Exhaust pop when shifting
Safety Car
Joined: Jun 1999
Posts: 3,570
Likes: 3
From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas
Are you tuning yours? Have you looked at the DFCO? Do you have a scan to send me?
What about the ignition advance table? The stock tune goes negative which means the exhaust valve is open before spark and whatever fuel is in the combustion chamber goes out the exhaust before spark. This helps keeps the cat's and NBO2 sensors hot.
Burning Brakes
Joined: Oct 2010
Posts: 763
Likes: 2
Are you tuning yours? Have you looked at the DFCO? Do you have a scan to send me?
What about the ignition advance table? The stock tune goes negative which means the exhaust valve is open before spark and whatever fuel is in the combustion chamber goes out the exhaust before spark. This helps keeps the cat's and NBO2 sensors hot.
What about the ignition advance table? The stock tune goes negative which means the exhaust valve is open before spark and whatever fuel is in the combustion chamber goes out the exhaust before spark. This helps keeps the cat's and NBO2 sensors hot.
But this isn't so, That's the whole point of DFCO, to stop the fuel during decel, the burbling and popping is from overrun and evaporating fuel, not from ongoing injection.
Safety Car
Joined: Jun 1999
Posts: 3,570
Likes: 3
From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas
Like I said, having HPtuners you should be able to see how the DFCO works, I suspect maybe you don't realize what DFCO is? You said:
But this isn't so, That's the whole point of DFCO, to stop the fuel during decel, the burbling and popping is from overrun and evaporating fuel, not from ongoing injection.
But this isn't so, That's the whole point of DFCO, to stop the fuel during decel, the burbling and popping is from overrun and evaporating fuel, not from ongoing injection.
Does your injector duty cycle go to zero?
Does ignition advance have any affect?
