Deceleration Exhaust Rattle, Pickle muffler on a 2.0 TIV Options

[avidfanjpl]

OK, thinking caps, please.

The car sounds great and is strong on acceleration, but it is like there is a slight, and I mean almost not audible, snap/pop on high rev deceleration. And it does not occur such that it is rev related. It might be some kind of post-ignition detonation in the exhaust system.

I had the valves lashed 400 miles ago, and there is no obvious sound of tapping or leaks. I know burned, bent valve sounds, and the engine would not perform like it is with a valve or a burned piston. I know those effects.

I have good hoses to the decel valve, which is tested and working. I have no exhaust leaks that I can hear. It idles perfectly.

This is a Dansk correct 2.0L muffler. Nearly new. Finished in Wurth Zinc Silver.

My detailer and I took off the muffler and reinstalled it perfectly to fix the detent bolt on the speedo. We used new bolts on the headers/muffler, and the gaskets are not new but almost new and not even worn. I checked all the head exhaust bolts. No sign of a leak. No loose anything. Shook the pipes to see if one was loose.

I am thinking it could be tin inside the Dansk???

Would once-used almost new exhaust gaskets cause a minor leak? They were bolted to correct torque specs.

Also does not seem like the heat shield is loose above the Dansk.

Any ideas?

Anything?

Thanks!

John
avidfanjpl

[avidfanjpl]

I can do something Saturday, Tom.

Any other ideas? It does not seem to be that serious, but maybe I should change the decel valve? I have a spare. I think all the decel valves are the same regardless of engine size in the TIV variety? Can you confirm?

And what was that tool that you took off the cheeseheads with? I really need to understand that.

Saturday may work. Maybe we should have lunch?

J