CRD not starting after flexplate replacement

[JoergM]

Originally Posted by Straubz

Only code it has is p0460? Any ideas, seems to be getting to the injectors fine

If you check on the website https://jeepswj.com/tips/

you will find this info
P0460 FUEL LEVEL SENSOR CIRCUIT SIGNAL VOLTAGE TOO LOW

Did you get the WJDiag software with the appropriate OBDII Adaptor? This makes a huge difference on this particular model. All in all maybe 50 Dollar (Software ca 20 as far as I remember) and the OBDII adaptor ca. 30 Dollar, just make sure to get the right one.

[JoergM]

Originally Posted by Straubz

Only code it has is p0460? Any ideas, seems to be getting to the injectors fine

Not sure if this is related to your starting issue though. Does this sensor has any impact on the fuel delivery system?

[5oclock]

The fuel pressure needs to be above certain level during cranking for it to inject. Air in the system or a bad injector with high leakage can stop this happening. A small squirt of aerostart or similar might make it fire up for a moment and get the pressure up so it will run and maybe get the air out of the fuel system.
Hope its a simple fix.
PS, what JoergM said about the OBD readers is spot on, some of the cheap ones work ok but mostly they are not much good on the WG.

[layback40]

Have you tried to start it with starter fluid?
Just a light spray in the airbox.

[Straubz]

got a reader coming sometime next week, so far we have got it to start but stalls out fairly quickly and runs poorly, brother recons the cam and crack sensor needs to be reprogrammed/resynced, not sure if thats something you can do on these.

[5oclock]

OK, on the reader, at least then you will be able to check for codes, which it should throw a code if there is a problem between cam and crank sensor.
So it will now start and run,,it does sound like air in the fuel system,,,the rubber hoses from the metal supply pipe on the firewall can be cracked or have a pin hole that doesnt leak fuel but will let air in and lose prime overnight etc. There is no pump in the tank the low pressure lift pump is on the front of the motor,this is why any dodgy connection or O ring on the suck side of the fuel system can cause so much trouble.
I am pretty sure its not possible to put the flex plate on 1 bolt hole out, not with out grinding out holes etc.

[Wantsawillys]

I know you want to get this thing running but honestly you're better off waiting for that code reader rather than faffing about. Trust me, you'll just end up getting frustrated with the jeep and start resenting it.
I have 2 in my yard right now that I can't get back to until I resolve some issues with my KJ which is my current daily driver.

That code reader and the wjdiag app are going to be your new best friend.
First thing to do when you get the reader is to read any codes and take a screenshot for later.
Then clear them so you start fresh (a lot of codes can be bogus and are set because of poor battery voltage, crank sync errors get set a lot because of this, and also from a poor starting event)
If you can start it with starting fluid (don't keep doing this) and it runs like crap, but you can't start it normally, i suspect you've got one (or more) of the following happening;
1. air in fuel. caused by bad o rings in the plastic fuel line connectors at the pumps and filter. Cheap fix, parts from mercedes dealer
2. low fuel pressure. caused by leaking high pressure pump, or faulty injectors with high leak off. Can also be caused by a faulty pressure regulator. The pump can be rebuilt with a seal kit for about $50, so can the pressure regulator. Leaking injectors means you need to replace them with new ones. Don't do refurbs, just not worth it. This is the most expensive thing to fix, and usually why crds are sold.

One of my WGs needs new injectors, because it is behaving the same as yours.
The other one has a fried (maybe) pcm because there is a fault in the wiring harness.

When you get the app, you'll want to go to the engine section, and pull up the real time data, and select the fuel pump pressure set point, fuel pump pressure actual, fuel rail pressure, fuel rail regulator sensor voltage / duty cycle pids and display them.
Crank the engine (not for long though) and see what pressure the pump gets up to. From memory it wants 250psi before it will turn on the injectors to start.

If you're not getting the pressure needed, then we can do other diagnostics.
The 'everything 2.7 crd' thread has a lot of this info in there, but i'm doing what you are so i can help