The strap on my 90' 300TE has either broken or something. It makes a loud "POW" when the door is opened, and at normal door stop points. I don't know what is wrong, but I do know I need to get a replacement. I have the book on door disassembly/reassembly, but need to learn where I can pick up another door strap.
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1990 300TE - 165k miles
1985 Nissan Maxima - 351k miles
1979 XS 650 Twin - 125k miles (RIP)
1992 Infiniti G20 - 296k miles (strong!)
Agreed, just go to the dealer and buy one quick. I had one lock up on me after only making that noise for a week or so. My poor wife had to drive home from the supermarket with the passenger door locked open ! Can you imagine all the shouting and pointing as she drove by ? Get it fixed before this happens to you.