Now that the temperature has dropped in KC I note that when I start my car in the morning (or afternoon if its still very cold outside)) it makes a loud "wheez" noise for a second when it starts. Sounds kind of like a reed valve or like when you fold a leaf over to use as a whistle. I replaced my AOS last year (only about 17k miles ago) so I doubt that would be the cause, any other ideas?
Cheers,
Julian
I wonder if the
987.1
has Secondary Air Pump?
looks like it does, I'll look into that!
My E46
BMW
330i had the same noise you described due to failing secondary air pump. Replaced it, fixed it. Try to locate first and check if noise if coming from there.
I looked up videos for "failing secondary air pumps" and the jet engine sound isn't what I'm getting, mine also only lasts a 1 to 1.5 seconds.
The secondary air pump noise on my
BMW
lasts 20 seconds. If your 987 last only 1.5 seconds, it might be something else but worth looking into the SAP. The SAP is only for emission control during cold start up, I lived and drive my car for 3 months like that before changing it.
My 2011
Boxster
started making the same noise for about a second or less during this cold snap and I think it is the starter dragging. I have had this issue before on non-
Porsche
vehicles, but I assume the starter works the same way. The grease on the shaft gets thick and the starter gear doesn't kick out fast enough to clear the flywheel and it spins the starter motor for a second. My noise goes away quick as the car warms up some.
Yours may be a different noise but it's something to think about.
Hmmm, I like this ^^
I'll drive the car again tomorrow now the road salt is gone away and see what happens (well above freezing now after that arctic wave)
I think it is the starter. I had this on my
987.1
before I replaced it. Does it sound like this? -->
exactly like that. Thanks for the video link!
I believe he neglected to mention disconnecting the negative battery cable BEFORE starting this project... that's important!
