EGR pressure sensor not bolted down

Tiny
FABAINEC
  • MEMBER
  • 2004 FORD EXPLORER SPORT TRAC
  • 4.0L
  • 6 CYL
  • 2WD
  • 150,000 MILES
Well, looking under the hood the EGR pressure sensor is not bolted down. The vehicle is having issues with stalling at stop lights, and sometimes have to push inertia switch to make start again. New relays, new fuel filter, and tune up. Was getting rich fuel codes on both banks, but those went away after tune up, and haven't come back, but running really bad.
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Wednesday, December 1st, 2021 AT 1:40 PM

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Tiny
AL514
  • EXPERT
The inertia switch is for if the vehicle is hit in an accident, it shouldn't be tripping the circuit on its own. It's to only shut off fuel supply if the vehicle is hit hard. So, to start with it look like you have a failed inertia switch. There are also have been many cases where the Inertia Switch and the fuel pump fail at the same time, or its the switch that fails and the pump follows. I'm not exactly sure why this happens. But you should replace the inertia Switch first and see how the vehicle runs. If it's still stalling out, you'll need to check the fuel pressure and see if it's dropping off causing the stall out. There is a fuel pump driver module in these vehicles that fail a lot too but change the Inertia Switch first. That definitely shouldn't be tripping like it is. I've added a diagram of the fuel pump circuit so you can see what's involved. Are you still getting any codes at all?
As for the DPFE Sensor, which is a pressure differential sensor for the EGR valve, what exactly is the issue with it? Can you bolt it back where it was?

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
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Wednesday, December 1st, 2021 AT 7:08 PM

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