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2003 Expedition Stalls intermittently

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2003 Expedition EB 5.4 2wd. There are no codes. 169k This seems to happen every few hundred miles or so. The engine will just stall. I have had it happen once when I was moving slowly turning left, and twice while idling. Today when it stalled I noticed the check gas cap message came on the display. It has a new gas cap. A few weeks ago it refused to start and I could hear a buzzing sound (bad relay? Could it be related?) Buzzing seemed to be coming from the fuse box on the passenger side. I turned the key off and on again and it started fine.  I also notice a misfire when idling. But it is not registering a code yet. Thanks in advance. 

This topic was modified 2 days ago by jpalago
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Well you're kind of pissing in the wind without any data. The only way you can diagnose it correctly is to drive it with a scan tool hooked up on recording mode when it dies you push the button and it records the previous 20 seconds and 20 seconds after you push the button. Then you analyze the data but for my experience a lot of times it's a fuel pump if you have no codes that have to do with the car dying the fuel pump is off on the culprit is the computer has no idea what actual fuel pressure is

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Ok I will try to remember to use my blue driver to monitor until it happens again. Thanks Scotty! How does one go about buying you a beer or whatever you preferred drink is?

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Ok I will try to remember to use my blue driver to monitor until it happens again. Thanks Scotty! How does one go about buying you a beer or whatever you preferred drink is?

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