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How to reset Air Mass Flow (MAF) sensor adaptives? Topic is solved

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

2001 - 2007 V70
2004 - 2007 V70 R
2001 - 2007 XC-70
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GDiode
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Re: How to reset Air Mass Flow (MAF) sensor adaptives?

Post by GDiode » Fri Mar 10, 2017 4:17 pm

Would a clogged PCV system cause the stalling once the pressure builds up?
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JRL
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Re: How to reset Air Mass Flow (MAF) sensor adaptives?

Post by JRL » Fri Mar 10, 2017 10:07 pm

Possibly, especially if one of the vacuum lines is split
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GDiode
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Re: How to reset Air Mass Flow (MAF) sensor adaptives?

Post by GDiode » Sun Apr 23, 2017 8:46 am

So yesterday I was finally finished with my '04 V70. I had in the end replaced the MAF( but that hadn't fixed the whining or the stalling), the PCV system (I believe that fixed the whining do to the diaphram being split), cleaned the throttle body( it was really dirty) and replaced all but the larger diameter vacuum hose that goes from the intake manifold to a tree under the upper part of the engine. Took it for a test drive and everything worked just like it should. Thanks to all who helped point me in the right direction.
'96 855 NA 269,000
'94 854 Turbo 162,000 rebuilding the head after a burned valve
'95 854 Turbo parts car
'03 V70 XC 142,000
'04 V70 NA 230,000
'04 S60 NA 152,000 oldest daughter's car
2005 Mazda 5, 5sd 163,000
2001 Excursion 7.3 power stroke 135,000

jimmy57
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Re: How to reset Air Mass Flow (MAF) sensor adaptives?

Post by jimmy57 » Sun Apr 23, 2017 12:35 pm

You described something thats points to only one thing: the PCV box with crankcase pressure regulator valve is broken. The diaphragm on top of the box, used only on the non-turbo versions of your car, ruptures and puts crankcase in vacuum. The noise can be the valve "honking" or it s air coming in at shaft seals for cam or crank and making the kazoo noise. If you do glove test it will suck the glove down dipstick tube----DON'T DO IT!

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