[Boxster] Idle problem

[HolmaN]

The problem is continued in this thread: Idle problem - Part II




Greetings,
I've been browsing some other threads, and seen diffrent solutions (by suggestions), but never any reply with what worked and what not.

I've got a boxster from 1998, and problems with the AC. When I turn it on, the idle starts dropping down to 300-500, and as soon as I turn it off, it oes back to normal (800-900).
I've cleaned the mass flow sensor as well as the throtle body, but with no success. (this was before I notice it only happen with the AC on.)

The question: I've seen replies ragarding the sensor located on the throtle body, have anyone managed to solve the problem by replacing or cleaning it?
The first think that came to my mind was the compressor for the AC, it's not stuck, but it might be slowly dying. Have anyone solved it by replacing it or changing the filter / emty the oil etc?

That's the two things that came to my mind.
I appreciate the help!

With kind regards, Jonathan from Sweden.

[san rensho]

Did you clean the idle control valve on the TB? A dirty valve commonly causes your problem.

[HolmaN]

I haven't. I'll do it the first thing in the morning and come back to you. Thank you very much mate.

[HolmaN]

@san rensho, I cleaned the valve. However, it didn't help. Might even have made it worse.
Went to my porsche shop and they cleaned my fualt codes. I'll be going back to them within a few days with fresh error codes. As there was hundreds of them due to me pulling diffrent contacts while searching for the fualt.

I belive my generator can't provide enought power, but that's me. I got 2 after mounted fans, when I turn them on, the same thing happens as with the AC. (Noticed tihs today.)

[coolbreeze551]

Keep us posted on what you find out. Good luck

[luke1834]

I had a similar problem and the eventual solution was to replace the AC compressor. I was able to get one online and replace it myself (with the help of a friend). Not the cheapest fix, but was the end result of my efforts. Hope you get back to happy motoring soon!

[thom4782]

My guess would be an AC compressor bearing beginning to seize

[HolmaN]

I paid porsche another visit, for expertice. However, they told me that they never, atleast barly ever replace the AC compressors. They told me to replace this sensor, located on the throttle body. I've cleaned it with no success. (The sensor shown on the picture below)
A friend of mine from work, who currently is on vacation tho, promiesed me I could try useing his sensor before I order one, to make sure I don't spend money if I don't have to.
I'll try to get a hold of him as soon as he gets back.

[HolmaN]

Sorry for the double post. Somehow, the site got laggy and I managed to make two identical posts.

With regards, Jonathan from Sweden.

[HolmaN]

I borrowed my friends boster for an hour or two, and used his air flow sensor and the sensor located on the throttle body. But that didn't solve the problem.
Any further suggestions?