jcstokes wrote on 09/12/14 at 02:06:49:Possibly, there's someone who has got a stock cap for sale after they've Bobbed, Cafed, customised or whatever. Check the marketplace section on this site, and some of the aftermarket suppliers.
what i cant gather is why it does it, suddenly, and if it means something is wrong or just an s40 nuance? it vents and runs well and usually only rattles in lower gears and speeds so it isn't worth replacing. i just hoped there was a simple fix...more of a challenge for me than anything

serow, it's definitely the cap innards. i have reached, grabbed, held, groped, etc. everything in arms reach while at "vibration" speed and nowhere does it affect the rattle other than when touching the gas cap. I'm gonna beat it eventually and I'll sell the secret for one million dollars