funny popping noise?!?

[mfthechef]

recently ive been noticing funyy popping sounds when the engine is cold , rev the engine upto 3k or more let it drop down to 2-2.5k and this tiny pop suonds! car still runs fine.

any guesses?

 

[shaggy_master]

Slightly blowing exhaust?

 

[mfthechef]

what do ya mean by blowing, ?

 

[shaggy_master]

Air leaking somewhere before the backbox, through either a small rusty hole, loose joint or broken gasket? Have you checked all the joints in your exhaust?

 

[James]

Yep, when my backbox was leaking if you rev it to 3k or so and back off it popped, I used to enjoy doing it lol. When I sorted the backbox the popping stopped

 

[shaggy_master]

The noise is just a small amount of air escaping, just check the entire pipe from engine block to exit for rusty holes first, and if there are none, stick a rag over the end of the exhaust while the car's running and again check underneath for leaks, and if its a joint leaking, take it apart, clean all parts thoroughly, use some sealant or exhaust paste and put it back together and enjoy a nice smooth sound again

 

[rowdy-GTi]

Sounds normal to me as the mixture is richer. My car never goes above 2.5K when cold.

 

[Damo-Sri]

Mine does this all the time from cold, and on the way down the rev band after giving it a dig of the throttle while moving and warm. Pops and bangs lovely, quite like it actually.