My LT1 intermittently goes snap, gargle and pop when decelerating, usually at RPM's over 3K.
It can be very annoying at times and I would like to address the problem if its an easy fix.

Why do these engines do this, is it a mixture issue or maybe timing.
See sig for engine specs.

Also I am running without a catalytic converter and I have the smallest opening plate in my Borla catback which I know exacerbates the problem. However this still happens with closed Borla and a running a cat.

Thanks

 

To rich mabey? What's your a/f? Was it tuned?

 

I always thought it was normal. Just the exhaust pulses changing length on deceleration.

 

most likely it's too rich, raw fuel hitting the exhaust pipes making the popping sound.

 

I think it's just a normal LT1 thing you can't do anything about.

mine did it from day one. still does it 80k later

 

It has nothing to do with your Air/fuel ratio.

It's not like there's so much gas in the exhaust it's causing an explosion.

 

When you let off the gas your injectors are cut off leaning you out makeing the exaust pop. Its normal.

 

Im pretty sure the injectros stop dumipng at under 1500, so think at higher rpm deceleration they are sitll dumping the fuel in the rails.

 

Decell at any speed and the pulsewith will close. If you have a real time scanner you will see that.

 

Personally I love that sound.

 

yup

"decel fuel cutoff"

 

No cats will do it.

 

For me it was one of the symptoms of a bad opti.

 

I was wondering when someone was gonna blame the opti LOL...mine pops and snaps on decel from no matter what speed for me, I also have the Borla...with cats. Not for long though

 

at least its decellaration instead of acceleration