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Update— P2294-FUEL PRESSURE SOLENOID
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=89419
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Author:  flash7210 [ Thu Nov 08, 2018 10:21 am ]
Post subject:  Update— P2294-FUEL PRESSURE SOLENOID

I guess it was bound to happen eventually.
Started up fine this morning. Drove over to the gas station to get some coffee. Started up again and drove about 500 feet when the engine quit suddenly and wouldn't restart.
Scanned and got a P2294 code.
Pulled and checked the connector to the fuel rail pressure solenoid. Seemed fine so I firmly reconnected it. Also checked the connections to the fuel quantity solenoid and the fuel rail pressure sensor. Everything looked ok but still wouldn't start up again.
I was only a couple of blocks from home so I called my wife and had her tow me home.
So I finally got to use my recovery strap and tow hooks and D rings. Woohoo, :oops:

Still got some more diagnosis to do but I'm fairly certain that I'll be needing a new fuel rail pressure solenoid. :banghead:

Author:  vwroad87 [ Thu Nov 08, 2018 3:19 pm ]
Post subject:  Re: P2294-FUEL PRESSURE SOLENOID

flash7210 wrote:
I guess it was bound to happen eventually.
Started up fine this morning. Drove over to the gas station to get some coffee. Started up again and drove about 500 feet when the engine quit suddenly and wouldn't restart.
Scanned and got a P2294 code.
Pulled and checked the connector to the fuel rail pressure solenoid. Seemed fine so I firmly reconnected it. Also checked the connections to the fuel quantity solenoid and the fuel rail pressure sensor. Everything looked ok but still wouldn't start up again.
I was only a couple of blocks from home so I called my wife and had her tow me home.
So I finally got to use my recovery strap and tow hooks and D rings. Woohoo, :oops:

Still got some more diagnosis to do but I'm fairly certain that I'll be needing a new fuel rail pressure solenoid. :banghead:


I got a friend with the same symptoms. Driving fine, lost power, then died. Same code. Changed fuel filter, started and ran great. Then took it to work the next day and wouldn't start after work. Installed intank lift pump, no joy. Got a crank sensor on order. Snap-on scanner did show good pressures... Following your thread closely now.

Author:  flash7210 [ Sun Nov 11, 2018 2:04 pm ]
Post subject:  Re: P2294-FUEL PRESSURE SOLENOID

Got it running this morning.
Not sure what I did though.

I removed the fuel line from the filter outlet and attached a longer hose to run it into the catch can. Turned key on, lift pump started pumping, and got good flow and clean fuel out of the filter.
So the low pressure side was good.

Checked all the connections to sensors and solenoids
Then cleared all the codes.
And then the engine started right up.
Took it for a short drive, smooth running without the slightest hint of a problem.

The only thing I can think of that fixed it was removing the orange seal from inside the connector to the fuel rail solenoid. I did that on Thursday while I was stuck on the side of the road. But it didn’t seem to help with anything.
But I also didn’t clear the codes.
So I guess with a problem such as this you must clear the codes to get things working again.

Those orange seals inside the connectors have been a reoccurring problem for me.
I guess what happenes is the seals swell up enough to pull the pins off the connections.
When this happens the connector is very hard to remove

Author:  DarbyWalters [ Sun Nov 11, 2018 2:42 pm ]
Post subject:  Re: P2294-FUEL PRESSURE SOLENOID

Crank Sensors are known to cause shut downs and no starts...

Author:  flash7210 [ Sun Nov 11, 2018 4:25 pm ]
Post subject:  Re: P2294-FUEL PRESSURE SOLENOID

DarbyWalters wrote:
Crank Sensors are known to cause shut downs and no starts...

Been there, done that, about 4 months ago.

Author:  vwroad87 [ Sun Nov 11, 2018 6:01 pm ]
Post subject:  Re: P2294-FUEL PRESSURE SOLENOID

flash7210 wrote:
Got it running this morning.
Not sure what I did though.

I removed the fuel line from the filter outlet and attached a longer hose to run it into the catch can. Turned key on, lift pump started pumping, and got good flow and clean fuel out of the filter.
So the low pressure side was good.

Checked all the connections to sensors and solenoids
Then cleared all the codes.
And then the engine started right up.
Took it for a short drive, smooth running without the slightest hint of a problem.

The only thing I can think of that fixed it was removing the orange seal from inside the connector to the fuel rail solenoid. I did that on Thursday while I was stuck on the side of the road. But it didn’t seem to help with anything.
But I also didn’t clear the codes.
So I guess with a problem such as this you must clear the codes to get things working again.

