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Everything I know says you broke it, but,
Posted by JohnB (more from JohnB) on Mon, 24 Oct 2005 07:38:50
In Reply to: O2 sensor question for Anders , Ari , Fimum Fit & all, John Daikh, Mon, 24 Oct 2005 02:40:11
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here is a test you CAN run with the sensor out of the car:
Use a high impedence DC voltmeter. Clamp the sensor in a vice, or use a plier or vice-grip to hold it. Clamp your negative voltmeter lead to the case, and the positive to the output wire. Use a propane torch set to high and the inner blue flame tip to heat the fluted or perforated area of the sensor. You should see a DC voltage of at least 0.6 within 20 seconds. If not, most likely cause is open circuit internally or lead fouling. If OK so far, remove from flame. You should see a drop to under 0.1 volt within 4 seconds. If not likely silicone fouled. If still OK, heat for two full minutes and watch for drops in voltage. Sometimes, the internal connections will open up under heat. This is the same a loose wire and is a failure. If the sensor is OK at this point, and will switch from high to low quickly as you move the flame, the sensor is good. Bear in mind that good or bad is relative, with port fuel injection needing faster information than carbureted systems. ANY O2 sensor that will generate 0.9 volts or more when heated, show 0.1 volts or less within one second of flame removal, AND pass the two minute heat test is good regardless of age. When replacing a sensor, don't miss the opportunity to use the test above on the replacement. This will calibrate your evaluation skills and save you money in the future. There is almost always *no* benefit in replacing an oxygen sensor that will pass the test in the first line of this paragraph.
Notwithstanding all of the above, about the only sure way to test an 02 sensor is in situ with an oscilloscope or scan meter.
posted by 68.55.24...
Posts in this Thread:
- O2 sensor question for Anders , Ari , Fimum Fit & all, John Daikh, Mon, 24 Oct 2005 02:40:11
- Re: O2 sensor, John Roberts, Mon, 24 Oct 2005 15:38:38
- Re: O2 sensor question for Anders , Ari , Fimum Fit &, SWEDECAR
, Mon, 24 Oct 2005 09:01:11 - Everything I know says you broke it, but,, JohnB, Mon, 24 Oct 2005 07:38:50 <-- Viewing This Message
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