It's a mystery to most of us so far... LOL Mine is progressively getting worse so I know it's a vacuum leak. I can actually hear a hissing sound now between the number 3 and 5 injector so I'm leaning toward my supercharger gasket (even though I spray carb cleaner and propane and NOTHING). As long as I give my car gas, it's fine.. As soon as I let off the gas it rumbles and pops (backfire but not like an actual backfire) then it will smooth out.. Very weird. But my fog machine was shipped today (I used the free super saver shipping.. :-/) so I'll get it middle of next week. I hope to see the fog coming out from under the supercharger where I hear the hissing and NOT a cracked housing or LIM. I'm eager to get this fixed so I can drop pulley some more..
Check your EGR tube and all your vacuum lines. But if it only happens at OP temp, that is odd.. sounds like something tune related, or part related and the heat opens a crack more?? Dunno... Hopefully once we find what's up with our, it will give more options to others.
I'll post pics and videos once I start playing with it. What I have to do is:
1. smoke test the car
2. replace rear valve cover gaskets (stupid zzp gaskets)
3. replace the 2 2.25 clamps on my cross over pipe with two 2.25" band clamps I now have
4. hopefully replace the supercharger gasket and fix my P0171 code lol
5. install my new tips... Ready to get my car's azz looking better...
