I have an electrical (I believe) issue I need help with. I had a major coolant leak on my truck Friday so yesterday my nephew and I pulled the intake manifold and replaced the donut o-ring that sits under the front of the manifold. Problem solved!

We drove the truck for quite some time last night and this morning, runs perfect. So today I decided to wash my motor to get all of the dried coolant off my motor. I regularly wash my motor with no issues whatsoever. When I finished washing, my truck started fine and ran great, went about 30 or so feet and began to run real rough with no power. It wasn't smoking, just no power. Went about a half a block and parked. Still running rough with some occasional smoke. I let it idle for about 15 minutes, still running rough and when I would try to rev up my rpms, it wouldn't. It finally started to smooth out and idle up. I then let my foot off the accelerator and my truck died and will not start.

I just checked my FICM and I'm getting 48.2 volts while cranking. Any help and suggestions is greatly appreciated.

 

Just pulled the plug on my ICP and tried to start. No luck.

 

Any Gauges???????????


This is why I dont wash my moter I used to but killed a alternator in another car I had and since then no more high pressure car wash in the engine bay

 

I have a basic code reader. I'm going to go out after dinner and see if I have any codes. There were no indicator lights coming on before it died.

 

My code reader shows no codes. However I do have a question... when I crank my motor after 3 or seconds my oil gauge is showing pressure, yet my tachometer is not registering any rpms while cranking. Shouldn't my tach be registering during that time? If not, it seems as though my problem could be either a crankshaft or cam sensor (credit that thought to inverted99, not me). Thoughts?

Another note, my code reader does display live data and it registers about 160 rpms while cranking even though my tach does not register any rpms at all.

 

The Crank Sensor drives the tach. If the tach isn't moving, the crank sensor (or wiring) is likely to have died.

 

Bismic you are the man! Thank you so much for the reply. So do I understand correctly that my tach should be registering something during a crank with no start? And if so, could this cause a no start?

 

That is what I was thinking until I saw your other post. I don't know why the computer would see a reading but the Tach wouldn't show it - maybe a default reading??

btw - if there IS an issue with it, it is usually a wiring or connector issue rather than a sensor issue.

 

If it is your issue, here is some info on it:

The sensor is located about 4 inches behind the a/c comprssor. First - disconnect the batteries! A bracket will then need to be removed: The two lines to the tranny filter go under the bracket (wiring bundle bracket that also secures the ground wires to the block above the oil pan and above the steering stabilizer) that needs to be unbolted to gain access. It is held in with an 8mm bolt - a long (16 inch) extension with a pivoting adapter is what is needed. Long needle nose pliers with a 45 degree bend would have helped also. Like stated before, unplug sensor before removing and plug it in after installing. (The wire is not long enough to make it easier after removing sensor.) Long skinny arms and a lift will help a lot.

http://www.powerstrokehub.com/servic...troke-ckp.html

 

I don't know what else to do so I guess I will try this tomorrow. Unfortunately I don't have long, skinny arms... or a lift, I do have a floor jack.

Well, considering I had to pull my intake manifold yesterday to fix my coolant leak hopefully this will seem easy by comparison.

Thank you again for your help.

 

Its the Camshaft sensor that gives the Tach readout


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So the camshaft sensor could be the issue then? From what I gather reading the info you posted (thank you VERY much) it would seem if this sensor is out or possibly I got water down in the connection so it doesn't work properly.. it would cause my problem. Maybe "could" would be a better word to use.

 

Benny - from the PC/ED manual -

Engine speed is determined by counting the 15 windows in the crankshaft gear each crankshaft revolution ........................

Specifically: Engine speed (N) and crankshaft position are determined by the crankshaft position sensor (CKP) which reacts to
a 60 (minus 2) tooth target wheel.

That being said, the PC/ED manual (like your 6.0L bible link) states that the PCM is also looking for a CMP signal to report the engine speed, even though the calculation is based off of the CKP. I would like to hear a Tech jump in on the description of how that actually works in the PCM.

Either a bad CKP or CMP can cause a no-start.
Neither sensor is all that expensive to buy and drop in ($30 each at TousleyFordParts), but the wiring is typically more of an issue than the sensors. Even so, these sensors do occaasionally fail.

No SYNC and NO RPM signal, typically is a faulty CKP sensor/circuit problem.

No SYNC WITH an RPM signal typically is a faulty CMP sensor/circuit problem.

Check out pages 46 of the document below (labeled page 44)

http://www.forddoctorsdts.com/articl...eTableBook.pdf

Also -
https://www.ford-trucks.com/forums/8...os-sensor.html
See post #3 from Tim and post #7 (from a Tech)

Javo - What Benny may be on to is that you are telling us that the PCM actually sees an rpm signal - just not registering on the tach. Maybe this is what the PC/ED manual and the 6.0L bible meant about requiring both signals .......... who knows (love to find out for sure). If this is the case, Benny could be correct in that a failed CMP is preventing the Tach from displaying the rpms even though an rpm IS being calculated by the CKP and seen by the PCM.

What would help tremendously is if you have a scan tool and can look for CMP/CKP sync (SYNC) and FICM sync (FICMSYNC).

 

I will try both today, starting with the CMP. I will post back and let you know the results. Thanks again.

 

Well Mark with all that info from your Links Now Im confussedLOL

Iv just always assumed Tach came from CMP and thats just cause the way I read it in My post of the Bible page