Member Since: 27 Aug 2015
Location: Colchester
Posts: 697
New Squealing noise - Found It - crossover pipe no bracket
So I have a new noise today. Sounds a bit like the beginning of a belt squeal but I only replaced the front belt and tensioners a few weeks back. The squeal builds in volume (pitch is pretty constant) peaks at about 2k rpm then becomes almost inaudible by the time it hits 3k due to engine noise, so It's not that loud (more so with window open). It only happens with the engine under load and nothing in neutral even when the car is freewheeling. Noise goes if you back off throttle. Happened again on the journey home (8 miles) then appear to have disappeared on a short journey 5 minutes later (engine now fully warm).
Any thoughts on what it may be or how I can diagnose?
Last edited by trailhound on 6th Jun 2017 3:29 pm. Edited 3 times in total
15th May 2017 8:12 pm
trailhound
Member Since: 27 Aug 2015
Location: Colchester
Posts: 697
Same again this morning. With the window open sounds like it's coming anywhere from the engine to the transfer box. Does the same in low or high. So I'm thinking either a split hose, transfer box, front prop?
Anything else to add in it discount would be appreciated, along with any diagnosis tips! Definitely get better when the engine warms.
16th May 2017 8:18 am
lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
Bet you a coffee it not the belt but a split intercooler hose?
Long fat hose is the favourite, doddle to change
16th May 2017 8:21 am
trailhound
Member Since: 27 Aug 2015
Location: Colchester
Posts: 697
I really hope so as I have shiny new blue one in the garage.
16th May 2017 9:08 am
thommo1927
Member Since: 30 Sep 2016
Location: Cardiff South Wales
Posts: 415
Any black smoke & loss of power ? I had all these symptoms with the split top hose ,Tried to temporarily fix the split with gaffer tape. When I pulled away it made a sound like a wailing banshee ,Easy job to do
16th May 2017 2:21 pm
trailhound
Member Since: 27 Aug 2015
Location: Colchester
Posts: 697
No obvious smoke or power loss. I'll get it swapped out this weekend and report back. Fingers crossed it's nothing more serious. I can't understand why it eases up (gets quieter) after the engine warms up.
16th May 2017 2:29 pm
Sniffer
Member Since: 15 Aug 2015
Location: Tamworth
Posts: 223
Have you considered exhaust at all, had a squeaky manifold on a TD5 a few years back but as it got hotter it expanded and stopped, always there when cold though
Just an idea, check for soot around the manifolds and crossover pipe
16th May 2017 4:09 pm
trailhound
Member Since: 27 Aug 2015
Location: Colchester
Posts: 697
Thanks Sniffer I'll have a look underneath when I get a chance. Would a leak in the exhaust make a noise whether under load or not? Mine only occurs when the car is moving being throttled.
16th May 2017 4:25 pm
trailhound
Member Since: 27 Aug 2015
Location: Colchester
Posts: 697
Noise is better than it was earlier in the week for no apparent reason, still there though.
Replaced the top intercooler hose, problem remains.
Exhaust next, but it'll have to wait until I'm next underneath. Just not sure why an exhaust leak would squeal when the engine is under load, is the pressure greater?
20th May 2017 4:04 pm
Davethegeo
Member Since: 01 Oct 2015
Location: Edinburgh
Posts: 887
I had the same on a Td5. Sounded more like a budgie under the bonnet than a squeak, but definitely caused by a warped exhaust manifold.D1 300Tdi - gone
D2 Td5 ES (Alive remapped...mmm) - sadly gone
D4 2012 SDV6 XS - Stolen
D4 2014 SDV6 HSE - Shiny
20th May 2017 4:09 pm
trailhound
Member Since: 27 Aug 2015
Location: Colchester
Posts: 697
FOUND IT
Found it - It is my crossover pipe
Anybody had this done by a skinny armed recommended mechanic without body off / gearbox out; within 50 miles of north Essex?
23rd May 2017 7:22 pm
Landy_andy
Member Since: 05 May 2013
Location: Hertfordshire
Posts: 676
Talk to paul at Broadfields near dunmow.
Andy
24th May 2017 8:08 pm
Discomadness
Member Since: 19 Jan 2015
Location: Caerphilly
Posts: 2256
If you replace it can I buy your old one ? the bracket is missing on mine and it's probably gone already, I want to use an old one to make a modified one and swap rather than take mine off to modify.Jarrod
Current : D3 2007 HSE - AKA the lemon
-beanie grille
-detango with led bulbs
-club body off rebuild. TWICE.
24th May 2017 8:37 pm
trailhound
Member Since: 27 Aug 2015
Location: Colchester
Posts: 697
Landy_andy wrote:
Talk to paul at Broadfields near dunmow.
Andy
Thank Andy, spoke to him this morning
Booked in for a body off transplant in about 10 days (they're busy boys!)
Anybody got any ideas if it will last that long? It's been noticeable for about a week without any significant change in pitch or volume.
24th May 2017 8:55 pm
trailhound
Member Since: 27 Aug 2015
Location: Colchester
Posts: 697
Discomadness wrote:
If you replace it can I buy your old one ? the bracket is missing on mine and it's probably gone already, I want to use an old one to make a modified one and swap rather than take mine off to modify.
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
,Easy job to do 
the bracket is missing on mine and it's probably gone already, I want to use an old one to make a modified one and swap rather than take mine off to modify.
