MAF issue

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Jun 13, 2019 | 07:08 PM

Gjcb1976

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MAF issue

Hey, all... I've used this site a few times in the past to diagnose issues with great success, so I figured I'd try again. I have a 2003 Excursion with the V10. A few months about it started to die pretty consistently while driving (sitting at a stop sign, slow driving, and highway speeds) I cleaned the MAF, idle air control, throttle body, and put a new fuel pressure regulator on it. It ran great for 4 months. This weekend it started with the same issue. (Dies every 2 miles or so) I decided to take it one step at a time. I disconnected the MAF and it ran great for the past few days (100 miles or so) so I decided to buy a new one. I put the new one on today and within 10 miles it died again. Unplugged it again and it runs fine. I feel like once I plugged it in it must've triggered something. Any suggestions??? Thanks in advance for your help.

Jun 14, 2019 | 07:42 AM

Dave's here

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When was the last time you changed the fuel filter ?

Jun 14, 2019 | 12:26 PM

projectSHO89

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From: St Louis

Check your fuel tank vent system. If you can, the next time it stalls and doesn't restart, open the gas cap an listen for an inrush of air.

The whole MAF thing may be a red herring. Of course, it would be wise to actually check the MAF sensor's output to see if it's normal or not before reaching a conclusion one way or the other.

Jun 14, 2019 | 04:00 PM

Stewart_H

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From: Central Coast of CA

Moved over to the V10 forum since this is engine specific.

Stewart

Jun 14, 2019 | 05:50 PM

Gjcb1976

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Thanks, guys! I changed the fuel filter about a month ago. I'll definetly check the vent too. It's just so weird that it will not act up if the MAF is unplugged.

Jul 31, 2019 | 09:44 PM

Gjcb1976

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Problem solved!

Hey all, I just wanted to update you on the remedy because I hate leaving a thread open like this. The short answer is, the problem was the fuel pump relay. It is soldered into the fuel box on this year of Excursion. Instead of replacing the entire panel, we bypassed the fuse box and ran a new inline fuse and relay. It runs great now! Thanks for all of your advise, it was much appreciated.