o2 sensor disconnected
05-03-2005, 10:15 PM
#1
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o2 sensor disconnected
Any idea what effect running an '83 944 with the oxygen sensor disconnected has on the car? Just curious, since my latest acquisition is running this way.
05-03-2005, 10:24 PM
#2
You will run costantly rich wasting huge amounts of fuel. You will foul the plugs and destroy the cat. Performance will be worse, not better.
The 944 runs at around 12:1 AFR before the lambda turns on at idle speed - not good for all the time.
How's that?
The 944 runs at around 12:1 AFR before the lambda turns on at idle speed - not good for all the time.
How's that?
05-03-2005, 10:28 PM
#3
Race Car
Special Tool is right. If you have to pass emmissions you may have problems as well. They are a relatively inexpensive fix. $30-130 for the part depending on which you buy, aftermarket 50 state or OEM Cali sensor, price is for part only no labor in there. Shouldn't be too tough to do as a DIY.
Michael
Michael
05-03-2005, 10:42 PM
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i do not work for craftsman, but i swear that i find a ton of their newer products seem to be silly....my mom and sister always buy me the new "neato" tools that seem that they would be the same as using conventional wrenches or sockets......BUT i use the craftsman clench wrench, and it is amazing!!! really does grip like hell, and i had no problem gettign any o2 sensor out yet.
05-03-2005, 10:47 PM
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Here is the flip side to what the others have said. I have an 84 that over the last year or so would run rich at idle, almost to the point of stalling. I finally decided to test the O2 sensor with the car running. I unplugged it to test the voltage and the motor smoothed right out and ran great. Go figure. I've been running it this way for about a month now and it's still running nice. The guy who disconnected yours may have experienced the same situation.
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05-04-2005, 12:17 AM
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Ok, ok, mine too is not plugged in, BUT the harness side of the connector is broken, the wires are there though, how can I hard wire this together? There is 2 wires on the harness side and I have no idea what is going on with the connector side.... Its an 83...
05-04-2005, 01:53 AM
#10
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whoa i have it disconnected as well...but for what reason i do not know. it was that way when i bought it. i too am interested in both the clench wrench and how to hard wire...please explain.
05-04-2005, 10:43 AM
#11
Three Wheelin'
If the O2 sensor connector is broken you can use either "bullet" or "spade" style connectors. If you use spade style connectors, get connectors that have a "hood" to keep water and junk out.
When you replace an O2 sensor, use butt style crimp on connectors, NEVER solder the wires together.
When you replace an O2 sensor, use butt style crimp on connectors, NEVER solder the wires together.
05-04-2005, 04:19 PM
#15
Three Wheelin'
It can be done with a "T" jumper and a DIGITAL Volt Meter.
To read the sensor and watch the output change, make a "T" or "Y" jumper to go between the sensor lead and the harness connector.
Connect the meter to the "T", set the meter to read the 2 Volt DC scale and start the engine. As the sensor warms up you should see at least 0.50 volts. When the DME shifts to closed loop control (O2 sensor out put is valid) the voltage should vary across 0.50 volts.
Readings > 0.5 = Rich, < 0.5 = Lean.
For later cars you don't need the "T" jumper. The connector is a soft rubber so you can insert the meter probe directly into the connector from the back. This is called "Back Probing".
To read the sensor and watch the output change, make a "T" or "Y" jumper to go between the sensor lead and the harness connector.
Connect the meter to the "T", set the meter to read the 2 Volt DC scale and start the engine. As the sensor warms up you should see at least 0.50 volts. When the DME shifts to closed loop control (O2 sensor out put is valid) the voltage should vary across 0.50 volts.
Readings > 0.5 = Rich, < 0.5 = Lean.
For later cars you don't need the "T" jumper. The connector is a soft rubber so you can insert the meter probe directly into the connector from the back. This is called "Back Probing".