Strange noise on overrun - Alfa Romeo Forum
You are currently unregistered, register for more features.    
 
Thread Tools
(Post Link) post #1 of 7 Old 08-05-13 Thread Starter
Gaz
Status: Privileged
Regional Support North
Is there a meet near you?
 
Gaz's Avatar
 
Join Date: Jun 2008
Location: Behind the wheel
County: Lancashire
Posts: 63,352
Strange noise on overrun

CF1 2.0 TS 16v in a 145 Cloverleaf

Engine is well maintained, regular oil checks/top ups, new plugs every year. Equipped with half decent panel filter, Alfatune exhaust system and Alfatune remap running 170bhp

When the engine has been warmed up, it pulls very strongly but when slowing down or when the revs are falling from mid range to tickover, it makes a strange rattly/ticky/grinding noise around the 2500-2000rpm mark. Doesn't do it under power or holding the revs steady, only when the revs are falling. It is due a full belt change soon but this noise sounds like its coming from the passenger side, or certainly to the left of the drivers side, could be a central noise.

It is definitely engine related, nothing to do with gearbox (that i know of) as it does it when either driving along, in any gear, or when stood still.

Any thoughts guys? If it needs a new clutch and/or flywheel, sod it. Its getting ripped out and replaced with a 20v turbo from a Fiat Coupe!

Gaz is offline  
Sponsored Links
Advertisement
 
Status: turbo powwa
AO Silver Member
 
celadon's Avatar
 
Join Date: Nov 2005
Location: United Kingdom
County: Kent
Posts: 5,699
Quote:
Originally Posted by Gaz View Post
CF1 2.0 TS 16v in a 145 Cloverleaf

Engine is well maintained, regular oil checks/top ups, new plugs every year. Equipped with half decent panel filter, Alfatune exhaust system and Alfatune remap running 170bhp

When the engine has been warmed up, it pulls very strongly but when slowing down or when the revs are falling from mid range to tickover, it makes a strange rattly/ticky/grinding noise around the 2500-2000rpm mark. Doesn't do it under power or holding the revs steady, only when the revs are falling. It is due a full belt change soon but this noise sounds like its coming from the passenger side, or certainly to the left of the drivers side, could be a central noise.

It is definitely engine related, nothing to do with gearbox (that i know of) as it does it when either driving along, in any gear, or when stood still.

Any thoughts guys? If it needs a new clutch and/or flywheel, sod it. Its getting ripped out and replaced with a 20v turbo from a Fiat Coupe!

Can you get a recording of it ?? might help a bit
celadon is offline  
(Post Link) post #3 of 7 Old 14-05-13 Thread Starter
Gaz
Status: Privileged
Regional Support North
Is there a meet near you?
 
Gaz's Avatar
 
Join Date: Jun 2008
Location: Behind the wheel
County: Lancashire
Posts: 63,352
I forgot i posted this, such was the flurry of responses!

I can try, might not be all that audible over the exhaust though but no harm in trying
Gaz is offline  
Status: No Game No Life
AO Member
 
imw1960's Avatar
 
Join Date: Apr 2011
Location: United Kingdom
County: Lancashire
Posts: 291
Quote:
Originally Posted by Gaz View Post
CF1 2.0 TS 16v in a 145 Cloverleaf

Engine is well maintained, regular oil checks/top ups, new plugs every year. Equipped with half decent panel filter, Alfatune exhaust system and Alfatune remap running 170bhp

When the engine has been warmed up, it pulls very strongly but when slowing down or when the revs are falling from mid range to tickover, it makes a strange rattly/ticky/grinding noise around the 2500-2000rpm mark. Doesn't do it under power or holding the revs steady, only when the revs are falling. It is due a full belt change soon but this noise sounds like its coming from the passenger side, or certainly to the left of the drivers side, could be a central noise.

It is definitely engine related, nothing to do with gearbox (that i know of) as it does it when either driving along, in any gear, or when stood still.

Any thoughts guys? If it needs a new clutch and/or flywheel, sod it. Its getting ripped out and replaced with a 20v turbo from a Fiat Coupe!
Sounds like a noisy variator to me. is it fine when cold but increases when hot, the spring in the variator can tend to get a bit sticky when the oil is hot and not as thick. when you get the cambelt done get new variator, and dont forget to get the water pump changed while its stripped down could pay dividens in the end.
imw1960 is offline  
Status: Anonima Lombarda Fabbrica Automobili
AO Member
 
keepRolling's Avatar
 
Join Date: Sep 2009
Location: South Africa
County: Gauteng
Posts: 975
Could it be a heat shied making the noise ?
keepRolling is offline  
(Post Link) post #6 of 7 Old 15-05-13 Thread Starter
Gaz
Status: Privileged
Regional Support North
Is there a meet near you?
 
Gaz's Avatar
 
Join Date: Jun 2008
Location: Behind the wheel
County: Lancashire
Posts: 63,352
Definitely not variator, had much experience with them over the years! Engine sounds as sweet as anything on tickover, no ticking injectors, no rattly followers and no diesel rattle from the variator. The only other noise is a lazy alternator pulley/bearing. Its very squeaky in cold and damp conditions but as all the belts run straight and the battery hasn't suffered, i haven't bothered about that for a while

Have been informed it could be something to do with balance shaft bearings and to run without the shaft for a bit. The noise definitely seems over on the passenger side of the car which is why i initially thought clutch/flywheel issue. Anyway i'll get it warmed up on the way home tonight and try and get a video or at least some audio
Gaz is offline  
Status: Living with partner
AO Member
 
Rigid27's Avatar
 
Join Date: Jun 2007
Location: United Kingdom
County: Edinburgh
Posts: 529
I had this noise on a 1.6 TS in my 147. It was a tensioner I believe relating to the variator. No noise under load but lifting off I would get a rattly sound as you describe. The car had just had a new timing belt and variator under warranty and the dealer changed the variator and timing belt again as it was pointless not doing it when in that area of the engine.

Apparently the tensioner was sticky compared with the others in the kit. It solved my noise.
Rigid27 is offline  
Reply

Go Back   Alfa Romeo Forum > Supported Alfa Romeo Models > Technical & Vehicle Assistance > Engines (TS, JTS, JTD & V6)

Tags
noise , overrun , strange

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome