04-21-2007, 10:54 PM
Dave Wrote:that's nuts.
BTW, did the title change?
Title? Of this thread? This is a new Thread.
Steve85 Wrote:How far down the exhaust is that?
Timing can cause that as well. Too late and combustion in process is pushed out of the exhaust valve. That usually shows up in the headers though.
Thats about 8" from the manifold so about 1 foot from the heads.
I was thinking timing but it only happened on one bank (passenger, not drivers side) and to effect individual cylinder timing isn't easy in these motors, and didn't change the global timing at all. I don't have long tube headers, just stock manifolds. I'm really starting to think it's a plug not firing and the spent gas is being pushed into the exhaust and the cat is catching it and trying to burn it, with a cylinders worth of gas coming every few seconds it would make sense.