Car so loud

clairegm

So Iv turned my car on and it’s so loud like a motor bike when ever I drive it it sounds ridiculously loud, I have looked at the exhaust and it seems ok and i have topped up the oil but I can’t find out the problem. Ita a fiat punto very old about 20 years old but only had 50k on the clock. 

facade

Most likely it is a hole in the exhaust somewhere. I would have suggested that the catalyst has been stolen, but on a Punto it is part of the manifold, so unlikely.

The_Rainmaker

You will need to get underneath the car to rule out the exhaust.  Put on side of the car on as high a kerb as you can find then slide underneath and have a look.  

Oh and open the bonnet and check around the manifold.

DoaM

With the car idling you should be able to determine the general area that the noise is coming from (i.e. front / middle / back). That should help you investigate closer to locate the source.

KimJongUn88

I doubt you've thoroughly checked the exhaust.  Not only is there the backbone, there's a middle section, maybe a cat and also where it joins the manifold.  Any part of those could have rusted through.  You need to get it on a ramp and have someone to have a proper look.

LandyAndy

Start the car and when it is idling put your hand firmly over the end of the exhaust. If the car keeps running then you have a hole somewhere in the exhaust system and, looking underneath,  you may be able to spot it.

From your description my money is on a holed exhaust.

The_Rainmaker

Or the exhaust has come away from the manifold.

angrycrow

When I had one of these Puntos the flange snapped off the exhaust manifold / catalyst section where it bolts to the centre section just in front of the flexi pipe. First warning that it was going to go was a really loud deep exhaust note. 

Start the car a feel for exhaust gasses escaping below the catalytic converter. 

Popped it off and welded the two parts back together and it was good as new. 

bob_a_builder

Has your catalytic converter been nicked 

Goudy

Check the flexi pipe, that's part of the exhaust.

It's right under the engine, you should be able to see it if you look up under the front.

Common for them to split. If the rest of the exhaust is still good you can just replace the flexi.

Just get the rotten bit cut out and a new generic flexi clamped in.

ElephantBoy57

clairegm said:

So Iv turned my car on and it’s so loud like a motor bike when ever I drive it it sounds ridiculously loud,

If it's really loud, it could be an exhaust leak at the front.