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A strange title I know.

If I accelerate up hard through third, fourth and fifth. If I back of the accelerator, my car makes a farting noise sometimes....now it never used to do this (before I started using Octane Booster)....is this a nice flame pretruding, or could it be something sinister?!?

thanks,

Matt
 

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Its the Secondary Air System (SAS), do a search on the forum for more details.

With my original ECU I used to be able to replicate the fart down a slip road of the motorway ;)
 

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Kyl3cook said:
cheers mate, is that a bad thing?
Nope

"If the engine speed is held above 4000 rpm for at least 3 seconds and you lift off causing a sudden drop in engine speed the SAS operates and you get a slight rumbling 'farting' sound from the engine."

It used to create a slight flat spot when I went back on the throttle, but thats not a problem now ;)
 

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lee5 said:
I thought the SAS was more of a rumble than a fart noise, which on my car came from under the car ???

Lee
One mans fart is another mans rumble :D
 

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lee5 said:
Span do you still get it with the autronics, as mine dont do it on the PFC ???

Its not a feature within the Autronics ECU, not sure of other aftermarket ECU's

Most of the guys with high power Evo engines have it removed.

Regards,
Brian
 

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mine pops bangs and rumbles everythin is sound on it at the moment the evo was brought into being to be a kick arse rally car to pop bang and whistle its way throught the forestry kicking every1s arse on the way and it did mint
 
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