2004 Buick Regal 3.8L
#1
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Good afternoon all.
I am working on this car and looking to verify my interpretation of my findings.
The car is stalling intermittently.
Service engine light came on.
I connected an OTC scan tool and pulled code P0102. Mass air flow sensor "A". Does this car have two MAF'*? There is a two wire sensor in the corrugated tube between the air cleaner and the housing that the MAF sensor is located. What is that? It has a "glass" bulb that extends into where the air flows.
The scan tool doesn't read any air flow, g/*. It reads 177hz, which I was able to verify, intermittently, with a digital multi-meter. Using the digital multi-meter, I also read 2.6VDC on the signal lines( yellow & black?) and 14 VDC on the feed circuit (red?) The voltage does not fluctuate when the idle is raised manually.
I removed the MAF sensor to clean it. The internals were shiny and intact. I sprayed some MAF cleaner on the four leads with no change in color. I believe it has been replaced with a rebuilt unit (the top cover seems to have been resealed). The MAF sensor is not OEM.
Am I missing anything?
I am leaning towards the MAF being bad, but am hesitant to change without knowing what the other sensor is.
Any help would be appreciated.
Thanks
Lou
I am working on this car and looking to verify my interpretation of my findings.
The car is stalling intermittently.
Service engine light came on.
I connected an OTC scan tool and pulled code P0102. Mass air flow sensor "A". Does this car have two MAF'*? There is a two wire sensor in the corrugated tube between the air cleaner and the housing that the MAF sensor is located. What is that? It has a "glass" bulb that extends into where the air flows.
The scan tool doesn't read any air flow, g/*. It reads 177hz, which I was able to verify, intermittently, with a digital multi-meter. Using the digital multi-meter, I also read 2.6VDC on the signal lines( yellow & black?) and 14 VDC on the feed circuit (red?) The voltage does not fluctuate when the idle is raised manually.
I removed the MAF sensor to clean it. The internals were shiny and intact. I sprayed some MAF cleaner on the four leads with no change in color. I believe it has been replaced with a rebuilt unit (the top cover seems to have been resealed). The MAF sensor is not OEM.
Am I missing anything?
I am leaning towards the MAF being bad, but am hesitant to change without knowing what the other sensor is.
Any help would be appreciated.
Thanks
Lou
#2
Senior Member
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MAF serves as an air meter and also IAT.
Tap the sensor and if the engine stumbles it'* bad. If it is ok with tapping doesn't mean it'* good.
Look at the FF and see if any PID'* stand out.
Tap the sensor and if the engine stumbles it'* bad. If it is ok with tapping doesn't mean it'* good.
Look at the FF and see if any PID'* stand out.
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#3
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Regrets for the late reply!
No PID'* out of wack except the MAF sensor. It was running at approximately 500hz.
I unplugged it and the car ran fine.
Purchased a GM reman MAF sensor.
Car started and ran fine.
New MAF sensor operated at approximately 2,600hz, 2.8VDC at idle.
Thanks
Lou
No PID'* out of wack except the MAF sensor. It was running at approximately 500hz.
I unplugged it and the car ran fine.
Purchased a GM reman MAF sensor.
Car started and ran fine.
New MAF sensor operated at approximately 2,600hz, 2.8VDC at idle.
Thanks
Lou
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#4
Senior Member
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True Car Nut
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Thanks for letting us know how it turned out!
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