Tinkling exhaust manifold

octanejunkie · Post by **octanejunkie** » Mon Mar 27, 17 9:29 pm

My exhaust is making a noise like somebody has chucked a 10p piece into the exhaust manifold.
When i had a check over last october the mechanic said it was caused by some kind of emissions related valve or something. He said he'd sorted it, and at the time it went away. However, after the run today, the tinkling is back. What is in the manifolds of a 73 Charger 318 that would cause that??

Pete · Post by **Pete** » Mon Mar 27, 17 9:35 pm

If it does it under load it would suggest the timing is too advanced, it sounds like you are describing "Pinking" (pre-ignition) Bad for pistons and bottom end!

octanejunkie · Post by **octanejunkie** » Mon Mar 27, 17 9:45 pm

Not pinking, definitely a rattle of some sort

charger01 · Post by **charger01** » Mon Mar 27, 17 9:51 pm

Leaking exhaust gasket will give you a metalic tapping noise. Very common if you have crappy hedman headers which are a tw@t to seal

shaungriff · Post by **shaungriff** » Mon Mar 27, 17 10:10 pm

Heat riser flap in one of the manifolds

Captain Chaos · Post by **Captain Chaos** » Mon Mar 27, 17 10:41 pm

shaungriff wrote:Heat riser flap in one of the manifolds

That was my thought too. Removed one from my Monte Carlo when we made the exhaust,a vacuum operated flap that is on the bottom of one of the manifolds.

ScottyDave · Post by **ScottyDave** » Tue Mar 28, 17 6:12 am

On the passenger side of my 318

Post by **MattH** » Tue Mar 28, 17 10:24 am

Flap in the exhaust manifold for warm up. I have headers now so no flap.

octanejunkie · Post by **octanejunkie** » Tue Mar 28, 17 2:43 pm

Yep. Heat riser thing on the passenger side manifold. Most annoying thing ever.. It shall be destroyed!

Dave999 · Post by **Dave999** » Tue Mar 28, 17 4:29 pm

wire it in the shut position

Dave

XP29 · Post by **XP29** » Tue Mar 28, 17 10:10 pm

One of my manifolds has a flappy type thing that was making the sound you describe. It was loose and bouncing around so I fixed it in place.

octanejunkie · Post by **octanejunkie** » Thu Mar 30, 17 4:16 pm

Had a look underneath, and wedged it open, but i still get a bit of a rattle on the over run. Anyone taken theirs out? Can it be done without removing the manifold?

Captain Chaos · Post by **Captain Chaos** » Thu Mar 30, 17 6:01 pm

The one on my Monte was separate to the manifold,bolted on between the downpipe and manifold, I took the flap out but needed to reuse the body as it is was part of the exhaust,it would have been possible to make a piece but it was just easier.

I had an AMC that had the same set up too so I guess yours is similar.

latil · Post by **latil** » Thu Mar 30, 17 6:23 pm

Took my manifold off and removed flap and shaft then plugged the holes with the mig.

GJUK · Post by **GJUK** » Thu Mar 30, 17 9:42 pm

Possibly not sealed property - can sounds like something very metallic