2002 explorer crank no start

[KONxKOE]

I have a 2002 ford explorer 4.6l .. I have a crank no start issue. I have replaced the fuel pump, I can hear it turning on and priming with the key, but no fuel pressure on the rail. I have replaced the fuel filter as well.. still no pressure on the rail. I hit the Schrader valve and I am getting fuel at the rail just not enough pressure to move my gauge.. I pulled the fuel pressure sensor off the other rail and again tested the key and I’m getting fuel there as well.. the fuel injectors are getting power and I will be noid testing it tomorrow to make sure they’re pulsing correctly.. i have checked the inertia switch and its not flipped.. I have sprayed starting fluid in the throttle body and it starts up immediately.. kind of at a loss any ideas??

 

[wollimann]

Any OBD Diagnostic Trouble Codes?
If it starts with starting fluid it is a good sign, so crank sensor, ignition and savety system seems ok i would say.
If you hear the new fuel pump (changed only pump or whole unit?) running at startup, why it produce no/not enough pressure or where is the pressure loss? Maybe it's a issue with the fuel rail pressure sensor or the fuel pump driver module...
Did you still do a PCM reset, battery off/on?

 

[Mr Mumbles]

Was there low pressure to the rails with the old pump to? If so, the pre-filter inside the tank might be plugged.

 

[KONxKOE]

Was there low pressure to the rails with the old pump to? If so, the pre-filter inside the tank might be plugged.

Yes very low / no pressure with the old pump which is why I changed it in the first place.. I changed the entire fuel pump assembly

 

[KONxKOE]

Any OBD Diagnostic Trouble Codes?
If it starts with starting fluid it is a good sign, so crank sensor, ignition and savety system seems ok i would say.
If you hear the new fuel pump (changed only pump or whole unit?) running at startup, why it produce no/not enough pressure or where is the pressure loss? Maybe it's a issue with the fuel rail pressure sensor or the fuel pump driver module...
Did you still do a PCM reset, battery off/on?

The only codes I’m getting are bad 02 sensors and bad maf sensor which neither would make it a no start.. changed the whole unit for the fuel pump.. and i took the fuel rail pressure sensor off it looks okay like it’s not plugged up or anything but idk.. the fpdm I wasn’t sure if my model actually had I’ve seen mixed things trying to google that.. where would it actually be on the truck?

 

[Josh P]

I don't own a 3rd gen. Could this be a pats issue?

 

[KONxKOE]

I don't own a 3rd gen. Could this be a pats issue?

I don’t believe so I would think with a pats issue I wouldn’t be able to start it with an outside fuel source right? I got a new key programmed for the truck since the old key was lost but idk.. do I need more than one key programmed?

 

[Josh P]

I don’t believe so I would think with a pats issue I wouldn’t be able to start it with an outside fuel source right? I got a new key programmed for the truck since the old key was lost but idk.. do I need more than one key programmed?

Has the car ever started with the replacement key? Does the red light on the dash blink rapidly when you crank it?

 

[KONxKOE]

Has the car ever started with the replacement key? Does the red light on the dash blink rapidly when you crank it?

No I have no theft light going off and it has never started for me period I bought it as a no start with no keys.. however like I said before- if I spray starting fluid in the throttle body it starts up IMMEDIATELY first turn so I believe it’s some sort of fuel issue but it has a new pump, new filter, the relays and fuses appear to be fine and I have swapped them from other fuses and relays of the same size and power just to be sure.. all of that is good… I inspected the fuel lines going from the rail to the tank they appear to be fine.. so I’m just at a loss tbh.. the injectors I will be noid testing tomorrow and other than that I guess the only other thing could be the regulator

 

[Josh P]

The pats disables the injectors on all vehicles with it but the starter is not disabled on all vehicles. The starting fluid only rules out the ignition if the pats does not disable the starter.

 

[KONxKOE]

The pats disables the injectors on all vehicles with it but the starter is not disabled on all vehicles. The starting fluid only rules out the ignition if the pats does not disable the starter.

How could I test if it’s the pats? And if it is what could I do to get around it or fix the issue?

 

[KONxKOE]

The pats disables the injectors on all vehicles with it but the starter is not disabled on all vehicles. The starting fluid only rules out the ignition if the pats does not disable the starter.

I just did some digging and it looks like for my model if the pats is messing up it won’t crank either.. the pats will make it a no crank no start issue according to everything I’ve seen

 

[Josh P]

How could I test if it’s the pats? And if it is what could I do to get around it or fix the issue?

There's a receiver around the ignition that goes to the pats module which then goes to the GEM module. The lack of a flashing red light makes me think there might be an issue with one of the modules. A tuner can disable the pats.

 

[Josh P]

I just did some digging and it looks like for my model if the pats is messing up it won’t crank either.. the pats will make it a no crank no start issue according to everything I’ve seen

The light could be burned out, anything is possible. I'll look at some wiring diagrams to get ideas.

 

[Mr Mumbles]

With two pumps and both developing low pressure to the rails, I'd suspect the fuel pressure regulator first. It's vacuum operated and one symptom of a bad regulator is low fuel pressure to the injectors which can cause a no start, rough idling, stalling etc. If the diaphragm in it is ruptured, fuel can get into the vacuum line to. It can be tested for a leaky diaphragm with a vacuum pump.

 

[KONxKOE]

With two pumps and both developing low pressure to the rails, I'd suspect the fuel pressure regulator first. It's vacuum operated and one symptom of a bad regulator is low fuel pressure to the injectors which can cause a no start, rough idling, stalling etc. If the diaphragm in it is ruptured, fuel can get into the vacuum line to. It can be tested for a leaky diaphragm with a vacuum pump.

Replaced the crankshaft sensor and it immediately started up.. never had a code for crank but hey it worked! Thanks all.

 

[wollimann]

How did you get on the CPS?
So a bad CPS interrupts the injection, mabe fuel pump but not the ignition and starter?

 

[KONxKOE]

How did you get on the CPS?
So a bad CPS interrupts the injection, mabe fuel pump but not the ignition and starter?

I saw a couple things saying something about injectors getting killed by the crank sensor.. fuel pump cut on like normal, truck turned over like normal all good just no start.. I had already changed all those other pars so I said screw out what’s 30 bucks and it worked

 

[Josh P]

Good to know.