Question about 1998 Ford Expedition

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1998 Ford Expedition air struts keep deflating.

Air struts go down when parked and sometime when driving down hwy.
Pump works good.

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You can check it for a leak by getting into vehicle and close the door.Turn ignition switch to on position and shift the gear shifter to neutral.You will hear the compressor turn on.Once compressor turns on put back into park,leave ignition on and exit vehicle.Compressor will turn off when you open door but will turn back on after you close it. Now listen at each corner to see if you can hear where your leak is.

Posted on Feb 26, 2009

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Unfortunately, it sounds like the air compressor for your air ride system is not working. But before you replace make sure that the height sensors haven't gone out which would bleed deflate the bags. SunCore Industries has about the best prices for the air compressor, dryer and air struts and bags.

Changing them is no picnic, but there is plenty of information at SunCore on step by step instructions to do it.

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Mar 31, 2010 | 1998 Ford Expedition

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You have a pin hole between the compressor and the rear shocks/strut assembly's,or the compressor is not operating properly.Is the check engine light on? If so has the codes been checked ,and what is the code? To check the vaccum lines use soapy water ,The rearend is supposed to squat down during HWY. driving to be more aero dynamically sound. .

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it is probably the MAFS, the MAFS tells the computer how much air is coming in and if it is bad the ECU will not be able to work properly, it is an integral part of the system,

one way to check the MAFS is to unplug it and try to start the vehicle, if the problem is better then replace the MAFS


Edit: also try to clean the MAFS with brake cleaner, sometimes dirt and oil will cause a MAFS to act up, it may be hard to get to the sensor wires but if you take the MAFS all the way off of the vehicle and just spray the unit down well you should be able to clean any larger debris off of the sensor wire

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