hey guys, ive been hearing something that sounds like it may be backfire through the intake, what i find funny is that it will only do it when i shift, as my foot is off the gas and only on the lower gears. its not very loud, but it does have a distinct sound. im throwing an o2 code that i still need to look at, but i was just wondering if any of you have heard of this inbetween shifts? thanks.

 

mine comes out of the exhaust not sure why yours is coming out of your intake though

 

looks like timing is off. last time I saw that was when both cam gears on a b-series were totally upside-down

 

sounds like the cam timing is off look at the spocket (s) and see if they are tdc with the crank..and if they are . then try the ing.timing...