[pbanders]

If you want your 914 doors to have a solid "thunk" when shutting, here are a few suggestions.

Remove the door panel. Make sure that all of the hardware for holding the door pocket or handle is in place and is secure. Remove the vapor seal. Remove any debris in the bottom of the door and make sure all of the window seals and hardware are in good condition and tight. Replace any degraded seals. Check to see if the rubberized damping sheet is present on the inner door metal - if it's as hard as a rock or missing, re-line it with a section of Dynamat or thick tar sheet.

Toss the old vapor seal, replace with Dynamat. It will add a grand total of maybe 2 lbs to your door. Replace your door panel, making sure all the clips are in place and are fully engaged.

Check the condition of your door edge seals, replace any that are degraded. With the roof off of the car, check to see if the window seals properly against the roll bar seal. If not, use the adjusters on the bottom of the door to reposition the window until it engages the seal from top to bottom. Note that it is often necessary to remove the seal and to re-position the channel to get the seal tight. Make sure that the windshield seal (the expensive one) is in good condition and that the little "flaps" are touching the window when fully up. If not, adjust the window some more until it does.

Roll down the window, replace the roof, roll the window up. Using your breath, check to see if you can "fog" the inside of the window by breathing on the edges and corners of the window. Make sure when the window is fully rolled up that it engages the targa roof seal. Take a test drive and note any air ingress, and readjust.

When you get it to where there is no leakage, try shutting your door now - I'll bet it has a much improved "thunk".