Mass Air Flow

[zerotosixtyin4]

I recently purchased a 2003 XC70 I love the car...until it just up and died without warning.

I did a little research and it came back to the MAF sensor being a primary suspect. I unplug the sensor...viola...back up and running. So I went the cheapy route and got the "made in China" unit...that didn't work. So then I went OEM Bosch...and still no luck..as soon as I plug it in...the car stumbles and dies. So I am left with the prospects of having a unit go bad and then getting two bad replacements...or I am totally missing a step in the process of diagnosing this issue.

Any input on where I should go from here or what I have done wrong would be greatly appreciated...I am completely out of ideas here...every other vehicle I have ever had...if you had a problem like this and then the problem goes away when the MAF sensor is unplugged...replace the MAF...not so much luck this time around.

Thanks in advance

[hoonk]

Check engine light or any messages, any codes stored? - That would be a good starting place.

As far as other things - maybe a very large air leak in the intake system could cause that. (hose popped off under boost?)

[surfercalavera]

I am not 100% sure, but I was warned about unplugging the MAF without doing the proper sequence of doing a key combination to shut down the computer. I was also warned that if you replace it, you have to take it to the dealer to reprogram the computer to the MAF.

When I replaced the PCV system, I had to remove it and start it right up!



I recently purchased a 2003 XC70 I love the car...until it just up and died without warning.

I did a little research and it came back to the MAF sensor being a primary suspect. I unplug the sensor...viola...back up and running. So I went the cheapy route and got the "made in China" unit...that didn't work. So then I went OEM Bosch...and still no luck..as soon as I plug it in...the car stumbles and dies. So I am left with the prospects of having a unit go bad and then getting two bad replacements...or I am totally missing a step in the process of diagnosing this issue.

Any input on where I should go from here or what I have done wrong would be greatly appreciated...I am completely out of ideas here...every other vehicle I have ever had...if you had a problem like this and then the problem goes away when the MAF sensor is unplugged...replace the MAF...not so much luck this time around.

Thanks in advance

[JRL]

Nope, not a MAF
Plug and play

(Where do you read or hear this crap)?

[cattlecar]

If you have an air leak between the MAF and the turbo you will have the same symptoms. Low MAF value yields low injector fuel flow. Unplugged causes a substitute value and it will run. Look and make sure you are free of any problems from MAF down to turbo.

[surfercalavera]

The dealer! :0


Nope, not a MAF
Plug and play

(Where do you read or hear this crap)?

[antonumillard]

The dealer! :0

They always say the nice things... :mad: