I have a MY 1981 ROW 911 SC with a smog pump, no a/c and in totally original condition (f.ex. no pop off valve). It has done about 82 000 kilometers and it has been serviced regularly.
It was running just great but after 12th of May this year it all changed – it start losing idle: first for about a month or so if it was started cold it would idle very roughly about 300 rpm but if it was given a bit of gas it would idle after about 30 seconds OK on it´s own– if it was started warm it would idle just OK right from the beginning. After end of June it has mainly idled about 500 rpm but sometimes idles just normally ie. 950 rpm - if started cold it idles first about 1 800 rpm for a few seconds.
Spark plugs, distributor cap and rotor all look fine, a vacuum test didn´t show any leaks and there is also no gasoline leaks to see and if I pull the oil filler cap off the rpms drop a bit, no cracks on the air box, no back fire, besides the idle it runs just fine – so it always revs and starts fine !
The exhaust analyzer gave these results just a couple of hours before idle problems started:
CO 0.23
HC 10
CO2 12,70
O2 3.71 %
Since the nearest Porsche service is about 1 000 km´s from me I would really appreciate any ideas what could be wrong in my Porsche – even if it would not be better than a guess !
It was running just great but after 12th of May this year it all changed – it start losing idle: first for about a month or so if it was started cold it would idle very roughly about 300 rpm but if it was given a bit of gas it would idle after about 30 seconds OK on it´s own– if it was started warm it would idle just OK right from the beginning. After end of June it has mainly idled about 500 rpm but sometimes idles just normally ie. 950 rpm - if started cold it idles first about 1 800 rpm for a few seconds.
Spark plugs, distributor cap and rotor all look fine, a vacuum test didn´t show any leaks and there is also no gasoline leaks to see and if I pull the oil filler cap off the rpms drop a bit, no cracks on the air box, no back fire, besides the idle it runs just fine – so it always revs and starts fine !
The exhaust analyzer gave these results just a couple of hours before idle problems started:
CO 0.23
HC 10
CO2 12,70
O2 3.71 %
Since the nearest Porsche service is about 1 000 km´s from me I would really appreciate any ideas what could be wrong in my Porsche – even if it would not be better than a guess !
