GKK

The popping noise is due to the larger diameter headers and 3" exhaust system...The engine also, lacks back pressure.

Perfectly normal, for the mods you have done...

Install the stock exhaust system and the popping will go away.





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tombrammer

"If you are driving a slightly accelerate, then let off the gas, you get a few mild pops out the tail pipes."
That can't be due to a badly adjusted valve, it would pop all the time right. Because you say it is when you let off the gas it makes me think it is timing related. Just a thought. Good luck.

DanielRicany

I just fixed a misfire on my car, before I fixed it, it was popping out the exhaust on decel. During DFCO, all the cylinders went lean, and the one that was misfiring must not have burned even the tiny bit of fuel that was being injected. This showed up on the AFR gauge along with a popping out the exhaust. Showed 14:1 on the AFR gauge on DFCO.

Just my 2 cents.

joe paco

I think the ECM shuts off the injectors during closed throttle deceleration. A popping should be a rich mixture, from my experience. I agree with GKK. The noise I heard on the video was normal.

Cliff Harris

DFCO is Deceleration Fuel CutOff, and it really does cut off the injectors completely -- no fuel into the cylinders.

I found out about this when I had a problem and had LEDs hooked up to the injectors. When I backed off the LEDs stopped flashing. Really freaked me out when I first saw it. Then I found out about DFCO...