Question about 1998 Ford Expedition

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1998 Ford Expedition wont stay running

I have a 4.6L V8 1998 Ford Expedition. It has been running fine with the exception of a mass air flow sensor reading on our check engine light. And I was told that would just make our engine run rich but wouldn't hurt true performance. Then yesterday I got in it and went to start it and it will run as long as you keep the pedal pressed down but as soon as you take it off it dies fairly quickly. I changed the fuel filter, and it sounded like the fuel pump was working when I listened for it in the tank. It sounds like gas is getting to the engine so I have no idea what else it could be. Any ideas?

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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

Posted on Oct 13, 2008

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