Banging after 4k rpm, mostly in second gear?

[LiamR172]

Hi all, ive got a Ph2 172 non cup.

When i give it a blast and get up passed about 4k rpm, it starts making a very loud cracking, banging and clattering sort of noise, which will continue right up to the redline?

Its bad in second gear and it rarely does it in 3rd gear aswell.

Any advice would be greatly appreciated, thanks!

Liam.

 

[-J-]

Can you pin point where the noise is from?

Engine area, under the car, from the back?

 

[Jamie]

Pop the bonnet and ask someone to rev the car to understand if its from engine turnover or from speed on the road.

Also help to see if you can hear it, where it's coming from.

 

[LiamR172]

It doesn't make the noise when the can is in neutral, its only when I'm driving and I forgot to say that it doesn't do it when the car is cold?

 

[James105]

Does it sound like something like an engine mount is knocking around, or is it a mechanical noise from say gears in the box?

 

[Dan1587]

Exhaust? Mine used to rattle and bang around 4k.

 

[LiamR172]

I couldnt tell you if it was the gears in the box, ive got no mechanical knowledge haha.

Ive had a look at the exhaust system and given it a good shake about and nothing seems to be moving or banging against anything?

I was told by renault that it was that twisted engine mount but ive replaced that with a new part and its still making the noise.

Could it be where the exhaust manifold joins the centre section hitting the heatshield?

Thanks, Liam.

 

[.GAZ.]

Could be the drivers side engine mount bud.

Support the engine from underneath and take the mount off to check it.

(2 minute job)

 

[LiamR172]

Is that on the left of the engine as your looking at the bay, 4 bolts holding it in place is it?

Thanks for the replies!

 

[yellow_chris]

yes that is the one on the drivers side haha

 

[LiamR172]

Yeah... drivers side :s

Ill have a look at that tomorrow night if i get a chance! cheers

 

[yellow_chris]

your right with the mount you mentioned

 

[LiamR172]

I dont think its the mounting. could it be something to do with the metal part covering the fuel rail? from what i can feel, there is only 1 bolt holding it in place, (i cant see in the wholes) i cant move it with my hand but if i hit it, it makes a little rattle noise?

 

[LiamR172]

Can anyone shed any more light on this?

 

[-J-]

Could be the fuel rail guard as you suggest. Iirc some people ha issues with the bolts sheering / falling out.

Get a socket on it and take it off for a look, only a 2 min job.

 

[LiamR172]

I see there are 3 holes for bolts, but are there meant to be 3 bolts or just 2?

Won't get time tonight but hopefully get a look tomorrow!

Cheers

 

[LiamR172]

Had a mate in the car tonight and he thinks its the exhaust banging on something.

Im guessing its either where the manifold joins the centre section, or the rear of the exhaust which goes above the axel?

can someone point me in the right direction to look?
loose mountings or anything?

the exhaust is a cutom S/S from cat back, just the one section from the cat back to the box.

cheers, Liam.

 

[The Fatty]

apparently my exhaust used to do this before I bought the car; the dealer had to put something on the car or replaced something to stop it from banging. Im still not sure what was actually replaced even after 100 questions...

 

[LiamR172]

Hmm.. im hoping there will be a mark where its been knocking or something.

Car is going to get a radiator fitted on saturday so ill get it quickly checked over if i cant find anything myself!

 

[Chris_786]

Could be manifold to cat join? Bolts might be loose if the Cat's been changed recently etc... I had this problem when I changed the cat and didnt tighten them up enough.

 

[LiamR172]

Alright thanks mate, ill have a look at this tonight because it actually sounds as if its around that area! At first I thought it was the heatsheild banging off the manifold but its not that.

Cheers!

 

[LiamR172]

I had a quick look last night but i couldnt see anything loose?

i did find that a wire coming from the cat has been rubbing on something and has almost worn right through?

 

[gus592]

This sounds like what was happening to mine.

Under hard acceleration my back box was hitting the real axel hence the banging noise.

Got a new centre pipe which moved the back box away from the rear axel. Problem fixed.

 

[nashers]

what was the outcome of this?

 

[gus592]

Was my back box/centre pipe hitting the rear axle.

Got a new centre pipe and back box fitted correctly and all was sorted

 

[DeadRabbit]

Got the car at another garage today am hoping it's third time lucky on solving this issue will let ya know how I get on

 

[DeadRabbit]

Well this garage think it's the exhaust and basically said don't worry about it ... Will see how that goes for me