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J8k'S CRX · Post by **J8k'S CRX** » Mon Jul 16, 2007 1:43 am

why does my exhaust pop during deceleration?

thsmrtone1 · Post by **thsmrtone1** » Mon Jul 16, 2007 1:38 pm

injectors shut off durring deceleration because of the high vacuum when the throttle is closed... if the vacuum isnt high enough (usually a iacv problem) then ecu will not fuel cut, therefore a "popping" sound when decelerating...

N2HIFI · Post by **N2HIFI** » Mon Jul 16, 2007 2:07 pm

or if you have a very free flowing exhaust and there is no backpressure it will pop, like if you have a high flow cat or test pipe.

chris

J8k'S CRX · Post by **J8k'S CRX** » Mon Jul 16, 2007 4:11 pm

thanks guys. it could be either, buy exhaust if pretty open. how do i check the iacv?

Spork · Post by **Spork** » Mon Jul 16, 2007 5:18 pm

my money is on the exhaust... it's a pretty common thing to hear reversion pops on cars (imports especially) with larger exhuast diameters. actually with an open 2.5 inch exhaust I would be surprised if you didn't get popping on deceleration.

J8k'S CRX · Post by **J8k'S CRX** » Mon Jul 16, 2007 5:23 pm

Spork;55218 wrote:my money is on the exhaust... it's a pretty common thing to hear reversion pops on cars (imports especially) with larger exhuast diameters. actually with an open 2.5 inch exhaust I would be surprised if you didn't get popping on deceleration.

so buy smaller exhaust in the future.:PDT_Armataz_01_40: