172 Noise

[B Real]

2000 W Reg 172, 69k. Owned it for a year, since 65k.

Recently ive been noticing a noise that I can only describe as like a jet engine on a boeing 747 (slight exaggeration) when hitting 60 mph in 3rd moving up to 4th (noise stays moving up into 5th gear too). When I drop to under 55mph(ish) the noise goes away. I can understand that some people may want a car that sounds like an aeroplane, but this is a new noise that wasnt there when I got it so im quite concerned.

Hard to tell where noise is coming from but feels like its from the back, possibly exhaust. Ive got what looks like a Magnex Back Box 6x4 oval tailpipe (was on it when I bought it).

It sounds like the normal engine sound, only noticably louder. I know the magnex is a loud exhaust, but this is not normal. Car is due a 72k service, and possibly a new cambelt. Could it be the sound is due to a wearing cam, or more likely a wearing exhaust?

Also noticed a bit of a flat spot in 3rd at around 40 - 60mph, feels like there should be a bit more power than there currently is. Not sure if this is related?

Opinions welcome

Cheers
Brad

 

[lemonnobby]

Possible rear wheel bearing is it a rotational type noise the faster you go the louder it gets?

 

[B Real]

No, once it kicks in its pretty static. The noise fluctuates very slightly, but this is not related to any changes in speed.

 

[Russ_16v]

could be a tensioner starting to make a noise

 

[alexbleubolt]

its just pressure in the exhaust, you got a induction kit in the engine ?

 

[B Real]

its just pressure in the exhaust, you got a induction kit in the engine ?

Not sure - how do I find out? I do know that theres an after market air filter.

 

[mij29]

could be the thrust bearing in the gearbox.

 

[16v_jon]

gearbox oil low or bearing in the bx as above, change the oil see if it sorts it

 

[B Real]

gearbox oil low or bearing in the bx as above, change the oil see if it sorts it

Is this something that would get taken care of in the 72k service?

 

[16v_jon]

gearbox oil low or bearing in the bx as above, change the oil see if it sorts it

Is this something that would get taken care of in the 72k service?

box oil isnt renewed, the box is checked for leaks, depends on the mechanic and his experience on the car. i change my box oil every 10k keeps my box nice and tight :clown:

 

[B Real]

This noise is coming on at low speeds now (20-30mph +). Im scared to drive it.

Does this still sound like the gearbox oil needing replaced? Is it easy/cheap to do? (got a 72k service on wed inc timing belts, plus new rear axle bushes which is costing me a fortune!)

 

[B Real]

bump.

going in for service tomorrow. Is it worth askin to change gearbox oil or better to wait until after service to see if noise goes away from usual service work?

 

[Russ_16v]

def ask them mate,and ask them to def check the box oil too