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Comments
I don't want to sound silly or stupid or make you feel like that but is there fuel in the tank? Strange things can happen, like someone steeling the gas...
I am not certain but I think the fuel pump wire (s) are green with a pink tracer, but it is best to check the book to be sure of this.
The only time the pump should run continuisly is when the engine is "running". But even if the pump is running continuisly the engine should start. Makes me think of the relay may be at fault.
My question is, could the PCM cause this? If it's unlikely, then where do I need to be looking? I know there was talk of a ground jumper, someone even mentioned it might be some kind of ignition control module or such. I don't know where any of these are located in the truck, and I'm running out of time before I'm out of the Army, and technically out of a job and home. I HAVE to get this truck running again, please help.
Mike
Mike
I went out and got an analyzer. The problem just gets stranger. I did the key on engine off test and it made my engine light turn off it tested okay. The only stored code was a engine control assembly problem (thats what the book from the analyzer called it) when I looked it up on the internet it said a power interrupt. Code 512. If I run it without the analyzer the light comes back on and it run horrible. I did the engine running test and got a all okay code 111 once and 225 (knock sensor signal not detected. Even before the cel come on it runs rough without the analyzer. With it it runs great. I'm at my wits end. any help would be greatly appreciated.
Mike
Mike
When ever you replace a part or make a repair, you are supposed to disconnect the battery. Removing the negative battery post makes it safer to work on the engine AND tells the computer it needs to look for new parts or corrections to the control system etc.
Disconnect the battery, leave it disconnected for at least 10 minutes. Then replace the battery lead. Start the engine and take it for a drive. It WILL RUN ROUGH for a bit. You need to run it continually at a constant speed of 55 MPH for around 10 miles so a highway is always best. Keep the speed as constant as possible while the computer checks the engine and controls positions and situation. Hopefully this will create a keep alive memory for your computer. Code 512 is the knock sensor which I believe is located on the passengers side of the vehicle block. Check the connector and wire from it into the harness.
code 111 is the ok code for the system. The analyzer is probably replacing the vehicle computer while getting this code and after disconnecting the analyzer it tries to go back to Keep Alive Memory because the problem hasn't been corrected but can't because it hasn't got a memory. Maybe a new computer is in order. Please let me know what you find.
Mike
I appreciate your time and help. The analyzer I bought is an Actron code scanner.
I took out the computer and see no signs of heat or burning which I have seen on other forums being the common problem. Do you know of anyone that can test the computer so I am not spending the $ on something I don't need.
Mike
My fuel rail has no pressure at all. I can't hear either of the fuel pumps kick on, no matter which tank I select.
I checked the selector switch, it is working. I triple checked to make sure I have gas in both tanks.
I checked the inertia switch, it wasn't tripped. But I tripped it and reset it anyway.
I replaced the fuel pump relay in the distribution box under the hood.
I checked all fuses in the distribution box, and in the cabin under the dash. None were blown.
I tried unplugging the Map sensor.
I tried disconnecting the battery for 3 hours straight.
I checked for broken wires, but I can't find any, unless they are hidden else where...
One other bit of information that may or may not help. I live a block from the ocean which can be a very corrosive environment.
I am stumped. Does anyone have any suggestions that I haven't tried? Similar experiences? Any advice would be GREATLY appreciated. Thanks for your time.
Mike
I did every test at home that I could do and still couldn't prove it was the PCM. I finally took it to a Ford dealership and for a $200 fee found out the PCM had a short in it. So now on the hunt for a new computer. Autozone has one for $297 but I will look around for a deal. I'll let you know what I find.
Thank you and keep me informed as to the new computer and how it runs after installation.
Mike
I have had the code checked and always says "number 6 cylinder missfire" I have replaced the plug, replaced the coil twice as I evidently broke the first one, replaced the fuel pump, replaced the fuel filter and replaced the fuel rail pressure/temperature regulator. STILL no solution. I am going broke here.
I have seen where others have had the same problems but I can never seem to see their solutions if any.
Could someone help me PLEASE?
Good Luck...
The selector valve is supposed to prevent that siphoning action from occurring.
just sayin', IMO
the problem is in the valve that switches the fuel RETURNING from the injectors.
fuel pumps constantly from the tank to the injectors. the injectors use only what the injector pulse control computer tells it and the rest goes back to the tank. If the valve fails to switch like mine,running on the back tank will cause the returned unused fuel to returning to the FRONT tank. eventually the front tank will over fill. a new switching valve cured it