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Hello, my name is ***** ***** I am a professional here at Justanswer. Thank you for your question and I will assist you with your concern.Dose the fuel pressure hold steady when it will not start?Have you scanned the computer to see if there are any fault codes setting?
When it will not start if you pull the spark plugs are they gas soaked?
If you are sure you have good spark at the spark plugs when it will not start and proper fuel pressure then I would start with checking a couple of the spark plugs for any signs of fuel fouling and if they check okay then check to see if you have injector pulse at the injectors when it will not start. You can do this with a standard 12 volt test light by placing the test end of the light in the power side of the connector at any one of the injector s and the ground in on the other side and then crank the engine over. If you have pulse, the light will flash.
Yes you have a throttle body for sure you also have 6 injector , one for each cylinder. You will see them if you look at both sides of the intake where the are mounted.
Yes, post back when you ready, the service port where your connecting your fuel pressure gauge is on one side of the injector at the rail.See there location in the link below.https://dl.dropboxusercontent.com/u/104923897/Injector%20Aug%2022.pdf
Heavy black stuff as you call it is usually fuel and or oil. Are you sure your compression is okay?
Well if you sure you have good spark at the spark plugs and injector pulse at the injector and proper fuel pressure the engine should start. If it fouling the spark plug and you suspect it fuel it could be a excessive fuel pressure issue. One thing that might be an issue is a leaking fuel pressure regulator, have you pulled the vacuum line off the regulator to see if there are any signs of fuel ?
The code P1401 set due to a failing DPFE (Delta Pressure Feedback EGR (DPFE) Sensor) and if its shorting out internally it could cause a no start. Try disconnecting it when the no start problem is present. If it start with it unplugged then its shorted and needs to be replaced. See its location in the link below.https://dl.dropboxusercontent.com/u/104923897/DPFE%20Aug%2025.pdf
Okay then you back to either a lack of spark or injector pulse or a fuel pressure concern or the spark plugs are fouling out. If you have everything like your saying the engine should start and run. Something is being overlooked here.
Its not likely if you have injector pulse and no TP fault codes setting.
Yea that what I would do, go back and recheck everything . Im here if need be tomorrow as well.
Well at this point Im out of ideas. As you know, you need good spark at the spark plugs, injector pulse at the injectors,proper fuel pressure and good compression and if you are sure you have all of these the engine should start and run. I can open the post back up for you if you would like, perhaps someone else may have something different to offer.