MK5 Golf GTI

All Things Mk5 => How to Guides / Troubleshooting => Topic started by: Ash_89 on February 12, 2018, 07:37:40 pm

Title: Engine rumble at low revs when pulling away
Post by: Ash_89 on February 12, 2018, 07:37:40 pm: Hey guys ,
I was wondering if it’s normal for these engines to sound really rumbely when pulling away
Mostly noticeable when engine is cold
The sound is like when you fit a foam Intake to a none turbo car it has that rumble when flooring it at low rpm

Golf gti bwa 2007/8
Title: Re: Engine rumble at low revs when pulling away
Post by: pudding on February 15, 2018, 11:19:42 am: Manual or DSG?

Yes it's a known thing for manuals to 'rumble' when taking up the clutch bite around 1000rpm from cold. Sounds nothing like what you describe though.
Title: Re: Engine rumble at low revs when pulling away
Post by: shaunK on February 15, 2018, 09:16:04 pm: Does it almost feel rough when pulling away and like its going to stall? Mine felt like that and it turned out to be the alternator pulley. Simple to test if its gone and also pretty simple and inexpensive to change.
Title: Re: Engine rumble at low revs when pulling away
Post by: Rigsby on February 15, 2018, 09:56:21 pm: Mines started doing this, sounds like mine is coming from the aux belt area.
A little research suggests it could be the alternator pulley.
Title: Re: Engine rumble at low revs when pulling away
Post by: pudding on February 16, 2018, 12:37:17 pm: Interesting. Hadn’t thought of replacing the alternator pulley.

£83 from VW :surprised:

Is the nut on there really tight? Easy to get off without an impact gun?
Title: Re: Engine rumble at low revs when pulling away
Post by: Ash_89 on February 16, 2018, 09:48:12 pm: Good shout on the alternator pulley yeah it does like pulling away il whip the belt off this weekend and test the pulley :driver:
Title: Re: Engine rumble at low revs when pulling away
Post by: shaunK on February 16, 2018, 10:32:56 pm: Quote from: Pudding on February 16, 2018, 12:37:17 pm
Interesting. Hadn’t thought of replacing the alternator pulley.

£83 from VW :surprised:

Is the nut on there really tight? Easy to get off without an impact gun?

Pretty easy to get off without removing the alternator with the right tool, I bought mine from ebay similar to this one https://www.ebay.co.uk/itm/BLUE-PRINT-Mounting-Tool-Kit-alternator-freewheel-clutch-For-VW-ADG05506/311998802980?fits=Car+Make%3AVW&epid=1537658071&hash=item48a493ec24:g:hcwAAOSwzXxaA1DJ
Title: Re: Engine rumble at low revs when pulling away
Post by: Rigsby on February 16, 2018, 10:35:48 pm: Please post your results on this.
@Ash_89 (http://www.mk5golfgti.co.uk/forum/index.php?action=profile;u=24806) whipping the belt off is a good idea
Title: Re: Engine rumble at low revs when pulling away
Post by: shaunK on February 16, 2018, 10:46:33 pm: Got my pulley from here for £20 by the way https://www.onlinecarparts.co.uk/
Title: Re: Engine rumble at low revs when pulling away
Post by: Ash_89 on February 17, 2018, 07:49:42 am: Will test the alternator pulley today And report back :happy2:
Title: Re: Engine rumble at low revs when pulling away
Post by: Rigsby on February 17, 2018, 09:03:45 pm: Can the pulley be removed without air tools?
I have a spare alternator so may as well swap the pulley over
Title: Re: Engine rumble at low revs when pulling away
Post by: shaunK on February 17, 2018, 09:31:01 pm: With the right tools and a breaker bar yeah its pretty easy
Title: Re: Engine rumble at low revs when pulling away
Post by: Rigsby on February 17, 2018, 09:33:23 pm: So breaker bar and that tool you put a link to? Is that all I need?
Title: Re: Engine rumble at low revs when pulling away
Post by: shaunK on February 17, 2018, 11:29:04 pm: A spanner also to hold the tool 15mm I think, I followed a guide somewhere for it but yes apart from slipping and taking a chunk out my hand it was a simple job
Title: Re: Engine rumble at low revs when pulling away
Post by: Rigsby on February 18, 2018, 10:59:40 am: Thanks I’ll get one ordered 👍🏼
Title: Re: Engine rumble at low revs when pulling away
Post by: pudding on February 19, 2018, 12:52:02 pm: Quote from: shaunK on February 16, 2018, 10:32:56 pm
Quote from: Pudding on February 16, 2018, 12:37:17 pm
Interesting. Hadn’t thought of replacing the alternator pulley.

£83 from VW :surprised:

Is the nut on there really tight? Easy to get off without an impact gun?

Pretty easy to get off without removing the alternator with the right tool, I bought mine from ebay similar to this one https://www.ebay.co.uk/itm/BLUE-PRINT-Mounting-Tool-Kit-alternator-freewheel-clutch-For-VW-ADG05506/311998802980?fits=Car+Make%3AVW&epid=1537658071&hash=item48a493ec24:g:hcwAAOSwzXxaA1DJ

Thanks mate, I bought the exact same Laser branded tool from Amazon. Is it man enough for the job? I've read the pulley is torqued to 85NM, which is fairly tight.

So the procedure is to hold the shaft still (T50) whilst undoing the pulley with the 33 toothed spline part of the tool?

