I have a 06 F350 216k miles on her and I have noticed it is getting harder to start lately when the truck is warm. I have the updated STC and dummy plugs replaced about 16k miles ago. I have a Scanguage on the truck and have been monitoring everything. FICM is new and shows good voltage. Oil filter is motorcraft with motorcraft cap. Fuel filters changed with Racor filters. All these changed 3000 miles ago. At idle The icp is at 580 and icr is about 22-23 the numbers look good best I can tell. Icv I noticed seems to fluctuate at idle as low as .70 but is normally around .83

I'm kind of stuck as too why it seems to take longer to crank when it's warm. It used to take 1 sec bump of the starter when warm. Now its taking 5-8 sec. its not constant though. Feels like the oil is draining back and having to be pumped back up.

Any suggestions?

 

whats the Batteries amps separated?

 

<p>Have you tried parking nose down to see if that makes a difference?</p>

 

Batteries are new less than 2 months and just had them tested they are good. I haven't tried parking nose down. The ground is very flat around here lol

 

How old is air filter, also try cleaning IAT2 senser

 

I know on the old style HPOP sometimes the oil will leak past a shaft seal draining the HPOP reservoir causing long starts and parking nose down can confirm this if you get a shorter crank time by parking nose down.

 

This is going to be out of left field because I've just started to test a theory. How long have you been monitoring with your scangauge and how many gauges have you loaded?

Here's the reason I ask: I have a ton less miles and perfect across the board numbers as well. But I noticed longer warm crank times too. I recently added a bunch more gauges to my real time torque dashboards and have been particularly watching KOEO through start and the first minute or so after start.

My theory, that I haven't had time to prove out, is that the PCM is busy serving too many customers if Torque is up and interrogating it at start-up, and it's taking it longer to start because of that. I don't know if there is any priority to requests and processing done by the PCM, does anyone else? And does this make any sense?

I haven't had time to try back to back (or fairly close) warm starts, timing with Torque up and with it off. But it definitely is something I had noticed -- you kind of get used to how long to hold the key @ start, so when you let go and it hasn't caught, you tend to start noticing.

firedaniel: hope I didn't side track your thread; I was planning on doing some testing 1st and then pose this to the group here -- and then here is your thread...

 

How long do you KOEO before you start cranking? See if there is a difference between when you KOEO only long enough for the glow plug light to turn off, versus KOEO for about 20 sec, then start... It's possible that your fuel filters are just starting to get more restrictive, taking it a second longer to build up to starting pressure, but 10 seconds doesn't sound terribad.

Dan - That's an interesting theory there. I would be surprised if this were happening, but let us know what you find.

 

Scott its funny that you had brought this up and it does make sense that the PCM could be hosting or being cross checked with some thing else trying to get data you have my attentionOOPs, sorry fire daniel didn't mean to

 

The only thing I have is a scanguage with 6-7 xguages loaded. But I have had it for a couple of years and it hasn't been a problem.

It is turning over fine and sounds like it wants to start just seems like it won't catch...

The filters only have 3000 miles on them. I have the blue spring too.

I unplugged the icp and no difference. Could it be the ipr? That's what I'm leaning towards.

 

and your getting fuel in the upper bowl, try draining water sep? see what come out of that.

 

Well there goes that theory...

Did you replace the IPR screen when you did the STC? It should have come in the kit..

 

You know it has been acting up on this tank of fuel. I'll check the separator and add some cetane and see if it makes a difference. Guess I should think the simple things first. I just came back from a 2500 mile trip hauling a trailer. It. Never gave me a single issue. It has started since I got home.

 

Yes I replaced the screen on the IPR when the STC was done. Just wondering if it could be a sensor problem.