Missing DISA Flap (Pin still present)

[Dark_stranger]

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.

[Skyline]

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

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

[Joshdub]

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.

[upallnight]

Originally Posted by Dark_stranger

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.

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.

[Joshdub]

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

[upallnight]

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

[upallnight]

Originally Posted by trader4

Yes, if the borescope can get to and see everywhere it could be.
IDK if it can or not. If it can, then I don't see why some are discussing
removing the intake for inspection.

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?

[upallnight]

Originally Posted by trader4

I've driven mine with the DISA valve flap gone, with the DISA
disabled and with the DISA working normally. Zero observed
difference. This DISA is like an appendix. Little or no benefit,
source of trouble. The alleged purpose is to improve midrange
torque, which it may in fact do. Personally I'd trade that little
bit of midrange torque for a design that's less complicated and
less trouble. Whatever it's doing, I don't see it in use for typical
normal driving.

M50 intake if you want to get rid of the DISA Valve and probably the CCV.

[Dark_stranger]

The bit that secures the flap in the main body of the unit can be pushed in, therefore making it look like the flap may have worked its way loose. My garage guy is going to take the manifold apart and check for the flap and any damage. To be honest removimg the manifold will make it easier for him to replace the split pipe as it sits under the manifold.

[Dark_stranger]

Originally Posted by trader4

Just so no one gets confused, the contribution of removing the
manifold to replacing the intake boot is very little. Very easy to
replace the boot without removing the intake. It might save a
couple mins because the two clamp screws would be easier to get at.
Removing the intake is quite a bit of work, but I guess maybe it's
worth it if you're that worried about the DISA flap that's not there.

Agree, the DISA problem only came to light upon trying to remove the boot, as i was unable to access the jubiliee clips holding the boot, therefore removed the DISA for better access and noticed the flap missing.