Those orange seals inside the connectors have been a reoccurring problem for me.
I guess what happenes is the seals swell up enough to pull the pins off the connections.
When this happens the connector is very hard to remove


ARG :banghead: I hate these non-fix fixes. A rubber grommet in the connector? Okay so I will check the connectors I guess, again. Will advise.

Author:  flash7210 [ Mon Nov 12, 2018 6:20 pm ]
Post subject:  Re: P2294-FUEL PRESSURE SOLENOID

It happened again today.
This time it also had a p0087 code.
Didn’t need a tow this time however.
After someone helped me push it safely out of traffic, l cleared the codes and it started right up.

Must be a intermittent loose connection somewhere.
Or it’s a intermittent open circuit inside the solenoid itself.

Author:  vwroad87 [ Mon Nov 12, 2018 8:53 pm ]
Post subject:  Re: P2294-FUEL PRESSURE SOLENOID

flash7210 wrote:
It happened again today.
This time it also had a p0087 code.
Didn’t need a tow this time however.
After someone helped me push it safely out of traffic, l cleared the codes and it started right up.

Must be a intermittent loose connection somewhere.
Or it’s a intermittent open circuit inside the solenoid itself.


Now I'm thinking you have a wiring or connection harness fault. Many have seen this picture but at one point this caused the main PCM fuse to blow.

This was passenger side firewall around the A/C accumulator.

Image

Author:  thermorex [ Tue Nov 13, 2018 12:46 am ]
Post subject:  Re: P2294-FUEL PRESSURE SOLENOID

I had a similar issue (not identical) couple years ago, with one injector. The wires to the injector plug were messed up, causing a code (really don't remember it) which caused a limp mode. This happened from every 4-5 months to every couple months till it just limped me while on the highway. I tried to wiggle the wires till I found the injector with the issue. I remember it was a generic code and not an injector specific. I had a spare wire harness and I replaced the plug and no issues from that time.

I'm not sure if wiggling the wires would help you with anything, but I'd think it's worth a try.

Author:  Mountainman [ Wed Nov 14, 2018 1:25 am ]
Post subject:  Re: P2294-FUEL PRESSURE SOLENOID

Check if one of the pins are lightly burnt on the ECM. Seen this twice now, a scrape, slight bend and some dielectric to quench any future micro-arcs or corrosion solved both

Author:  GordnadoCRD [ Wed Nov 14, 2018 10:23 pm ]
Post subject:  Re: P2294-FUEL PRESSURE SOLENOID

Hey Flash,

Something to be aware of on that particular part... In the course of digging through mine, I exchanged communication with Keith from GDE, who, as you know, has spent extensive testing hours, both in and out of vehicles. One of the things he mentioned is, the Fuel Pressure Solenoid, when it fails, often does not fail with a hard fault, but with a pintle that sticks or leaks, or both, which can also cause these symptoms. I'm not certain how to test this, except for similar to the way one tests an old starter motor that might be going out. Might keep that in mind if you don't find any issues with the wiring.

Author:  flash7210 [ Thu Nov 22, 2018 1:36 pm ]
Post subject:  Re: P2294-FUEL PRESSURE SOLENOID

Had some time yesterday and this morning to tinker with it.
The fuel rail solenoid is getting a full 12v with the key on engine off.
It’s also getting a good ground through the ECM.
When cold, it will start up and run without hesitation.
Wiggling connectors and wires does not cause any sputtering or stall.
I can even drive it a short distance but will stall out and set the code after 10-15 minutes of run time. If I’m lucky I can clear the code and restart.

Next step is to pull the rail and ohm the solenoid.
And order a new solenoid.

Here’s what I think is happening:
When cold, the internal wiring/contacts have good continuity. After running and duty cycling for a period of time, resistance increases and/or continuity is lost.

Author:  Sir Sam [ Tue Nov 27, 2018 12:15 am ]
Post subject:  Re: P2294-FUEL PRESSURE SOLENOID

flash7210 wrote:
Had some time yesterday and this morning to tinker with it.
The fuel rail solenoid is getting a full 12v with the key on engine off.
It’s also getting a good ground through the ECM.
When cold, it will start up and run without hesitation.
Wiggling connectors and wires does not cause any sputtering or stall.
I can even drive it a short distance but will stall out and set the code after 10-15 minutes of run time. If I’m lucky I can clear the code and restart.

Next step is to pull the rail and ohm the solenoid.
And order a new solenoid.

Here’s what I think is happening:
When cold, the internal wiring/contacts have good continuity. After running and duty cycling for a period of time, resistance increases and/or continuity is lost.


