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A simple solution for door slamming problem? I finally finished my 8.8 Super Duty 8.8 Differential Conversion so I had time to handle all those small detail work. During my restoration work, I used Precision Weather Stripping to my worn OEM ones. But the Precision Weather Stripping always seemed too stiff for its job. So anyway, I gave them about 4 months but still had to slam the door to seat the weather stripping. It never got better so I know some members used late model KIA weather stripping from Amazon and good results. So I tried the Kia weather stripping. It was a lot softer but still had to slam the door. I decided to remove the Door Latch and study its operation. After removing it, I cleaned it and lubricated it with White Grease. Everthing seemed tested fine when it was out of the car. But after installation, the problem was still there. The Door Latch seemed like it still needed a little more inward movement to function properly. So with the Door Latch installed, I watched the Locking Mechanism operation. As the Door Glass was not installed yet, you have a good view of the Locking operation. this is when I noticed that one of the Latch Mounting Phillips Screws( 6mm x 1.0) was hitting the Linkage. This Screw is 4MM too long. The Easy Solution was to cut off about 4MM of the threaded end of the screw. Pic of the Long Phillips Screw-Inner Bottom Mounting Latch one. ". , Pic of "Corrected Phillips Screw" I really don't know when the Phillips Screw was mistakenly replaced with a Longer One. Owning the 240Z for 54 years, I am sure I removed the Door Latch at least 4 times. Anyway, if you are having Door Slamming Problems, check the LATCH MOUNTING SCREWS. It was a Simple Solution for me, maybe for you, too.

Have you verified your engine is actually at TDC? Your damper or timing marks could easily be off a few degrees. Enough to give you the results you're seeing. Verify TDC with a piece of aluminum rod or a piston stop in the #1 plug and then go from there.