Rattling noise - Saxperience

samburton53 · 23rd April 2011, 16:22

Hi all, when accelerating in my MK2 VTR, I get a noise that sounds like a metallic rattle, almost like a loose heat shield.

I've checked the heat shield on the manifold, it's on there good and tight. Is there anything else that could be causing the rattle?

Also, it is noticable mainly before I reach 3000 on the rev counter.

Dave_P · 23rd April 2011, 16:24

Baffles in exhaust?

samburton53 · 23rd April 2011, 16:26

Where abouts would they be, in the centre section? Would I be able to fix that?

LSOfreak · 23rd April 2011, 17:28

where abouts is it coming from? front/back/under the car?

samburton53 · 23rd April 2011, 19:50

Definitely sounds like it's coming from the front of the car... or at least middle to front. It doesn't sound like it's coming from the rear.

LSOfreak · 23rd April 2011, 20:08

do you think its the interior? like something behind the dash or headlining or doorcards

VTS123 · 23rd April 2011, 20:11

If it does it only when the engine is under load then it could be pinking

samburton53 · 23rd April 2011, 20:15

It's not the interior or any of the trim, if i open the window i can hear it more. Also, its a kind of metallic rattle.

What do you mean by pinking mate?

mishy · 23rd April 2011, 20:20

pinking is when combustion happens early basically. but it sounds more like the exhaust system is knocking on something, check the exhaust hangars.

samburton53 · 23rd April 2011, 20:29

Yeah there doesn't appear to be anything wrong with the engine, surely if it was pinking I would notice a change in performance, or engine tone? I'll check the exhaust tomorrow.

VTS123 · 23rd April 2011, 20:31

If it is pinking (also known as pre-ignition) it will do it when the throttle is open wider than it needs to be for the speed of the engine. If the noise stops when you ease back a little on the throttle then that is what it could be. It will happen more going up hills or if you have a full car too.
Redex might help stop it.

samburton53 · 23rd April 2011, 20:39

It seems to happen regardless of how heavy I am on the throttle, but the noise dissapears when the engine gets up into the higher end of the rev range (around 3000 on the tachometer).

Seems to be the same regardless of how much weight I have in the car.

stevo67 · 23rd April 2011, 20:58

Right this is a long shot,on my saxo I had an open induction kit when I accelerated I got a similar noise to what you described.When I changed back to a standard set-up the noise went,when I looked inside the induction kit it had lots of oil inside it.My only guess is that under load the oil was trickling around inside it causing the noise.

Steve.

LSOfreak · 24th April 2011, 12:51

could it be an exhaust leak?

adzvtr · 24th April 2011, 15:21

is it an early mk 2 with the cat under the car, if it is it could be the shield on the cat worked loose

kieranc07 · 24th April 2011, 15:26

mine dose this same noise if i hold the revs around 3000 it sounds dead like a heat shield but ive had them off and there all fine and my friend has same noise but taken all of his off and still dose it!!

get a video up and ill record mine and do a video

kennym1987 · 24th April 2011, 23:47

is it when the clutch is up?

moxy89 · 24th April 2011, 23:53

mine does the same, pisses me right off...

samburton53 · 24th April 2011, 23:55

Thanks for replies guys.

Stevo - I have changed from standard air box to an induction kit, the noise is exactly the same for both...

LSO - could an exhaust leak create a rattle? The exhaust tone is still very quiet.

adz - It's one of the later models with a manicat. Could the shield on it have gotten loose?

Kieran - I tried to record the noise before, but my phone won't pick it up... I don't have anything else to record it with! I expect it is the same noise, does anyone have any more ideas as to what it could be?

samburton53 · 24th April 2011, 23:56

kenny - yeah, the noise is when the clutch is up, it makes it when the car is revved in neutral too though.