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Turbofreak
Dodge Dakota
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2/09/2005
17:29:42
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 Subject: DIY o2 simulators
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Message:
Hello,
Has anyone figured out all that is required to make an o2 simulator?
I hate to dump $60 just to get a resistor or something... like I could make myself if I knew what I needed...
Planning on changing or eliminating the stock Catalytic converters for higher flow exhaust system....
I know I have to keep the upstream O2 sensors in line to keep it fully closed loop... whereas I don't need a comparative 02 sensor after the cats...
Thanks!!
RYAN
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FLDak
Dodge Dakota
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2/10/2005
10:28:04
|  RE: DIY o2 simulators
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Bought mine from Thefastman, why re-invent the wheel? Easy install, no problems or MIL for downstream o2 sensors.
Hope this helps ya...
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Crow318
Dodge Dakota
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2/10/2005
13:00:02
| RE: DIY o2 simulators
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As a matter of fact, I did mine this past weekend.
I have been looking at my Check engine light for a year, and finally decided to take car of it.
Here is what you have to do.
Go to radioshak or equivalent and buy a 650k resister, and a nondirectional 1 microfarad capacitor.
When you get home, crawl under your truck and take a look at your rear O2 sensor connection. There are 4 wires. 2 for the O2 heater, and 2 for the sensor signal. Both of the heater wires on mine were white. Look at the o2 whip, not the vehicle harness. The sensor wires were black and grey. They vary model to model, so take your tester, and test the voltage on the 2 signal wires. The ignition has to be on. With the ignition on,one of the wires will get around 4 volts, with the truck running you should get near 5.
Note that 5V wire and then shut the truck off and remove the O2 sensor from the exhaust.
Strip a small section of the insulator off the 5V wire, and solder one end of the capacitor there.
Next, cut the other o2 signal wire and solder the resistor in line.
Then solder the other end of the capacitor to the o2 sensor side of the capacitor.
Cover everything back up with insulation. Make sure things aren't touching by doing a continuity test between the two wires at the connector. You should get no reading. I encased the whole thing in clear silicone and once that dried, I wrapped it with a little electric tape.
Put it back on the truck and you are all set.
Note:
1 - you have to put the O2 sensor back in the exhaust.
2 - The O2 sensor has heat resistant wire, so a small soldering iron is a bitch. I tried my cheap 25 watt one and it was too small. I had to use my 250 watt.
3 - Use lost of flux, it make the solder flow much better.
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Turbofreak
Dodge Dakota
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2/10/2005
13:12:19
| RE: DIY o2 simulators
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Message:
Thanks Man!!!!
I guess this will pretty much work on all vehicles with the after-cat comparative o2 sensor, correct?
Thanks again for your well-descripted directions and parts list...
Ryno
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bdholsin
Dodge Dakota
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2/10/2005
14:30:51
| RE: DIY o2 simulators
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For anyone who is interested in an O2 sensor simulator I have an extra one that has never been used. E-mail bdholsin@excite.com with the subject line o2 Simulator.
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Crow318
Dodge Dakota
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2/11/2005
07:32:27
| RE: DIY o2 simulators
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This will work for any o2 sensor, but you may need to change the resistor size based on the vehicle.
I know the fords like a 1,000 k instead of the 650.
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abraisive
Dodge Dakota
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1/30/2008
17:25:15
| RE: DIY o2 simulators
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this will not work with all O2 sensors
some sensors produce their own voltage (Most GM)
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why
Dodge Dakota
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1/30/2008
19:52:06
| RE: DIY o2 simulators
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in the hell R U responding to a post that is nearly 3 dam years old ?????????
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