vacuum leaks
 

Any chance Idoling and sputtering can be caused by air vacuum leaks instead of the MAF. Where are the vacuum hoses located, and how can i test for leaks. When i open up the engine bay i can hear this loud sucking or blowing sound of air. Any clue??

Most idle issues are caused by a vaccum leak somewhere in the tubing that surrounds the engine.

From what I understand from experience and from other members, the MAF has nothing to do with idling issues, a bad MAF usually is diagnosed when the car has a lack of power or hesitation at speed.

So, use a can of carb cleaner (or opened, UNLIT propane tank) and spray around the engine compartment paying close attention to the tube routes. When the idle jumps, you've found your leak.

Be very careful using any combustible gas around the running engine. Be sure to have the car outside and if possible have an extinguisher within reach just as a precaution.

Also, invest in a Bentley Manual, especially if you plan on doing any work on the car at all.

It's very difficult to describe all the vacuum tubing and it's layout on the internet. The Bentley will show you in diagram form.

well problem is there are so many tubes going all around the engine bay, where do i start?? i don't want to just start spraying everything. thanks for your help guys

YES!!!
Be very careful when looking in your engine bay. This is the sound of $$$ leaving your wallet and being sucked into your Porsche. You must get used to this sound.

Sorry, couldn't resist. :D Now back to your problem....

My car had a vacuum leak from the previous owner letting the car sit, and having some fluid crystalize. I am sure you could do it yourself, and I am not sure the extend of your vacuum leak, but my leak took about a week to fix. I wouldn't try and fix it myself, unless I had a garage full of tools, and a lot of free time. :cheers:

Invest in a smoke machine and hook it up to the intake system that will test everything up to the throttle body,for a leak that is. Leave the car off and let the smoke machine build up,if anything lets it get threw bingo you found your leak!

That's all I know how to smoke test.