986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - What are "correct" MAF and O2 readings at idle?

san rensho · 06-30-2016, 07:44 AM

From memory it should be 13-15 kg/hr. Your 10 seems low probably reflects a lvacuum leak also but its pretty small. You need to look at the fuel trims, they will tell you if the brain is compensating for a vacuum leak.

Vacuum leaks can be a pain to find.. Theres all kinds of places in the Auxiliary air system and in the evap system that can develop a vacuum leak and they are very hard to track down.

06-30-2016, 07:44 AM	#2
san rensho Registered User Join Date: May 2011 Location: Miami florida Posts: 1,591	From memory it should be 13-15 kg/hr. Your 10 seems low probably reflects a lvacuum leak also but its pretty small. You need to look at the fuel trims, they will tell you if the brain is compensating for a vacuum leak. Vacuum leaks can be a pain to find.. Theres all kinds of places in the Auxiliary air system and in the evap system that can develop a vacuum leak and they are very hard to track down. __________________ Current car 2000 Boxster 2.7l red/black Previous cars 1973 Opel Manta 1969(?) Fiat 850 Convertible 1979 Lancia Beta Coupe 1981 Alfa Romeo GTV 6 1985 Alfa Romeo Graduate 1985 Porsche 944 1989 Porsche 944 1981 Triumph TR7 1989 (?) Alfa Romeo Milano 1993 Saab 9000