92 lesabre MAP sensor

[Fred_Bear]

where is the MAP sensor located on a 92 Lesabre? Is there even one?

[Fred_Bear]

I relooked at the chiltons and code 34 has 2 entries. The other one is a low voltage fault with the mass air flow sensor. I'm gunna take a look at the filter and hosing to see if something is blocking it. Any checks I can do on the MAF before I replace it? How do I know if it is bad?

[spinne1]

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.

[stuzman]

Originally Posted by Fred_Bear

I relooked at the chiltons and code 34 has 2 entries. The other one is a low voltage fault with the mass air flow sensor. I'm gunna take a look at the filter and hosing to see if something is blocking it. Any checks I can do on the MAF before I replace it? How do I know if it is bad?

And here's a link from Autozone that will fully describe the process of checking the MAF for your vehicle with pics included...

http://www.autozone.com/servlet/UiBr...3d80178ed2.jsp

[Fred_Bear]

Thanks, I did the checks that spinne1 posted and everything checked out fine with the wiring. I removed the MAF (man those screws are a bear). I found the lower part of the plastic housing down in the hole broken. I super glued it back on thinking this was the problem. Reinstalled everything and the car is still throwing the same code (34). I then relooked at the manual and it said , with the car running to tap on the MAF with a screwdriver. If the engine stubbles or stalls you have a faulty MAF. I did that and it stumbles. I hate to think that I have a bad MAF because they are $128. But it looks like I do. Do you think that a junk yard one would be OK?

[stuzman]

Originally Posted by Fred_Bear

Thanks, I did the checks that spinne1 posted and everything checked out fine with the wiring. I removed the MAF (man those screws are a bear). I found the lower part of the plastic housing down in the hole broken. I super glued it back on thinking this was the problem. Reinstalled everything and the car is still throwing the same code (34). I then relooked at the manual and it said , with the car running to tap on the MAF with a screwdriver. If the engine stubbles or stalls you have a faulty MAF. I did that and it stumbles. I hate to think that I have a bad MAF because they are $128. But it looks like I do. Do you think that a junk yard one would be OK?

The junk item will probably be okay especially if the price is reasonable. If it was me, I would try that route first. Good luck with the repair!

[Fred_Bear]

I went to the junk yard and got the only one they had for $35 and they gave me a 90 return. I installed it and the car ran worse than the one that was in it. I think that one is bad or the wrong one. Looks like I'm gunna have to bite the bullet and buy the reman from the parts store.

[Fred_Bear]

I bought a reman from the parts store and she runs like a dream. Sucks to have to put $140 into a sensor but thanks goes to spinne1 for helping me diagnose the problem.