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00 V70 XC SE What's up with the security screws on the MAF?

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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1997 - 2000 V70-XC
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Re: 00 V70 XC SE What's up with the security screws on the MAF?

Post by EngineeringBloke » Sat Jan 12, 2019 2:51 pm

And the Bosch MAF sensor has a top mounted temperature sensor - the wire that forms a U-shape coming out from the sensor connector side, and the hot film air mass detection plate that is recessed in a duct within the sensor.

When cleaning a MAF sensor be sure to spray inside the duct near the tip of the sensor to clean the internal sensing plate. Do not touch any part of the thumb shaped sensor with fingers or the straw on the MAF cleaner.

The sensor measures the effect of the cooling of the air as it flows over the sensor plate which is heated and maintained at a temperature. The temperature of the air is measured by the other part of the sensor and factored in to increase the air mass based on colder air being more dense.

Bosch has an video showing the two sensors in the MAF. Also the duct in the MAF has a bypass hole to allow any solid or liquid matter to exit and not pass over the hot film plate. This aids in keeping it clean.

https://www.boschautoparts.com/en/auto/ ... ow-sensors

In fact, I am somewhat skeptical that cleaner will even make it to the hot film sensor. Still it is worth ensuring the temperature sensor is not dirty and out of calibration as a result.

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Re: 00 V70 XC SE What's up with the security screws on the MAF?

Post by erikv11 » Sun Jan 13, 2019 11:21 pm

I would also note that anecdotally, cleaning the MAF almost never makes a difference unless it is visibly oily. So I would never do it as a preventive measure. Cleaning the MAF is like putting in an aftermarket one - usually a waste of time and money.

'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 140k
'98 S70 NA, 205k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 275k
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