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Car Forum / Porsche / Porshe 911 / February 2004'79 911SC O2 sensor
I have a '79 911SC that I have a hard time tuning. It has a test pipe and no O2 sensor. Is there any way I can tune it by the mixture adj. or fool it to get the mixture right? It smells like it is running rich. No matter how I adjust the mixture screw it doesn't smell right. Mike 79 and earlier 911's did not have 02 sensors. 02 sensor were installed on 1980 and later 911's. Do you let the engine reach it operating temperature before playing with the adjustment screws? The engine normally run rich until it has warmed up. You should check the plugs to verify that the engine is running rich. Black sooty plugs will indicate a rich condition. > I have a '79 911SC that I have a hard time tuning. It has a test pipe and > no O2 sensor. Is there any way I can tune it by the mixture adj. or fool it > to get the mixture right? It smells like it is running rich. No matter how I > adjust the mixture screw it doesn't smell right. > > Mike It is a California car so in '79 it had a cat and O2 sensor. I can see the receptor that the O2 wire connected to by the fuel filter. Yes I let it warm up. Any ideas on how to by pass the whole O2 sensor setup. How does the sensor change the mixture? Mike > 79 and earlier 911's did not have 02 sensors. 02 sensor were installed on > 1980 and later 911's. [quoted text clipped - 13 lines] > > > > Mike Mike - With the CIS system, there are a number of possibilities which could cause it to run rich. Generally speaking, the first thing to do is check your fuel pressures to make sure the system and control pressures are correct. If those are OK, it would pay to have it checked with an exhaust gas analyzer to find out where it's at and to set the O2. That's the only way to get the mixture setting correct, that I'm aware of. One other thought, which you can check fairly easily, is to disconnect the cold-start injector. These, and their sensors, have been known to fail. regards,  SignatureMark Hald '77 Carrera 3.0 http://members.rennlist.com/hald > I have a '79 911SC that I have a hard time tuning. It has a test pipe and > no O2 sensor. Is there any way I can tune it by the mixture adj. or fool it > to get the mixture right? It smells like it is running rich. No matter how I > adjust the mixture screw it doesn't smell right. > > Mike |
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