Been a member for long time but first post. Great info to be read in this forum. But have not found answer yet so maybe some one has the same problem.

Truck is 2006 6.0 psd. Engine has been studded and typical parts updated, sct, stand pipe etc. Egr delete. Sct tuner. Scangauge 2. Engine runs great when running, lots of power.

The problem I'm having is the long crank times to start. When cold and plugged in it'll take probably 6 to 7 seconds to start and when up to operating temps still about 3 to 4 seconds. Couple of days ago i shut of engine for about 15 minutes and went to start it up and it just cranked longer than it ever has and didn't start. I tried again and it cranked for 10 seconds and started. Its never done that before or since. Some times when it starts its like engine builds up to rpms and other times it just fires hard and runs. Like its not getting enough of something. Hope that makes sense. Once engine starts it runs fine smooth and lots of power. Before work was done and after, it use to start first couple of cranks then after a few months or so it started taking longer to start.

Ive checked ipr and ipc with scan gauge and all are in spec. FICM is good. Batteries are new. Its running ford filters and 5-40 synthetic oil.

Could the anti drainback valve in filter housing cause this problem? Is it possible to have a HPO leak and still have ipr and ipc in spec? Does the HPO side of engine hold pressure when engine is not running? or is it meant to bleed off?

Hope it all makes sense any ideas would be appreciated. Thanks

 

is this happening just on the first start of the day and the rest of the day it's fine.
if so you are having a drain back issue it seems.what filter and cap are you using i will say if you are not using oem cap and filter there is your problem.but if you are then you may have an hpo leak starting to show it's face.here's how you see if you have a drain back issue.pull the filter and if it's dry then you know that is your pro longed crank in the morning.you need to do this first thing in the morning.oem spec for starting is under 5 seconds.

if you are 6-7 i wouldn't worry to much but if you start getting into the 10-15 second range then you have an issue starting to show it's face i hope this helps you figure it out.

 

First start of the day is always the longest and then once it warms up it doesnt crank as long but still for a few seconds or more. Filter and cap are ford products. I haven't checked the filter housing yet, will do it this weekend.
I know the crank time is probably in spec with oem but it use to start first couple of cranks cold or hot. If icp and ipr are within specs when starting and running would there be a HPO leak?

 

if the first start of the day is the longest that tells me you are starting to have or
do have a drain back issue.when you crank the truck in the mourning your low side has to fill up before it starts feeding the high side.if the low side misses a beat the high side will suck the low side dry almost or close to it then it's a game of catch up.

then during the day it starts good and when the oil gets warm you may have a small hpo leak just starting to show and it will get worse over time.the only way to fined it is to go in at look at all the hpo o rings. but most people opt to wait till the truck will not start or basically leaves them stranded.

 

Thanks for the help Excutioner. I checked filter housing this morning and the very bottom of filter had oil dripping off it but id probably say the rest was fairly dry. I looked at oil pressure gauge when i started it and it didn't move even once the engine was running for probably second or 2. I drove it for a bit then shut it down and restarted straight away and it fires first couple cranks but if left for 10 minutes or more its 3 to 4 like i said. I wouldn't think the oil could drain that fast.

I also have another problem now. Head gaskets or cracked head. I noticed coolant at degas bottle so put on pressure gauge and went for a drive. Pressure gauge sits at 14 psi doing 110km
and when i go WOT the gauge goes to 18 psi. That was with SCT performance tune. I stopped and put back to stock tune. I went to start up again then it just cranked for 10 plus seconds and i stopped and tried again. Once it started to fire i had to keep starter going for a second or so. Motor was only off long enough to change tune. Any way once i got going again the the pressure gauge never moved from zero doing 110 or WOT.

So id say i have a head problem. Maybe thats part of the long starts?
The reason I had the work done to motor to start with was to make it reliable. Didn't seem to have worked tho. Lol

 

There is a high pressure reserve under the oil cooler. It will run for a little bit without base engine oil pressure, like after you change your engine oil it has to fill the oil filter. What is the ipr at hot idle, 180 or above.