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Oil Build up on Pipes - AOS / Throttle Body / MAF

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Ive had my ride a 2000 Boxster Semi Auto for about a year now and finally took a look at the engine.

Attached are the two pictures showing oil build up over pipes A and C. Does anyone know if this points to any problem in particular like replacing the AOS or cleaning the throttle body.

The Durametric error codes are as follows;

Error Codes P0102 P0107 P1126 P1133 P0300 P0302

Also is the throttle body shown in the picture labelled D as I will most likely open that up and clean it with CSR CO Contact cleaner which I think is also ok to clean the MAF with? Can anyone confirm that?



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We have had reports that using contact cleaner on the MAF can cause problems.

A couple folks here here tried it and ended up buying the MAF cleaner to "clean the contact cleaner" off the MAF.

Thanks Loren, I will hunt down MAF cleaner or just replace it, mine is the older 124.00 part so they are cheap enough.

Do you know if CO cleaner is any good to clean the throttle body? and is the throttle body D in the picture? As it was the first time I had opened the engine I was so tempted to spray the MAF especially after buying the security torx set, glad I resisted, but cant wait to get better performance. It really seems to has lost responsiveness up to the 4000rpm mark, it just hesitates, ALSO on occassion with cold starts it can shudder, smoke and on the very odd occasion mis-fire as reflected in the fault codes.

Do you know what the pipes labelled A and C are actually called and at how many kilometres they should be replaced? Do you think that both pipes being coated in oil on the outside points to any specific problem? Should I bother replacing or cleaning those pipes?

Looking at the pictures again I wonder even if the AOS needs replacement, from the top side of the AOS parts and Y tube they appear to not have any oil leaks on outside of any of the AOS parts, unlike the oil you can see on the other 2 pipes in the pictures A and C.

My ride has done about 82,000 kms :D

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  • 9 years later...

When you say lost responsiveness up to 4000rpms...does it wind up and take off after that? That’s my issue right now ...very sluggish and then screams in each gear after 4200 rpms! I can’t figure out why?

2000 Boxster S 3.2 manual transmission 

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