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Old 08-13-2008, 11:10 PM   #1 (permalink)
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What I have: 1991 Sable 3.8L

It's not the sensor itself, as I substituted a known good one; code 176 continues to show up in continuous memory.

I tested the ground wire; there is continuity to ground. The sensor connector pins look good.

My desire now is to test the continuity of the "hot" wire that runs between the sensor and the ECM. However, I do not have a schematic for that: can anyone help me identify the corresponding ECM connecter pin?

Am I on the right track... is there anything else I should check?

Regards... Mike

P.S. My fuel economy is horrible. I'm assuming the computer is dumping loads of fuel in an attempt to correct a perceived lean condition.
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Old 08-14-2008, 12:25 PM   #2 (permalink)
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Does the engine run rough at all? Particularly at idle?

Here's some things to check:

An unmetered air leak (any way for air to get in after the MAF).
A Vacuum leak (which is also technically an unmetered air leak).
An exhaust leak before the O2 sensor (oxygen getting into the exhaust leak will pass by the O2 causing a false lean condition).

Those are the most common things that could cause a lean condition, and are fairly easy to check.
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Old 08-14-2008, 02:35 PM   #3 (permalink)
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I don't have schematics for the '91s but if you know the color of wire that the O2 sensor feedback signal is then look for this on the PCM connector. Them back probe the connector at that wire and monitor the voltage. It will take a good digital voltmeter but you can read the output easy enough.
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Old 08-15-2008, 11:08 PM   #4 (permalink)
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Thanks for the replies.

It evidently was a bad sensor after all. I tried a third one; that seems to have chased the fault code away.

Why they trigger the CEL on this car but not my other car, I don't know.

My fuel economy is still terrible in my opinion; around 13 mpg, mostly stop-and-go city type driving, and I'm a conservative driver.

It is smooth at idle as well as any other speed. Compression is very good, no vacuum leaks were found.

I have observed, however, that in the last couple of days, it seems to be developing what feels like an ignition miss. This occurs after about 3 hrs. of driving. I notice it the most at medium speed when the engine is under load. I suspect a possible weak coil or bad wires (they appear to be original).

I suppose that an occasional ignition miss does not enhance fuel economy, but could it cause it to be as bad as I'm getting? I guess I'll find out.

Regards... Mike

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