Strange rattle...

Gambit · 18th December 2013, 11:04 PM

As the title says, my car has developed a strange rattle.

The rattle occurs when you accelerate, starts at around 2,500 to 3000 rpms (the point when the turbos spool up) also if you are pulling revs like above. E.g. the other day I shifted into 2nd at 40/50mph without foot on gas the noise was audible.

Liquid levels are fine and the car drives as normal, could this be wear on the turbo shaft or something more serious???

Idle off throttle in Drive gear the car is fine with only the injectors noticeable
when idle and exhaust and road noise when in motion... As usual.

The noise is like the the old playing card in the bicycle spokes rattle, except more metallic and less spokes.

Martin F · 19th December 2013, 10:56 PM

Noises are notoriously hard to diagnose over the internet

It could be many things, but as you say the car is driving fine then I suspect it's nothing related to the turbos. There is sometimes an issue with the arm on the EGCV valve breaking and the internal flap would then be free to rattle around, but that would effect spool up of the turbos.

Are you able to tell what area it is coming from at all? Tried driving with alternate front windows open to see if it's closer to the left or the right of the car.

Gambit · 20th December 2013, 01:12 AM

Windows don't help, all you hear is exhaust.

The noise is heard through the bulkhead and with my dash panels out, very noticeable.

The rattle gets faster the more you rev and mostly only under load. If I try to simulate it in park it requires 3000+ revs.

As it is not audible at idle and hard to simulate out of drive, I was leaning towards turbo or gearbox...

Martin F · 21st December 2013, 10:39 AM

It could be the heat shield right on top of the turbo's. The bolt holes on it tend to rust quite easily.

Gambit · 25th December 2013, 11:55 AM

Ok, I'm leaning away from the turbo's. It's more related to the rpm the engine is turning out.

If I put it in 2nd and drive it up into the 2 to 3k range the rattle is there, the faster I go the faster and louder the rattle gets.

I tried to make a recording with my phone, but it's like the Lex Luthor message to Superman and the phone didn't pick it up... ?

So I'm thinking drive shaft, gearbox or if I'm lucky (for a change) exhaust heat shield.

...Wait a minute.
I seem to recall putting a metal clip on the cat casing to hold two pieces of metal together before....

Martin F · 26th December 2013, 11:42 AM

Quote:

Originally Posted by Gambit

...Wait a minute.
I seem to recall putting a metal clip on the cat casing to hold two pieces of metal together before....

Sounds like a pretty good candidate to me

Martin F · 5th January 2014, 05:06 PM

Any joy tracking this one down?

Gambit · 8th January 2014, 05:46 PM

Quote:

Originally Posted by Martin F

Any joy tracking this one down?

Not yet Martin, it will require getting under the car to check the pipe and I've just not got round to it.

Gambit · 9th February 2014, 10:09 PM

Update:

Had my friend have a listen, he says it's not external, sounds like pinging/pinking...?

Are there any common causes of this in our cars, where to start looking...?

Martin F · 9th February 2014, 11:03 PM

It's not really common with our cars particularly in stock configurations like BPU. If that's definitely what it is I'd start by changing the plugs.

18th December 2013, 11:04 PM	#1
Gambit Old Timer Jap Spec GZ - Auto Aerotop (TT) Join Date: Jul 2004 Location: Worcester Posts: 2,089	Strange rattle... As the title says, my car has developed a strange rattle. The rattle occurs when you accelerate, starts at around 2,500 to 3000 rpms (the point when the turbos spool up) also if you are pulling revs like above. E.g. the other day I shifted into 2nd at 40/50mph without foot on gas the noise was audible. Liquid levels are fine and the car drives as normal, could this be wear on the turbo shaft or something more serious??? Idle off throttle in Drive gear the car is fine with only the injectors noticeable when idle and exhaust and road noise when in motion... As usual. The noise is like the the old playing card in the bicycle spokes rattle, except more metallic and less spokes. __________________ J-Spec Twin Turbo Aerotop 3G Brakes Blitz nur spec r Full Stainless DC Blitz Active Front Spoiler Controler Greddy Boost + EXT Gauges Running 1bar OZ Superleggera UK Spec Bonnet Scoop UK Glass Headlamps Mines ECU

19th December 2013, 10:56 PM	#2
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	Noises are notoriously hard to diagnose over the internet It could be many things, but as you say the car is driving fine then I suspect it's nothing related to the turbos. There is sometimes an issue with the arm on the EGCV valve breaking and the internal flap would then be free to rattle around, but that would effect spool up of the turbos. Are you able to tell what area it is coming from at all? Tried driving with alternate front windows open to see if it's closer to the left or the right of the car. __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

20th December 2013, 01:12 AM	#3
Gambit Old Timer Jap Spec GZ - Auto Aerotop (TT) Join Date: Jul 2004 Location: Worcester Posts: 2,089	Windows don't help, all you hear is exhaust. The noise is heard through the bulkhead and with my dash panels out, very noticeable. The rattle gets faster the more you rev and mostly only under load. If I try to simulate it in park it requires 3000+ revs. As it is not audible at idle and hard to simulate out of drive, I was leaning towards turbo or gearbox... __________________ J-Spec Twin Turbo Aerotop 3G Brakes Blitz nur spec r Full Stainless DC Blitz Active Front Spoiler Controler Greddy Boost + EXT Gauges Running 1bar OZ Superleggera UK Spec Bonnet Scoop UK Glass Headlamps Mines ECU

21st December 2013, 10:39 AM	#4
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	It could be the heat shield right on top of the turbo's. The bolt holes on it tend to rust quite easily. __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

25th December 2013, 11:55 AM	#5
Gambit Old Timer Jap Spec GZ - Auto Aerotop (TT) Join Date: Jul 2004 Location: Worcester Posts: 2,089	Ok, I'm leaning away from the turbo's. It's more related to the rpm the engine is turning out. If I put it in 2nd and drive it up into the 2 to 3k range the rattle is there, the faster I go the faster and louder the rattle gets. I tried to make a recording with my phone, but it's like the Lex Luthor message to Superman and the phone didn't pick it up... ? So I'm thinking drive shaft, gearbox or if I'm lucky (for a change) exhaust heat shield. ...Wait a minute. I seem to recall putting a metal clip on the cat casing to hold two pieces of metal together before.... __________________ J-Spec Twin Turbo Aerotop 3G Brakes Blitz nur spec r Full Stainless DC Blitz Active Front Spoiler Controler Greddy Boost + EXT Gauges Running 1bar OZ Superleggera UK Spec Bonnet Scoop UK Glass Headlamps Mines ECU

5th January 2014, 05:06 PM	#7
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	Any joy tracking this one down? __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

9th February 2014, 10:09 PM	#9
Gambit Old Timer Jap Spec GZ - Auto Aerotop (TT) Join Date: Jul 2004 Location: Worcester Posts: 2,089	Update: Had my friend have a listen, he says it's not external, sounds like pinging/pinking...? Are there any common causes of this in our cars, where to start looking...? __________________ J-Spec Twin Turbo Aerotop 3G Brakes Blitz nur spec r Full Stainless DC Blitz Active Front Spoiler Controler Greddy Boost + EXT Gauges Running 1bar OZ Superleggera UK Spec Bonnet Scoop UK Glass Headlamps Mines ECU

9th February 2014, 11:03 PM	#10
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	It's not really common with our cars particularly in stock configurations like BPU. If that's definitely what it is I'd start by changing the plugs. __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

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