From: bob@pelicanparts.com on behalf of Bob at Pelican Parts [bob@pelicanparts.com] Sent: Tuesday, July 06, 1999 3:41 PM To: pelicanparts@csi.com Cc: John Ng Subject: Re: O2 sensor Hi John, The Porsche specification for oil consumption in the 911 series engines is one liter per 1,000 kilometers (about one quart per 600 miles). Having said that, most engines don't use that much. Some common causes for high oil consumption are: 1. Overfilling the oil tank. If you fill the tank full when the engine is cold, the oil level will be too high when the engine is fully warmed up and the oil expands. The engine will get rid of the excess oil either by burning it or spitting it into the intake, and making lots of smoke. Don't fill the oil level higher than the halfway mark when the engine is at operating temperature. 2. Valve guide wear. When the valves are adjusted, test for worn valve guides by pushing sideways on the valve stem with a screwdriver. Any detectable movement means the valve guides are worn. Yes, you can test the O2 sensor by heating it with a propane torch and measuring the electrical output with a multimeter. However, it is an inexpensive part and if you have to take it out to test it, it's better to just put a new one in. Hope this helps, Bob at Pelican Parts Wayne at Pelican Parts wrote: > Hi there. I'm not sure what the test is for the O2 sensor, but it sounds > like you might have other problems as well. 1 quart per 1000 miles is > quite a lot. Let me forward you to Bob in Tech Support, and perhaps he can > help you out. > > Thanks, > > Wayne > > John Ng wrote: > > > Dear Sir/Madame, > > > > I own a 85 911 Carrera with 106,000 miles on it. The problem that I > > am having is that when I start the car a plume of light colored smoke > > that is coming out from the exhaust pipe and it'll continue to that. I > > check my oil level every so often. I'll put a quart of oil for every > > 1000 mile. Also I noticed when I stop for a signal my RPM does not > > return to the normal position as quickly as before. I have a hunch that > > my oxygen sensor maybe broken. Is there a way that I can electrically > > test if the O2 sensor is bad? > > > > Thanks > > > > -- > > _______________________________________________________________________ > > > > >> \\\|/// > > >> \\ - - // > > >> ( @ @ ) > > >> +---oOOo-(_)-oOOo------------------+ > > >> | John Ng | > > >> | Product Development Engineer | > > >> | Sipex Corporation | > > >> | 233 South Hillview Drive | > > >> | Milpitas, Ca. 95035 | > > >> | | > > >> | Telephone (408)935-7605 | > > >> | Fax (408)935-7603 | > > >> | E-mail jng@sipex.com | > > >> | Web Page http://www.sipex.com | > > >> | ooo0 | > > >> | ( ) 0ooo | > > >> +---\ (----( )------------------+ > > >> \_) ) / > > >> (_/