04 Volvo XC90 6 Cylinder Stalls [ blue streak aftermarket junk MAF ] Topic is solved

[MRScott]

I think you need to find out why the signal is at zero grams a sec. The motor will still run with a dirty MAF. It could be covered with oil and dirt and still run. The signal is dropping out and that's were you should be focusing your energy. Clean or dirty. it should have a signal

[diydad]

Here is the most recent thing I have noticed after clearing the code. I am only getting signal when the motor is cold. Just shut her off and I am going to run the tuner once again after cool down to see if the MAF functions. Have had varying times that the MAF is functional from 7 min up to 20 min.. The common denominator I have noticed so far is that it cuts out around the time the engine warms up to operating temp. I am going to run a continuity test on the wires in order to see if a short does exist but I have checked them once already. Could this be heat related or maybe a malfunction with the computer?

[RickHaleParker]

No DTC’s but the P0102 did pop back up.

ECM-121D (P0102) Mass air flow (MAF) sensor. Signal too low

Diagnostic trouble code (DTC) information ECM-121D

Condition
The engine control module (ECM) calculates the expected mass air flow. The calculation is based on a number of different parameters. The calculated value for mass air flow is then compared with the measured value from the mass air flow (MAF) sensor.
The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects that the value for the measured air mass is lower than the calculated value for air mass.
The diagnostic trouble code (DTC) can be diagnosed when the engine is running.



Substitute value

• Calculated boost pressure
  Calculated air mass
  Rear heated oxygen sensor (HO2S) control shut off
  Misfire diagnostic shut off.

Possible source

• Air leakage in the intake system
  Contact resistance in the mass air flow (MAF) sensor connectors
  Short-circuit to ground in the signal cable
  Open-circuit in the signal cable
  Open-circuit in the power supply
  Damaged mass air flow (MAF) sensor.

Fault symptoms
Malfunction indicator lamp (MIL) lit
Poor performance.

[RickHaleParker]

The common denominator I have noticed so far is that it cuts out around the time the engine warms up to operating temp.

Metal expands when it warms up. Hum .. Electrical connectors marginally loose when cold loosen up and lose contact when warmed up? It would not be the first time tightening the metal contacts in a electrical connector did the trick.

[diydad]

Thanks guys for all the great advice! I am happy to say that the issue is finally resolved. After I retraced all the wiring and tested, I still could find no fault in the wiring or the connectors. After process of elimination I decided that it was worth a shot to put in a an oem MAF Sensor. Bosch sensor came in yesterday and after it was installed the motor ran perfectly. It has run perfectly without stalling issues since then. Note to self: NEVER put an aftermarket MAF Sensor in this vehicle. I thought that I would get a reputable part from Oreilly Auto Parts and they sell a MAF by a company named Blue Streak (JUNK). Tried multiple times to call Blue Streak to as questions about the design of the product. Never received a return call or any explanation as to how their MAF sensors work. Hopefully this helps someone who is banging their head against the wall with same problem. Go OEM

[abscate]

Added resolve to title, another bad 3rd MAF identified