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Tapping/Rattling noise when accelerating

Posted: Fri Sep 18, 2020 12:13 am
by mengseav
Hi everyone
I've had this noise that I just can't seem to locate. It is only present when accelerating around low RPMs. The sound is not noticed when idling, though it can be heard very slightly when reving in P. The noise seems to be coming from the chain/belt side but very hard to pin point. Even driving on a hoist is very difficult to hear as there's no load on the wheels. I have scoured all the forums but no one seems to have the same issue or no actual findings for this. Video attached below recorded why driving.

Car is 2013 Polo 6R GTI.

I have checked/changed/tried the following already with no success:
all fuel lines/heatshields/brackets. nothing loose around and no noise on idle makes me believe it isn't any of those.
Have had the clutch and DMF replaced so can't be a dmf rattle.
have replaced the timing chain and tensioner
replaced waterpump
checked wastegate and its fine.
removed and cleaned sump and oil pick up

https://vimeo.com/457967143

Anyone know what it could be ?

Re: Tapping/Rattling noise when accelerating

Posted: Fri Sep 18, 2020 6:59 pm
by TrebleTA
The tensioner for the timing belt, or the waterpump. Maybe ya got a faulty bit.
Get someone to make the noise and use a tube like a hose to listen see if you can pin point more.

Re: Tapping/Rattling noise when accelerating

Posted: Wed Sep 23, 2020 10:43 am
by mengseav
TrebleTA wrote: Fri Sep 18, 2020 6:59 pm The tensioner for the timing belt, or the waterpump. Maybe ya got a faulty bit.
Get someone to make the noise and use a tube like a hose to listen see if you can pin point more.
Definitely not anything to do with the drive belt as i've tested by replicating the sound without the drive belt on. Seems to be coming from the Oil pump/oil pick up area. Have just replaced the timing chain and tensioner + oil chain pump tensioner. Sound is still there. Next up oil pump itself.. :cry:

Re: Tapping/Rattling noise when accelerating

Posted: Thu Oct 01, 2020 7:48 am
by mirceaculita
My dad has an old passat and one time an injector broke and every time I would accelerate a tapping like sound started. The higher the revs the faster the sounds were.
IDK if this can happen with the 6R's injectors.

Re: Tapping/Rattling noise when accelerating

Posted: Fri Oct 02, 2020 2:02 am
by mengseav
mirceaculita wrote: Thu Oct 01, 2020 7:48 am My dad has an old passat and one time an injector broke and every time I would accelerate a tapping like sound started. The higher the revs the faster the sounds were.
IDK if this can happen with the 6R's injectors.
SO the sound doesn't go away once accelerating faster ? Mines only there at low rpm, so between idle-1100 rpm when at a stand still, or around 2000rpm when moving. no or very low noise otherwise. Have changed everything I can think off now and it's still there.

Re: Tapping/Rattling noise when accelerating

Posted: Fri Oct 02, 2020 7:31 am
by mirceaculita
mengseav wrote: Fri Oct 02, 2020 2:02 am
SO the sound doesn't go away once accelerating faster ? Mines only there at low rpm, so between idle-1100 rpm when at a stand still, or around 2000rpm when moving. no or very low noise otherwise. Have changed everything I can think off now and it's still there.
I think the best route now is for you to record a clip of the car making that sound and linking it here.

Re: Tapping/Rattling noise when accelerating

Posted: Fri Oct 02, 2020 10:49 am
by Jay-Jay
It could be the variable valve timing pulley.

Re: Tapping/Rattling noise when accelerating

Posted: Mon Oct 12, 2020 5:07 am
by mengseav
mirceaculita wrote: Fri Oct 02, 2020 7:31 am
mengseav wrote: Fri Oct 02, 2020 2:02 am
SO the sound doesn't go away once accelerating faster ? Mines only there at low rpm, so between idle-1100 rpm when at a stand still, or around 2000rpm when moving. no or very low noise otherwise. Have changed everything I can think off now and it's still there.
I think the best route now is for you to record a clip of the car making that sound and linking it here.
clip is posted in the main post ^

Re: Tapping/Rattling noise when accelerating

Posted: Mon Oct 12, 2020 5:09 am
by mengseav
Jay-Jay wrote: Fri Oct 02, 2020 10:49 am It could be the variable valve timing pulley.
I replaced the VVT along with the timing chain :(. just another expense with no result. Sound definitely seems to be coming from the lower/bottom end of the engine

Re: Tapping/Rattling noise when accelerating

Posted: Mon Oct 12, 2020 6:17 pm
by amer6R
Main bearing/ crank shaft bearing