paulo986

I've a Boxster S 6 speed manual MY00 USA with 25k miles. I bought it with about 15k miles on it and have always had the following problem. I've researched it here, but have come to no solution. I think it's been alluded to, but not specifically addressed. Here goes:

No unusual noises upon startup at any speed/rpm, but after it's warmed up it starts making a howl or whine that seems to be vibration based. Here's the kicker. It does it at about 2000 rpm and will go away under 1900 or above 2100 rpm. I've changed oil and filter and thought I had it licked, but to no avail. But, methinks it's hydraulic pressure relief valve related Kind of like you can rattle or vibrate your water pipes in your house when you snub down your outside faucet. I'm almost thinking there was a tech note on this board on replacing some spring in the oil distribution system, but I'm old and could be wrong.

Any help would be much appreciated, since now I drive WAY over 2000rpm and the whine is coming from the passenger seat.

I have a 2000 boxster 2.7 and it makes the same howl. I have had the car for 3 years now and it is disturbing the irregularity with which this sound appears. Sometimes with top up -not aleays. Sometimes top down-not always. Sometimes if I turn on the AC it goes- you get not always.

I have asked numerous mechanics and one has given me a proper answwer. I believe it is a harmonic resonance from air intake. I am using a K and nfilter . But if you find out, I would love to know.

I am having a problem with a horn sounding when brakes are applied or if you push on the steering wheel?

I have noticed a similar clear fluid leaking from the same area. The fluid feels somewhat oily to the touch, but has little smell? I have no idea what this is if you find out . please post.

I got a CEL and when I hooked up the Durametric It gave the following fault codes; P1126 FC 35, P0445 FC 94, aqnd P1124 FC 27. The P0445 lists as a major leak in the tank vent system. Was this a matter of a gas cap not properly closed? If not, any ideas? Thanks in advance for your help. Ed 98 Boxster Tip 53K

I had the same fault code and it ended up being a faulty maf sensor. I had this replaced and the car is running great.

paulo986

I have a 2000 Boxster with 91,000 miles and it is in the shop at this very moment with one of the issues being this whine. I get it around 2800 rpm on occasion . Seems less with ac on. It sounds like it is comong from under the dash on the passenger side. It is really annoying kinda harmonic and stays in a narrow rpm range. If anyone knows what this is i would love to know.

paulo986