Ford Repair Questions? Ask a Mechanic for Answers ASAP
Hello Bill and thank you for your question,If you connect your fuel pressure gauge to the service port , what is the pressure readings while the problem is occurring from your new pump?
So its also holding when its hard to start?Are there any fault codes setting?
In most cases if the theft system was at fault the theft light would be flashing and it would normally not start at all. If the fuel pressure is holding steady then the pump is running and that would rule out the inertia switch. Give me a moment and let me look in to the P0118 code for you. It almost sounds like it loading up .
The common cause for the code P0118 to set is in most cases caused by a failing CHT (Cylinder Head Temperature Sensor) and if in fact its bad it could very likely affect the engine starting causing the computer to over load the system with fuel. I would consider replacing the CHT .
The CHT sensor is located at the back of the right side cylinder head. See the replacement steps in the link below. Copy and paste the link to your browser to open and view them.https://dl.dropboxusercontent.com/u/104923897/CHT%20JUN%2028.pdf
That would be normal , if it flashes fast with the key on then it active but this dose not sound like a theft issue to me and beside there are no fault codes for the theft system which in most cases if it was a problem there would be.I know if the computer can not read engine temp is will cause the system to be rich. I would sure address the P0118 first.
If you would like to run the pinpoint to verify, I can send you the steps.
See the pinpoint test steps in the link below for the CHT.https://dl.dropboxusercontent.com/u/104923897/P0118%20Pinpont%20Jun%2028.pdf
The IAC is an actuator which only controls idle speed and allows air to by-pass the throttle plate on start up. If you crack the throttle while the problem is occurring dose it start any easier?
Then I think you can safely rule it out. If I was there working on this, I would start first with the one known issue and that is the code P0118. I would run the pinpoint test to verify the CHT has failed and replace it so the code clears and see if the problem clears. The computer has to know engine temp or its going to cause the system to be in open loop all the time which causes a rich condition. I would not jumper it. I would check the signal out of it.
Your very welcome, Im here if you need me.
The instruction call for removing the converter Y pipe and the air conditioner deflector shield.
Are you sure this is a 2000 year model?
That the only place it should be on the from 1999 and up. on the 1998 engine its located under the intake on the cylinder head. See it in the link below. If you find it there then the engine has been changed.https://dl.dropboxusercontent.com/u/104923897/CHT%201998%20Jun%2028.pdf
Your 5.4 uses a CHT which takes the place of the ECT.
That would make me think the engine has been changed.
Well have a look and see if in fact it under the intake. It sure sound like that is the case.
Okay. Im here if you need me.
Thats the right location and the part you holding looks to be the right part. Once you have the intake off, make sure you take a good look at the wiring to it for any signs of damage due to it location.
Well then replace the sensor and see if you can get the P0118 to clear. I suspect if you can you will solve your starting concern.
Okay. Good luck.
Sorry I was off for the evening. I start work at 3 eastern time.In order for the engine to start and run you need good spark to the spark plug, injector pulse at the injector and proper fuel pressure , now that it will not start can you check each one of these and tell me which one you are lacking?
The IAC being bad would explain the Idle hanging, that being said, if the fuel pump is coming and going and you loosing injector pulse I would suspect the PCM and or the connection to it. Both are controlled by the PCM.
Well if you sure its not defective then I would go back and recheck powers and grounds to it.
In most cases if the regulator is leaking you will get fuel leaking out of the nipple, are you?
Not to mention, a bad regulator would not cause you to loose injector pulse.
In most cases if its not leaking and your pressure is holding like you said then you do not have a bad regulator.
Are you getting any anti theft fault codes?
Well in most cases if the theft system has issues it will set a code
When it dose not want to start what are you loosing, spark or injector pulse?
Unfortunately the PATS can not be by-passed.
Yes , let me know which circuits your needing and I can send the diagrams.
The PATS actually connects to the instrument cluster See the diagrams in the link below.https://dl.dropboxusercontent.com/u/104923897/PATS%20Jun%2030.pdfhttps://dl.dropboxusercontent.com/u/104923897/PATS%202%20Jun%2030.pdf
It communicates with the instrument cluster which in turns communicates with the PCM.