Question about 1992 Buick Park Avenue

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What would cause a 92 Park Avenue to have a rich air fuel mixture

The car sudenly started runing bad, will not idle and is dificult to start. I have to releve some of t he fuel presure while it is being cranked to get it to start. I is rining very rich. I tride changing the fuel presure regulator and the O 2 sensor, nether one helped.

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The MAF could cause this, so can the Crank sensor.

You might want to try cleaning the MAF sensor wire with MAF cleaner before testing. Of course, a scan tool is the best method of testing. A full function scanner will show air flow in terms of grams of air per second (gps), with a range from 3gps to 150 gps. The MAF sensor produces a frequency output between 32 and 150 hertz.

The harness to your MAF sensor is three wires labeled A, B, and C. (it is that thing near the air intake area) It has a pink/black wire (C), a black/white wire (B), and a yellow wire (A). Wire C goes to a fuse in the relay center under the passenger side dash. Wire B goes to ground. Wire A goes to the PCM.

First thing: check the wires and harness for trouble; second: disconnect electrical connector, turn key to ON position, engine stopped. Read voltage between wire A and ground. It should be between 4-6 volts.

Is it? If yes, connect test light between wires B and C. Light should be on.
Is it? If yes, you have a faulty MAF sensor connection or sensor.
If no, connect test light between C and ground. Test light should be on.
Is it? If yes, the ground wire (B) has an open. If no, the pink/black wire (C) has an open.

If the voltage was not between 4-6 volts above:
- If it was less than 4 volts, either the yellow wire (A) is open or shorted to ground, or you have a faulty PCM.
- If it was more than 6 volts, the yellow wire (A) is either open to voltage or you have a faulty PCM.

Wire A goes to the PCM.
Wire B goes to ground.
Wire C goes to a fuse in the relay center under the passenger side dash.

Remember, you are checking for proper voltage going to the MAF sensor. If the voltage checks ok going to the MAF, then you have a problem with the MAF. If not, you have wiring, connector, fuse, or PCM problem.

You'll can checked the AC Delco web site for the part and the MAF for a '92 PA is either 213-230 or 213-1619. For the '92 PAU the number is a 213-231 or 213-1620. I didn't check Rock Auto, but they're pretty good on the cross references.

Good luck.

Posted on May 28, 2010


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