My suv wont start

Asked by Chris Nov 11, 2018 at 08:41 AM about the 2002 Mercury Mountaineer AWD

Question type: Maintenance & Repair

I recently had engine light come on. When i
checked the code it came up p1400. I have
since replaced fuel pump, egr valve and dpfe
sensor. The issue is that my suv still wont
start. I can hear the fuel pump do its thing
and also the starter turn the engine..
Vacuum lines seem ok. Electric
wires/connections look good. What else
could it be that it's not starting?

3 Answers


things should be tested before replacing to save time & $$ , is there spark ? are the injectors firing ? some vehicles are particular about spark and fuel pressure , just having them won't do


A bad DPFE sensor will not cause the vehicle to fail to start. You obviously don't have a clue. I would recommend to stop throwing parts at it (very expensive) and take it to your local For dealership's service department for proper diagnosis.

Sensor was partially broken thus why It was replaced. I've had 2 mechanics so far tell me egr valve is bad. Fuel pump was original and vehicle has 247,138 miles. Pump wasnt making any noise when key was turned on. I had the relay tested and that was good. Fuel sprays out of fuel rail up top. I am currently checking all plugs for spark

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