06 6.0 long crank

[ebyrd10000]

Hi I have a 06 6.0 that has had a slight bucking at @ 1500 rpm never figured out the problem no it has a long crank to start around 5 or 6 seconds on the initial startup after it is warm it starts in 2 to 3 seconds but after it sets awhile i get the long crank again I just recieved my AE Scanner not sure how to use it to diag this problem any help would be appreciated

[thomaslord84]

Could be stiction or FICM. Since it gets better when it is warm, I'll say stiction. Get you some Rev-x and use it. Also the next time you change your oil put a good 5w-40 FULL SYNTHETIC in. I have used Rev-x and it solved my stiction issue very quickly.
Do a search up there in the search bar for FICM test and it will tell you how to test your FICM. I have never used an AE scanner, but if it is a good one, it can monitor you FICM voltage for you. It should never under any circumstances drop under 46v.

[ebyrd10000]

ficm test good i thought stiction was a injector thing this is like the hpop is loosing pressure?

[ruger#1]

Might be your SCT fitting or the O rings on the dummy plugs. You might have to do a pressure test.

[HAM_RADIO_MAN]

Originally Posted by ebyrd10000

ficm test good i thought stiction was a injector thing this is like the hpop is loosing pressure?

On a 6.0 the injectors are just the end of the line for the high pressure oil system. Inside this engine you are in effect using, used motor oil in a hydraulic power application, to drive the injectors. This is the most abusive thing I have ever seen, It is vitally important to use the best oil you can get and change it on time. My best explanation for stiction is the varnish and other crud in oil builds up inside the injectors and causes them to work in a stiff kind of fashion until the oil warms up. The best advise on this is go to a good 5w40 Full synthetic oil and pour in some REV-X. This does not sound like the classic signs of a high Pressure oil leak, In that case it is hard to start when warm not cold.

What is your FICM voltage when cranking? Have you load tested your batteries. Are you using a Motorcarft oil filter? If the drain back valve inside the oil filter housing is not being held closed by the filter this can cause the very problem you are talking about. Do an oil change with the 5w40 and REV-X and a OEM filter and That might just solve your issue.