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Old 05-12-2001, 01:01 PM
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Help interpreting data
I went to the DIY section and consulted my PM CD reagrding testing air/fuel mixture with a multimeter. I got results that aren't what I expected.

With the O2 sensor disconnected, it started out at 6.5V and the temp indicator on the instrument panel indicated typical operating temperature. After idling for several minutes, I noticed that the ranges were increasing so I unplugged the sensor again and the voltage had risen to 6.92V. The PM cd says it should measure 2.1-4.8V.

With the sensor connected, the voltage did oscillate. The range was +1.3V to +1.7V from the 6.92V baseline with the sensor disconnected.

I also noticed when I removed the air filter lid that the "choke plate" (?) was closed when the car was not running. Is that normal? On all my domestic vehicles, I believe the resting position was open.

Thanks again for the help.

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Old 05-12-2001, 02:58 PM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 11,235
I don't know what kind of car you have

but unless it is real old that isn't a "choke plate" and yes, it should be shut with the engine off.
'85 300D
'95 E320
'97 CRV

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Old 05-13-2001, 06:05 PM
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The car is a 1987 190E 2.3 8 valve.
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