rattle

[maze00]

Hello,

I have a 2012 petrol cx5 with 165 bhp.

There are 2 things i don't like about the car.

1. When the engine is cold you hear a loud noise for about 30 seconds. Is there something that can be done to stop this ?

2. There is a rattle noise comming from the engine. The rattle gets louder and faster when you give more gas. I think its the fuelpump. Don't know what to do. It's driving me crazy !

 

[HandA]

on the startup Edmunds.com explained:

the exhaust manifold has thin walls and thus transmits more combustion noise than if it was some old-school cast iron chunkus. When cold, the ignition timing is retarded which puts more heat into the catalyst to aid light-off. This retarded timing also has stronger exhaust blowdown pulses, and that's what you're hearing.

Like they mentioned, rather than a chunk of cast iron the CX5 has a tuned header for the exhaust. Which means the tubes are of set lengths to improve performance and economy. Rather than just dumping out into a manifold like most cars do.

CX5 Header

typical exhaust manifold

There isn't anything that can be done to quiet it, but at least it isn't a sign of something being wrong.

Trevor
http://mazda.handa.com

 

[maze00]

Ok, thanks
I found out that when i start the car in the reverse gear the sound is much better.

Have you got an idea about the fuelpump rattling noise ?

 

[HandA]

Have you got an idea about the fuelpump rattling noise ?

I haven't heard any noises like that on mine. Once it gets over the initial warm up it is pretty quiet.

 

[robertmazda]

Minor point, but wasn't the first model CX-5 the 2013? I don't think there is a 2012. Of course, they were sold for nearly all of 2012 (sales started in Feb 2012), so they should have been 2012 models in my opinion.

 

[Reggae]

I guess wrapping the exhaust with thermal tape might quiet it down a bit also

 

[STE92VE]

Don't know what to do. It's driving me crazy !

Have you taken it back to the dealer and expressed your concerns?

 

[maze00]

Have you taken it back to the dealer and expressed your concerns?

Hi steve,
I did, they could not find anything.
When the engine is warmer the sound is not as loud as when the engine is cold.

I guess it's normal for this engine ?