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Got in the truck this morning with my family to head to church and the truck would crank but not start. I finally put the charger on it and left it till after church. Here is what I have found so far...
While cranking I have no Ficm Sync and no Cam/Crank sync on my scanguage. Also my RPM is showing 75rpm while cranking. The truck is turning over much faster than that and the batteries and starter are new. Should I have sync while cranking?
IPR, ICV are good low oil pressure was good. FICM power is good. STC, Dummy plugs etc have all been done.
i may be on the right track now... I finally got it pushed into my shop so I could get to work on it. I put a 200 amp charger on and started to crank. As soon as the RPM registered over 150rpms it started. Before it was only showing 30-70rpms and would fluctuate. It has started beautifully 10 times in a row.
What sensor displays rpm at startup? Is it the crank or cam sensor? Is there a good picture of where those are located? I looked with a flashlight and didnt see them.
Check the wiring going to the cam and crank sensors.
DING DING DING!!! You are correct. The bottom 2" of the Crank sensor harness is bare! Its in bad shape. I am sure this is the problem... But how the heck do you change it? I would like to solder a new harness on it but there is NO room to work. Any suggestions?
DING DING DING!!! You are correct. The bottom 2" of the Crank sensor harness is bare! Its in bad shape. I am sure this is the problem... But how the heck do you change it? I would like to solder a new harness on it but there is NO room to work. Any suggestions?
Back in the day, when these trucks were under warranty we were told NOT to attempt to repair or overlay the CKP or CMP circuits due to the fact that they are ground shielded. This of course is to prevent any RFI that can, and will cause the exact issue you described that happened to you, causing your no-start/incorrect engine RPM input concern. Since you mention 2006 as the model year, the part number from Ford for the entire engine harness for late '05 up to and including '07 model years is 5C3Z-12B637-BA. I realize that pricing out this harness may be astronomical, but there is also no wiring pigtail (at least none that I'm aware of) available from Ford for the CKP. To access that wire, removing the air deflector on top of the fan stator as well as removing the belt tensioner (one long and one short 10mm bolts) will give you plenty more room. Removing the main ground cable from the engine front cover on the lower right side and loosening all three A/C compressor bolts will also aid tremendously. Good luck.
When you splice it you want to use a grounded shield splice kit.
I have a few in my tool box for aircraft work. It's done there a lot.
It's a crimp joint not solder.
Sheld wire splice kit
The outer cover is a heat shrink tube to keep it nice and clean and to
tighten up the shield braid.
