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Registered
Join Date: Dec 2002
Location: Kentucky
Posts: 447
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Bypass Valve and Check valve and fuel milage
I can suck air throught the top of my bypass valve....that is bad right? Also the check valve on top of the firewall, how do i test it. Also I changed my oxygen sensor. I got a universal one from paragon for the 951 and installed it and now my gas mileage is horrible. I know there is 2 different colored wires. one is solid and the other 2 are both white. I dont think it matters which way the white ones go does it? If not do you think I just got a ****ty 02 sensor? Thanks guys...
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1986 951 1983 944 |
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08-29-2003, 12:37 PM
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Location: Richmond, VA
Posts: 484
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The white wires are the heater leads. The black wire is the sensor lead. DO NOT solder the black wire! O2 sensors use the sensor wire to "sample" the outside atmosphere, which is then compared to the amount of O2 in the exhaust gas. If you solder the signal lead, chances are you will seal the strands to the insulation and the sensor will not work properly.
Which check valve are you referring to?
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Cliff Hipsher '87 944 India Red '86 951 Kalahari Metallic |
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08-29-2003, 01:36 PM
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the check valve is all the way up ont the firewall close to the top. Its connected on the vaccum lines
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1986 951 1983 944 |
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08-30-2003, 07:55 AM
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bump
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1986 951 1983 944 |
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09-02-2003, 06:58 AM
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Join Date: Feb 2000
Location: Kingsport, TN
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"I can suck air throught the top of my bypass valve....that is bad right?"
If this is the circular valve located near the coolant reservoir, then you need to replace the valve. The valve normally remains shut. Vacuum opens the valve against a spring letting the compressed air reenter the compressor. The valve has a diaphragm in it. The nipple opens the valve. If diaphragm is torn, you are screwing up your vacuum control system.
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Lawrence 1986 951 2002 SLK32 AMG 1987 328GTS 2011 528i |
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09-02-2003, 07:24 AM
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