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Hayestack

Erratic idling cured, better brakes too

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Hi All

I was fairly sure that my erratic idling on my 2000 model Boxster S - never less than 1100 r/min and often shooting up intermittently to 2000 r/min - was caused by a dirty throttle body or  MAF sensor. After cleaning the TB it made no difference and having caused an air leak on one of the rubber sleeves where it attaches to the plenum, I decided to give the job to my local specialist.

The problem was resolved by repairing a hole in the brake vacuum hose, caused by the hose chaffing against the bodywork.

I suppose that with 19 years under its belt and 147000 km I could expect something like this. The brakes work better too - less muscle required to stop the beast!

Thought Id share...  

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'Fraid not as I didnt discover the problem but I have to visit my technician again tomorrow so will ask him to point it out.

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Regarding the repaired brake vacuum hose. I wasn't able to talk to the technician after all, but did take a look under the top engine cover. The vacuum line runs from the inlet manifold right through to the servo located under the front bonnet (trunk). I wasn't able to see where the repair was made - it could have been anywhere along this line. Perhaps the line wasnt properly connected to the inlet manifold? Its a sizable pipe and made of tough material - not easy to damage. 

Good hunting - if you think this could be your problem.

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