B16Drag

When Im at cruising down the freeway, I would sometimes hear some grubble or pop sound (not a high pitch "POP" like a balloon, but like BOOOM BOOOM). They are noticeable because I can actually feel them.

Just wondering if that was backfiring and if so what can be causing that? Just did a search, and some say its timing that is retarded too much and some say its too much fuel? I have not yet tuned my car for partial throttle so it could likely be running a tad bit rich...

I'm using uberdata on a t3 and b16 engine and rc 440cc's for those that care.

Any help is appreciated.

alwaystootall

is this just when u are crusing at part throttle or decelerating? i have a fmu and when im crusing sometimes it will load up and crack and pop and backfire.rev it up to clear it out, and off we go

shortyz

if your running rich its excess fuel.

also exhaust gases are still flammable, rally cars use a spark plug in there turbo housing to keep the turbo spooling on shift time. of course every race the turbo is fried to ----, but they got cheese. (just a little fact incase u wondered while watching WRC why they pop and shoot fire)

cheers.

baldur

No, they shoot fire all the time because of their anti-lag, when they close the throttle there's a big throttle bypass valve that opens and the ECU retards timing to ATDC so all the combustion takes place in the exhaust.

projekteg

back to the question at hand, yeah, you're more than likely just running a little rich. my car does it at part throttle also.

B16Drag

It happenes mostly while Im cruising on the freeway around -12 psi to -8psi.

kewbee7

mine does on a stock motor, wat da hell... it pops and backfires hella eversince motor swap. the motor was fine b4 i swapped it, it cam outta running integra

Could it be something with my spark?