Heat it up with a heat gun and see?

Author:  GordnadoCRD [ Tue Dec 04, 2018 1:30 am ]
Post subject:  Re: P2294-FUEL PRESSURE SOLENOID

It's definitely possible.

There are two other modes of failure I know of.
The one I found by taking it apart, was the needle tip erosion resulting in a very small leak. Even a microscopic bit of crap getting caught there between needle and seat can do the same thing.

Keith at GDE has come across a couple where the valve needle going through the solenoid was sticking or the spring was broken and it wasn't properly seating the needle to the seat.

At any rate, with the price of a new LML unit, it's probably not worth messing with unless you're intolerably curious like I am.

The main thing is the special tool for torquing the threaded pressure sleeve. There are 2 options besides the actual VM tool available. I can't remember the contact information, but i'm relatively certain either WWDiesel or Mountainman would know.
EDIT: I guess there is a 4th option. I actually made the special tool that I used from a 30mm combination wrench, and a broken 3/8 to 1/4 drive adapter. About a year later, the 30mm crowfoot that I ordered finally arrived. :banghead:

Author:  Mountainman [ Tue Dec 04, 2018 1:04 pm ]
Post subject:  Re: P2294-FUEL PRESSURE SOLENOID

You can borrow my VM tool if you want. It's small enough to ship in a priority envelope I think, so it would make it fast.

Author:  flash7210 [ Mon Feb 11, 2019 3:39 pm ]
Post subject:  Re: P2294-FUEL PRESSURE SOLENOID

Update:

Finally got a new solenoid, 30mm crows foot, reinstalled fuel rail...
...blah blah blah...
Still the same problem!
Cranks, no start, P2294 code. :banghead:

I have verified that fuel is getting to the rail.
Tested the circuit to the fuel rail solenoid.
With key on, engine off, I get 12v to one of the wires to the solenoid. The other wire goes to ground.
Removed and checked pins 4 and 52 on the ECU. All good.
Verified continuity from the ECU harness to the solenoid. All good.
Checked resistance through the circuit with the solenoid plugged in. I get 5 ohms.
Checked resistance through the old solenoid. I get 5 ohms.

Can’t find any reference in the manual as to what the resistance of the solenoid should be.

Everything in the circuit seems to test good but the ECU still sees it as a open circuit.

Is my new solenoid bad?
What else could it be?

Author:  Mountainman [ Mon Feb 11, 2019 4:09 pm ]
Post subject:  Re: Update— P2294-FUEL PRESSURE SOLENOID

Maybe you and a couple other Lost members with similar problems should pass an ECU around. Of course, it would have to go to GDE inbetween for VIN change.

Author:  GordnadoCRD [ Mon Feb 11, 2019 5:40 pm ]
Post subject:  Re: Update— P2294-FUEL PRESSURE SOLENOID

I know you already know this stuff, but this is the order I would look.

Do the cranking leak test (plug the line you disconnect, leave the nipple clear.) You already checked your in-line pump and filter. You know your CP3 is delivering fuel (I have verified that fuel is getting to the rail.)
If ANY leaks out the nipple when cranking, you have a problem there or in the control circuit that needs fixing.
If NONE leaks out when cranking, both the solenoid valve and the control circuit should allow sufficient starting fuel pressure.
- If you've gotten to this point, and have sufficient fuel pressure but no start, your problem will likely be electrical.
Probably a wiring circuit/connector issue, (increasing likelihood as these rigs age.) emphasis on solid, clean grounds.
Possibly cam or crank sensors.
Rarely fuel pressure sensor or ASD circuit.
Seriously doubtfully CP3, or ECM (extraordinarily rare).

Author:  flash7210 [ Mon Feb 11, 2019 5:45 pm ]
Post subject:  Re: Update— P2294-FUEL PRESSURE SOLENOID

Dare I say, this will be my final update...

I got it running :BANANA:

But I had to pull some trickery.

Along with bleeding the fuel rail, I had to convince the ECU to stop setting the p2294 code. I’m not sure how but I somehow stumbled across the right sequence of clearing the code and key off/on and finally it stopped setting the code.
But still wouldn’t start.
Then I had to unplug the fuel quantity solenoid and the fuel rail pressure sensor and finally it started.
I plugged everything back in and took it for a test drive.
It ran great.

Suddenly all was right with the world.
Or, at least within my driveway

Author:  Mountainman [ Mon Feb 11, 2019 9:12 pm ]
Post subject:  Re: Update— P2294-FUEL PRESSURE SOLENOID

Congrats, but what a PITA intermittent faults are. Has it ever died while running?

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