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I have a 2007 F150 with a 5.4L. It's having a crank no start…

I have a 2007 F150...
I have a 2007 F150 with a 5.4L. It's having a crank no start issue now. It's frustrating because I've gone through all these forums looking for answers but nothing has helped. I have spark air and fuel. I've checked all my fuses as well. I have no codes flashing either. As well it has now recently started to build up exhaust and blow it back out though the intakes butterfly valve. Prior to the crank no start it was bucking and stuttering pretty bad I replaced plugs and packs and the fault stopped until about 2 months later. The engine is cranking at a very low rate of speed (about 800rpm). I am so lost for what to do next. Any assistance would be greatly appreciated. I'm a mechanic for the military so if I'm slow at replying or compleating steps please forgive me I have a very busy schedual.
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Answered in 2 minutes by:
8/24/2017
Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
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Welcome, I'm Chris (aka Moose).

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You have verified the ignition spark is good, fuel pressure is good, and injector pulse is occurring, correct?

Was a compression test done?

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Customer reply replied 10 months ago
to everything except a compression test so far.

Since you have everything it needs to run. That leaves compression out of specs from a possible jumped timing concern. That can also be the source of the smoke out the intake. You also mentioned cranking speed at 800. That is very fast. Crank speed is normally about 250.

Now that I have posted a partial or complete answer, you will see you can rate me. The deposit you have already paid is not transferred to me until you rate me. I would like to receive nothing less than 5 star excellent ratings. So if we are not there yet, please reply and let me help more. If you're not pleased, let me know because rating bad does not result in a refund, there are better options. Rating now will not close this post nor prevent replying. Thanks Chris

Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
Satisfied Customers: 52,601
Experience: 16 years experience
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Customer reply replied 10 months ago
Sorry I meant 80 sorry. But I've been debating a timing issue I'll perform a compression test and check the vehicles timing. Thanks will keep posted.

Please do keep me posted.

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