Hi,
Interesting.... Porsche has a TSB out 9/00 1715 1 noting the Oil Filler Hose between the Crankcase and the Service Unit (Oil Filler in Trunk).
It says: "Oil Filler Hose can crack causing the following conditions:
- Check Engine Light
Oil Leak on the Crankcase in the area of the Oil Filler Hose
Rough running (rough idling, increased idle speed)
As a result of the incoming secondary air, the following Fault Codes may be stored in the DME Fault Memory: P1123 to P1130.
A new style hose was installed in Production as of August 18, 2000. In case of complaints, the new style Hose should be installed. PN# 996.107.254.03"
Sounds similar to what you're experiencing, especially with the sound you describe. Check the Crankcase for tell-tale signs, and if confirmed, send me a PM w/ your email Addy and I'll shoot you a copy of the TSB w/ replacement procedure.
There is also a TSB discussing
P1123 and noting the proper voltage range of the MAF. It says:
- MAF signal voltage:
- If the value is between 0.92 V and 1.08 V, no replacement is necessary.
- If the value is 1.15 V or above, replace MAF.
Run a test using a Multimeter and see what value it gives you. Hope this helps...
Happy Motoring!... Jim'99
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