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Air Mass Meter (AMS/MAF) Air Mass Meters play a vital role maintaining fuel economy. Faulty Air Mass Meters cause the ECU to default to a “safe map” which generally means your car is going to run horribly bad due to the excess fuel being funneled through your Volvo’s injection system. The Air Mass Meter depends on a few significant parts to ensure a longer operating life span. Volvo’s use a thermostat in the air filter box that controls a “hot/cold flapper valve” allowing hot air to flow through the intake to speed up emissions, especially on colder mornings. If the air box thermostat fails, the flapper valve in air box generally fails in the open position, allowing the pre-heat hose off the exhaust manifold, routing hot air through the intake system past the air mass meter. Electrical components don’t like excessive heat. The constant heat running past the Air Mass Meter will eventually cause the circuit board to crack, leaving the soldering board deteriorated and not able to function. IPD has many solutions in replacing and maintaining your Volvos Air Mass Meter.
ipd will not warranty any Air Mass Meter without the Air Box thermostat being replaced at the same time. Please check fitment listed below to ensure products will fit your specific vehicle. Some products may include or exclude some model years or engine and transmission combinations. The products listed on our website are for Volvos sold in the North American market. Many of the parts are exactly the same as those used in other markets, however we cannot guarantee fitment for those markets.
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1266826 Reviewed by Sern from Seattle, WA
The advice to replace this part is good and I wouldn't have thought about it or realized that it had such a big impact on the life span of the Air Mass Meter.
To install the part it is necessary, or certainly easiest, to remove the flapper valve assembly from the air filter box. You can leave the box itself in the car. There are three attachment points and the unit is freed up by squeezing the tabs together, which releases them from the box body.
With the flapper valve assembly out I put it in the vise, gently but firmly, and was able to compress the spring and plunger assembly towards the flapper valve, which is at the bottom of the box when installed in the car. This allows one to remove the old thermostat and slip the new one into the flapper valve assembly.
I was perplexed for a while by the addition of a small brass cap that was held on the thermostat shaft by a large rubber band, but it must have been there to protect the shaft end during shipping because it's too big in diameter to fit in the unit. The flapper seems to work fine without it. (It would have been helpful to have a note about this with the part.)
The installation was relatively easy and the effect on the operation of the engine from this thermostat and a new (rebuilt) Air Mass Meter was immediate. It runs as it should. I see that the Air Mass Meter has a three year warranty, which seems reasonable. I intend to try using the CRC cleaner I bought when I service the air filter.
March 2009
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