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Mine did that and drove me crazy finding it . It turned out to be the 2 nuts that hold the mufler up behind the rear bumper they had somehow gotten slightly loose when i found them tightened the heck out of them and no more rattleby poorsche1 - Main Forum
i hear you on the reliability,92 Honda accord 240,000 miles when wife totaled it never a problem 98 Honda accord v6 215,000 the only thing i have changed are the timing belt, oil and brakes, wife's Toyota same never an issue, my Porsche, drive it a few days work on it for a few weeks, it seems. as much as these cars cost they should not only be the top in performance but they should be the leadeby poorsche1 - Main Forum
update on this issue. no more clattering at 2800 solved that issue created another. i have not had much time to work on the boxster for a while, but i had taken the apart the valve cover on bank 1,2,3 a couple of months ago and found what i took to be 4 collapsed lifters (tappets), 3 exhausts and 1 intake. I purchased a new set for that whole side, last week i had time to dedicate to reassembly,by poorsche1 - Main Forum
thanks marc you are right i couldn't get the mic on my phone to pick up the sound as i hear it and my brother in law was there and also noted that he had not heard the noise prior. i really don't want to keep on reving the motor to try to record the sound as that might be doing more harm to whatever is causing the sound this next week i am swamped at work so probably won't be working much on heby poorsche1 - Main Forum
figured out how to upload to you tube the link is http://www.youtube.com/watch?v=em4MYUQ57wI you can barely hear the clattering towards the end. e didn't want to run it longer mainly because i heard the sound without the belt and because it had been idling for about 10 minutes prior while i as listening to bearings and pulleys and the motor was warm.by poorsche1 - Main Forum
well i have always done my own work on my cars until i get stumped. but that is a rare case. have a 73- 914 2.0 that i have rebuilt the motor on and upgraded it to racing specs and a few Chevy v8's that i built, one of which sits in the 914 now. a rotary engine i souped up so i am not afraid to tackle a tough job. i know that the m96 motor is a completely different animal than a Chevy v8 or aby poorsche1 - Main Forum
not good news, i spent almost an hour and a half trying to single out a pulley by spraying WD 40 and listening with a stethoscope but couldn't single out a pulley. i finally pulled off the belt to try one last time with no belt and i heard it. at 3000 rpm you hear a clattering sound at 3000 rpm. the other night with the belt off i didn't hear it but today heard plain as day with the belt off woby poorsche1 - Main Forum
well i couldn't work on it today much due to work, but late last night i couldn't sleep so i spent about an hour spinning pulleys every which way and trying to twist them to feel for any play or sound of a bad bearing but they all sound fine spin freely and no play to speak of except for the AC pulley. when i spin it, it spins freely sounds ok but when i grab it and pull down on it there is sligby poorsche1 - Main Forum
when i spin the alternator pulley clockwise it feels tight and i can not stop the fan inside but when i turn it counterclockwise it feels loose and i can stop the fan inside and still spin the pulleyby poorsche1 - Main Forum
question is the alternator pulley supposed to engage when spun one way and disengage when spun the other way?by poorsche1 - Main Forum
took off the belt and ran the motor first to make sure that the noise is not from inside the block, that way i will not cause any more damage if it was. and the verdict is that the motor sounded fine other than a small tick tick tick from the passenger side. now i will put belt back on and try to isolate which of the outside troublemakers it is.by poorsche1 - Main Forum
i was going to do that on friday. was wondering if i can rev the motor without the serpentine belt on to see if it is from the inside of the motor or the outside? i am not sure if there is anything that might get damaged if i rev it to 4000rpm a couple times with no belt?by poorsche1 - Main Forum
2001 boxster S this afternoon started to hear a rattling noise from the front of the motor when i drive. it is not there at idle but begins to resonate a fast clattering, rattling sound when i reach 2800 rpm and gets louder to about 3500 rpm. if i rev the motor i can hear it right behind me, always at the same rpm. what the hell can that be? I parked it until i can work on it. tried to insert aby poorsche1 - Main Forum