351W no start
Lead Driver
Joined: Jan 2019
Posts: 5,070
Likes: 863
From: N.W. Alabama
you can test your injectors, if you have fuel pressure and firing(starts on carb cleaner) see if they are opening
Part 3 -Ford 4.9L, 5.0L, 5.8L Index of Articles
Part 3 -Ford 4.9L, 5.0L, 5.8L Index of Articles
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Mountain Pass
Joined: May 2011
Posts: 183
Likes: 0
So I checked all of cylinders but #3 and #4 (the back two on the passenger side under the manifold). I got some noid lights and they all worked and I checked all of the ohms on the injectors and they are around 14.5. I had some that I did not clean prior to putting back in and they are around the same 14.5 ohms. I rechecked the timing and put it back into the factory spot, checked all the wires and still nothing. Like I said, don't know about the back two cylinders with the injector ohms or if they are getting signal, but I thought with the front two getting signal that the back two should be fine. I checked spark on the front two cylinders on each side and they have spark. Still haven't done a smoke test but at this point it seems that fuel, spark and air is present and I'm at a loss. I really figured it would be signals to the injectors, or the injectors themselves since it doesn't make an attempt to fire but as soon as you open the throttle body, spray something in, it hits immediately and burns that and dies, or keeps running if you keep spraying.
Lead Driver
Joined: Jan 2019
Posts: 5,070
Likes: 863
From: N.W. Alabama
with the gauge hooked up and you turn the key to on, watch where pressure goes to, then turn key off and watch gauge and see if the pressure stays high or drops slowly or quickly(should drop slowly) or could have leak in injector/s, then with gauge hooked up and truck running what is gauge reading(should be 31-36 psi) while running, may have already been asked, but have you changed fuel filter on frame rail lately
Lead Driver
Joined: Jan 2019
Posts: 5,070
Likes: 863
From: N.W. Alabama
that dont tell you if the pump is maintaining the needed fuel pressure to keep truck running, and I wouldnt use 90psi of air pressure to check 30-40psi fuel pressure, not sure what harm could be done, to injectors, fuel pressure regulator diaphragm ruptured, fuel filter blowing out insides, now even bigger trash could get by and clog injectors
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Mountain Pass
Joined: May 2011
Posts: 183
Likes: 0
I didnt check fuel pressure last night, only checked to see how much fuel was coming out, but I did check it before hand and it went to mid 40s and then slowly went down after a bit. I cant really check it when running unless I spray carb cleaner in there to make it run and check it that way.
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Mountain Pass
Joined: May 2011
Posts: 183
Likes: 0
I went to the junkyard today and pulled some injectors and replaced them. Even though the circuit tested good, once I pulled the rail and left the injectors on they weren't spraying. I replaced them all and its up and running. Not sure what truly happened with them, but oh well
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