I'm not even convinced my pulley is knackered tbh, but thought I'd give it a try as the rumbling noise on the clutch bite at idle has bugged me for years now!
Title: Re: Engine rumble at low revs when pulling away
Post by: shaunK on February 19, 2018, 01:48:47 pm: Quote from: Pudding on February 19, 2018, 12:52:02 pm
Quote from: shaunK on February 16, 2018, 10:32:56 pm
Quote from: Pudding on February 16, 2018, 12:37:17 pm
Interesting. Hadn’t thought of replacing the alternator pulley.

£83 from VW :surprised:

Is the nut on there really tight? Easy to get off without an impact gun?

Pretty easy to get off without removing the alternator with the right tool, I bought mine from ebay similar to this one https://www.ebay.co.uk/itm/BLUE-PRINT-Mounting-Tool-Kit-alternator-freewheel-clutch-For-VW-ADG05506/311998802980?fits=Car+Make%3AVW&epid=1537658071&hash=item48a493ec24:g:hcwAAOSwzXxaA1DJ

Thanks mate, I bought the exact same Laser branded tool from Amazon. Is it man enough for the job? I've read the pulley is torqued to 85NM, which is fairly tight.

So the procedure is to hold the shaft still (T50) whilst undoing the pulley with the 33 toothed spline part of the tool?

I'm not even convinced my pulley is knackered tbh, but thought I'd give it a try as the rumbling noise on the clutch bite at idle has bugged me for years now!

Yep thats pretty much it, they're pretty simple to test if they're gone you just slacken the belt off carefully put a screwdriver in the alternator fan to stop it moving then see if the pulley freewheels.

this video explains it better than I can
Title: Re: Engine rumble at low revs when pulling away
Post by: pudding on February 19, 2018, 03:19:43 pm: Cool, thanks, I'll try that first then.
Title: Re: Engine rumble at low revs when pulling away
Post by: Rigsby on February 19, 2018, 04:45:27 pm: Does the water pump run off the belt on ours?
Title: Re: Engine rumble at low revs when pulling away
Post by: pudding on February 20, 2018, 09:25:20 am: The water pump runs off the cambelt. The serpentine belt is just for the alternator and A/C pump.
Title: Re: Engine rumble at low revs when pulling away
Post by: Rigsby on February 20, 2018, 10:17:38 am: @Pudding (http://www.mk5golfgti.co.uk/forum/index.php?action=profile;u=10733) ah that’s good , so I can whip the belt off and go for a short drive
Title: Re: Engine rumble at low revs when pulling away
Post by: pudding on February 20, 2018, 10:40:09 am: Yep, very short. The power steering motor pulls a LOT of juice!!
Title: Re: Engine rumble at low revs when pulling away
Post by: Ash_89 on February 20, 2018, 06:35:02 pm: I didn’t get a chance to look at the alternator pulley guys weather was schocking
Mine doesn’t make a noise like a pulley usually would no sqweel etc just the revs bog down a lot when pulling away
Title: Re: Engine rumble at low revs when pulling away
Post by: shaunK on February 20, 2018, 08:24:57 pm: Quote from: Ash_89 on February 20, 2018, 06:35:02 pm
I didn’t get a chance to look at the alternator pulley guys weather was schocking
Mine doesn’t make a noise like a pulley usually would no sqweel etc just the revs bog down a lot when pulling away

Same as mine was, I had no noise at all but was really rough pulling away.
Title: Re: Engine rumble at low revs when pulling away
Post by: pudding on February 21, 2018, 02:06:15 pm: Took my belt serpentine off at lunch time and the existing pulley is absolutely fine. So my rumbling is something else.

Putting the belt back on again from above is fun isn't it!?!! :confused:
Title: Re: Engine rumble at low revs when pulling away
Post by: Rigsby on March 10, 2018, 07:44:20 pm: Went to put a new pulley on today and mine is seized on, I put a screwdriver in the alternator and the pulley doesn’t turn either way, so I think ive found the problem.
Just need a new alternator now as the pulley is not coming off
Title: Re: Engine rumble at low revs when pulling away
Post by: pudding on March 15, 2018, 01:36:52 pm: Bummer. I didn't bother with the screwdriver. Just turn the pulley to the right sharply then hold it. You should feel the pulley stay still whilst the alternator continues to turn. Some Auto Electricians diagnose the pulley by just yanking on the belt. They're also the best for refurbed alternators. Horrendous money from VW!
Title: Engine rumble at low revs when pulling away
Post by: dreadaccind on April 04, 2018, 01:47:51 am: Wow, thanks a TON for this diagram This will come in great handy when I redo my engine cover this spring
Title: Re: Engine rumble at low revs when pulling away
Post by: pudding on April 04, 2018, 01:31:58 pm: :grin:

Don’t forget to bikini your carrot under the sun :happy2:
Title: Re: Engine rumble at low revs when pulling away
Post by: Ash_89 on July 05, 2018, 03:50:45 pm: Sorry i didnt reply with a answer guys but im afraid i don't have one plus ive got rid of the gti
still got the alternator pulley though its a mystery i didnt solve
Title: Re: Engine rumble at low revs when pulling away
Post by: pudding on July 06, 2018, 11:59:18 am: That's one way to solve the problem :happy2:

Mine's still doing it, plus I now have some loud rattling around 900rpm on the bite when it's hot. Sounds very much like a dying DMF to me. Replacing that might solve both problems. I'm surprised there isn't a class action law suit against LUK/Sachs for their very short lived crappy flywheels, given the expense and hassle of replacing them.