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Originally Posted by Highlow (Robo-Top)
A month ago I was getting 1128 and 1130 codes so I replaced the MAF.
Two weeks ago I was getting smoke on start-up so I replaced the AOS. No more smoke.
Now the Boxster has:
1. A rough idle. When stopped, the rpms go back and forth from about 600-800.
2. I have a slight loss of engine power and a high pitched whine (not very loud at all) when the engine is cold. This issue goes away when the car is driven for a few minutes.
3. The car has a tiny bit of trouble starting sometimes. Just barely, but you can tell something isn't right.
I cleared the codes this morning after I replaced the AOS. Now I have to wait for some codes to appear so I can see what is wrong.
Any ideas?
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The high pitched whine is probably your Secondary Air Injection system, the pump runs for a few minutes when the motor is cold.
As for the rough idle you might have a vacuum leak (should get a trouble code of some kind). If you don't get a trouble code after a couple hundred miles I recommend cleaning the injectors and induction system, I have done this a couple times (same issue you are having). The pro shops can do this or you can purchase the cleaning systems [url]http://www.bgprod.com/products/products.html[url].