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Join Date: Aug 2002
Location: Northern VA
Posts: 666
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Splicing into the O2 sensor
I am getting ready to install a Air/Fuel gauge and I have heard different sides of the story on where to get the signal from. Some say, FRWilk, to splice directly into the sensor, others say to splice into the DME. What is the best route to take? I am sure some of you have done one or the other. If I go the direct to 02 sensor, where do you go through the firewall? Also, where do you connect to the 12v ingnition source for power?
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'08 BMW e90 335i 6MT stock [aka 'take two'] '12 Dodge Durango [family hauler] '86 951 (K&N Cone, Welt Chips, Tial, Zeitronix, P&P O-ring PH Head, WFHG, AFPR) [in storage] |
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09-24-2004, 09:46 AM
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Join Date: Jul 2001
Location: Edmonton, Alberta, Canada
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I find it easiest at the dme.
You may need to pull back the rubber boot....but its a nice clean connection.
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Alex - PCA Polar Region - Boxster Muncher 86' 944 Turbo - Megasquirt - 326 rwhp/340lbft @ 18 psi SOLD www.edmontonhomelife.com www.edmontonrealestate.ws |
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09-24-2004, 10:16 AM
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Join Date: Jul 2004
Location: Louisville KY
Posts: 143
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A/F gauge = light show
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1983 944 Copenhagen Blue MODS: ENGINE: Firebraid 9mm plugwires. Weltmeister Throttle Cam, Dansk exhaust. lo-temp thermostat & fan switch, aluminum radiator. SUSPENSION: H&R 250lb springs, KYB GR-2 struts(front) Bilstien Shocks(rear), Racing Dynamics strut bar, APPEARANCE: 15" Phone Dial wheels, a-pillar w/ VDO H2O and volts gauges. 1987 944-S Montego Black -needs your help |
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09-25-2004, 01:10 PM
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Location: Northern VA
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Quote:
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'08 BMW e90 335i 6MT stock [aka 'take two'] '12 Dodge Durango [family hauler] '86 951 (K&N Cone, Welt Chips, Tial, Zeitronix, P&P O-ring PH Head, WFHG, AFPR) [in storage] |
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09-26-2004, 06:55 AM
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don't cut factory wiring
go to autometer web site and get a generic O2 sensor for like $20..then drill a hole in your exhaust..as close to the stock sensor and run wires from there...way easier. I put in an electronic air/fuel mixture gaugge and it works great....you may have to get a fitting to weld into the hole you drilled for the sensor to screw into...go to an exhaust shop..they"ll probably charge you like $30 to do it
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09-28-2004, 07:29 AM
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Join Date: Mar 2004
Location: Knoxville, TN
Posts: 70
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I just installed a air/fuel gauge in my 951, but it isnt working properly. it shows nothing until about 4000 rpm, and then i get one red led, which is lean. could this be a faulty o2 sensor?
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09-29-2004, 05:31 PM
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Join Date: Feb 2003
Location: SF East Bay
Posts: 1,856
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The thing is, you want to make sure your gauge is showing the exact same signal that's going into the DME. The cable going from the O2-sensor to the DME is a coaxially shielded cable. This is to reduce interference from the ignition coils and anything else out there. Unless you replicate this exact cable with the same impedance when you hook up your gauge to the sensor, most likely you'll be getting a different signal than what goes into the DME. The only way to ensure that your gauge picks up the same signal as the DME, is to tap into the O2-sensor line as close to the DME as possible.
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10-01-2004, 09:57 AM
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Porsche 944
