Hi
I brought a used 04 RX8 last month and it was ok running fine , started fine when in cold and hot but today I started the car AFTER 3 DAYS and started fine I drove it for a couple of minutes in high RPM S and turned off around for 10 mnts and tried to start but it didnt start at once I tried couple of times and it started , so I drove agin and checked couple of times by switch offing and it starts fine back agin , but a strange blowing noice coming from the right hand side muffler when I rev the engine and the rpm needle comes down.
please help me guys
a

 

Hello

Welcome

Not a lot to go on here. Auto, manual? Miles? Mods? Fuel? Ignition Health? Location.

For starters, started it, drove at high RPM, then stopped it is not a nice thing to do to any engine. I start mine, let it idle for 15 seconds, then drive easy until coolant temp comes up.

In my opinion, if you have a weird sound from one side, it may be an muffler issue. It is a common pipe from the engine to the muffler. So, any noise that is only on one side would be muffler related.

 

Mine is a atoumatic , I use 92 octane
it have done 33,000 KM'S and no mods have done previous owner said he have replaced coils and plugs ,
and I never drive until the coolent temp comes up and today also I did the same and the sound I mentioned started to come today and it only comes when I rev and release the accilator , its a similor sound like coming from a gutted cat .

 

Have you ever heard that sound? It's not really different than with a cat, there's no blowing like you describe.

Pull off your cat and check the catalyst material for missing pieces.

Consider that your fuel pump may be overheating. Was your fuel tank full or empty when you kept it at high rpms?

 

to say exact is a sound like backfiaring and very recently I replaced my fuel pump cz of a stupid thing I did and my fuel light was about to switch on when I drove in high rpms

 

Cat check is good. Could be a piece of Cat back there. Bottom line, if it is only one one side, unless you have a wickedly custom exhaust, it is in the muffler or tail pipe. I could be a rusted section, or a piece of Cat stuck back there.

 

it is coming from the tail pipe as you said sir, and hope its not something big to repair and what woul be the reson that car didnt start at once ?