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Crank Position Sensors on the bell housing are known to go bad. These are cheap and easy to fix.. Not suggesting you randomly throw parts at the problem but had this happen on several M96's (my own and others').
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Although Spec Boxsters are based on the 2.5 liter 97-99 version of the 986 (and yours is an 3.2 liter S), you will find a lot of useful build info on the relevant forums. See here for an example: http://www.porscheclub.com/wp-content/uploads/2017/06/POC-2017-GCR-BSR-BSX-Boxster-Spec-Rules.doc.pdf I have driven a lot of street Boxsters on track and compared to full blown track cars (or very track focused street cars, eg GT3) the suspension always feels very soft. And stickier tires never hurt either. But once you start messing with these kind of upgrades, the slope get progressively slippery and before you know it you end up with something that's neither fish nor fowl. Your streetable track car ends up a horror to drive on the street, or your street car still leaves a lot to be desired on track. Something else to keep in mind that these M96 engines have top end oiling issues under higher lateral g-loading (in Boxsters that's bank 1 turning left / in 911's that bank 1 turning right), hence the allowance for an accusump in the race cars.
I'd do a little surgery first and remove the door panel for proper diagnosis, keeping previous post advice in mind. It could be that the glass pane has detached from its holder or a cable guide has popped out of its socket. Good luck and love to hear back.
When you say ventilators, I take it you are referring to the radiator fans upfront. From your description, the fan motors appear to be operational, so it must be something in the control electronics or the wiring to the fans. Proper diagnosis would require something like a Durametric cable & software, allowing you to activate each fan separately.
Hi Peter, the Hankooks you are using have a tendency to "cup" a bit when they are standing for a while. I have found that the issue is worse with lower psi's and in colder ambient temps, but goes away after a few miles of driving as tire temp goes up and centrifugal force rounds them out. I run these tires on 3 cars and apart from this issue I like them a lot. On your Boxster keep the cold pressures around 35 psi and see how that affects the vibration. Joost
See if there are any exhaust leaks before the cats, ie. from the exhaust side of the motor, down the headers to the cats. Any air that seeps in would dilute the exhaust gas and could fool the O2 sensors into thinking the engine is running lean...
Frayed wire making noise while going around the pullies. I got a salvage replacement part in good nick for less than $40.. Non-OEM replacement parts are pretty cheap too. Around $60 online..
CPS in my vocabulary stands for crank position sensor. Sorry for the confusion and late reply. Any luck?
I just replaced this one this weekend on my 99 Boxster after messing with it a couple of times (trying to revive it). The vacuum line should hold a vacuum and if not the diaphragm is shot. Mine DID hold a vacuum (suck on it real hard and you'll find out), but the diaphragm was stuck and the valve would not open, thus throwing a P0410 & 1411. Just curiouis what symptoms you are having.
Concur with JFP. Although I am not a fan of throwing parts at a problem, based on the info provided I would say it is most likely the CPS. The generic part is Bosch 0261210335 and can be had online or at your FOPS for a little over $100. Changing it out is not a major task; with the rear on jack stands and the right rear wheel off, you will need a hex socket (5mm) with a nice long extension (2 feet is good) to undo its bolt. See also: http://forums.pelicanparts.com/boxster-cayman-forum/593099-my99-boxster-crank-position-sensor-diy.html You do not need to remove the tranny, but the pic in this post shows location very well.
Thanks Dennis. PET does not have spearate parts for rebuilding the drive axles. Porsche only sells the whole enchilada. At $12.50 shipped each I ordered 4 boot kits from rockauto and look forward to digging into this. Will revert.