Missing DISA Flap (Pin still present)
 

Whilst replacing some split piping today I removed the DISA and upon taking out the DISA, the flap was missing, although the pin was still there. I put my hand in the manifold to see if I could feel the flap, but nothing. I have done lots of search on the interweb and there are 2 possibilites, 1 that it snapped and is in the manifold or 2 that a previous onver removed it? either option, i have no real way of knowing unless i take a manifold apart. That said, what damage could the flap cause? and where could it work its way into? I have the car in the garage tomorrow and debating if the pay the garage to strip the manifold? would prefer not to.

Time to find a garage that has a fibre-optic camera. Like this:

https://store.snapon.com/Video-Scope...s-P742121.aspx

You can also get fiber optic cameras on ebay for less than $100 (I think I paid $20 for a usb one with led lighting), or harbor freight.

The only place it would go would be down the runners. I highly doubt it would enter the combustion chamber. If its in the manifold still and wasn't removed by the PO, it is probably blocking a decent amount of air to one or two of the cylinders. You can also just remove the manifold. It isn't that huge of a job. Since the car is already at the shop, just have them scope it. I would assume that they have one.

Wishful thinking, if a PO removed the flap, why did he leave the pin in there?

You are going to have to remove the intake manifold to locate the flap so might as well bite the bullet and get it done now instead of later. It might have travel as far as the head it self and is now stuck at one of the valve area.

Well using a borescope would negate the need to pull the mani.

There's a reason why the DISA valve is there. Drive ability will be the big issue.

And when the borescope do locate the flap will you just leave the flap in or will you use a borescope like in a colonoscopy to remove it? :bustingup