up potential alternator belt tension causes, and some tensioner explanations.

Shop doesn't think those are involved and they believe it's coming from the high pressure fuel pump. They say it's just a coincidence that it started the same day I got my car back.

They say no charge for it if it doesn't fix it.

Anyone have any other ideas what this could be - specifically how it may be related to them cleaning my valves? That was expensive enough / not to mention the cost of replacing the HPFP.

Thanks!
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Old 02-13-2019, 03:13 PM   #2
NewGuy
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Should be able to tell if its coming from HPFP or belts by listening to engine closely. Two different sides of the engine so should be distinguishable.

As far as association to valve cleaning, most likely not.
Neither of these devices should be touched during that process.
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Old 02-13-2019, 04:52 PM   #3
dbizzle22
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Busted exhaust manifold bolt. I had the same sound fixed not long ago:

https://www.youtube.com/watch?v=c34vJZZbYHQ

https://www.golfmk6.com/forums/showt...08#post2602708
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Old 02-13-2019, 06:32 PM   #4
cincygti
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Quote:
Originally Posted by dbizzle22 View Post
Busted exhaust manifold bolt. I had the same sound fixed not long ago:

https://www.youtube.com/watch?v=c34vJZZbYHQ

https://www.golfmk6.com/forums/showt...08#post2602708
That does sound an awful lot like mine. They are calling tomorrow in the AM / I suspect the HPFP will not have fixed it.
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Old 02-14-2019, 12:24 PM   #5
dbizzle22
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Quote:
Originally Posted by cincygti View Post
That does sound an awful lot like mine. They are calling tomorrow in the AM / I suspect the HPFP will not have fixed it.
Yeah, yours sounds exactly like mine. I hear its a fairly common problem, especially if you've swapped downpipes before. Parts are cheap to fix the broken exhaust manifold bolt but labor drives the cost up significantly.
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Old 02-14-2019, 02:36 PM   #6
cincygti
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Quote:
Originally Posted by dbizzle22 View Post
Yeah, yours sounds exactly like mine. I hear its a fairly common problem, especially if you've swapped downpipes before. Parts are cheap to fix the broken exhaust manifold bolt but labor drives the cost up significantly.
My car is completely stock. They called and said the HPFP fixed the problem. I'm doubting it after watching the video you linked to. I'm going to pick it up shortly (waited a while so the car would be cold). Will report back.
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Old 02-14-2019, 02:43 PM   #7
Blakcard
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how the eff did they grease some belts????
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Old 02-14-2019, 04:09 PM   #8
cincygti
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Quote:
Originally Posted by Blakcard View Post
how the eff did they grease some belts????
lul, good question.

So, went to pick up the car. Paid for the repair, went out and started it up - sounds still there, loud as ever. He brought some of the mechanics over to listen to it again - back in the shop it goes.

I told them to investigate the exhaust manifold, but they seemed a bit dismissive of that theory. I'm sure I'll get a call later today or the in the AM that it's the manifold.
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Old 02-14-2019, 05:00 PM   #9
1ashchuckton
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Never spray belt dressing on the belt. If the belt is making noise you change the belt not spray gunk on it. While the belt is off check the tensioner. Those guys should know that. Hoping it is an easy & cheap fix whatever it turns out to be.
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Old 02-21-2019, 09:46 AM   #10
cincygti
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If this ends up being the exhaust manifold, what are the odds they caused it when cleaning my valves? The sound started when I got the car back from having them cleaned.
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