Popping sound at idle...normal?
#1
Drifting
Thread Starter
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Keep in mind that I'm running a Fabspeed straight pipe (no muffler whatsoever). All smog equipment has been removed and/or plugged. Decel valve is gone. One thing that I've noticed is that at idle, every once in a while I'll here a random POP out of the pipe. My headers don't appear to have any cracks and I don't hear a "PFT" "PFT" sound when I listen near the cylinder banks. As far as I can tell the intake stuff is all sealed. Is this POPPING anything to be alarmed about? Or is this just from having an open exhaust?
I fully expect it to backfire and pop and burble when I'm driving the car and decelerating. I just wasn't sure if this would happen at idle.
AFRs are like 14.5 at idle
Timing is about 10 degrees at idle
I fully expect it to backfire and pop and burble when I'm driving the car and decelerating. I just wasn't sure if this would happen at idle.
AFRs are like 14.5 at idle
Timing is about 10 degrees at idle
#2
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Yep, its normal as long as it isn't excessive, which from your description it doesn't sound it. Every once in a while you get some unspent gasses in the pipe that as soon as it hits air will ignite making the little pop. Its probably the result of running these cars a little rich.
#3
Drifting
Thread Starter
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Thanks, srf! The car is running like champ. I didn't think it was anything to worry about, but I've never had a totally open exhaust (I know the turbo muffles to a certain extent).