AE Test Results, Still Having Hot Start Issues

[Pwnm30rdi3]

Cylinder Cont. Test and Injector Buzz Test passed successfully, no codes throw during testing!
The only code the truck is throwing, is a Soft Code, "PO478 - Exhaust Pressure Control Valve High".

I then did a 50+mph WOT test while recording data, How does everything look?:

Time: 49:19 Accelerator Position: 77.66 RPM: 2146 ICP Pressure: 2373.45 Duty Cycle: 40.6
Time: 49:20 Accelerator Position: 77.66 RPM: 2635 ICP Pressure: 1735.97 Duty Cycle: 45.7
Time: 49:21 Accelerator Position: 77.66 RPM: 2886 ICP Pressure: 1989.95 Duty Cycle: 51.1
Time: 49:22 Accelerator Position: 77.66 RPM: 3099 ICP Pressure: 2419.84 Duty Cycle: 54.2

Thanks guys!

 

[David N]

Well I would think that your ICP could be alittle higher, I don't think that would cause a hot start issue.

Have you pulled the IPR and inspected it? If the orings on the IPR are torn and leaking by, that could cause a hot start problem.

 

[powerstrokenstang]

I say either ipr or hpop.

 

[Southmike]

code is the ebp sensor.. clean tube or replace sensor.
hpop look low to me but decent sized injectors..ipr nut on tight?

 

[Pwnm30rdi3]

Well I would think that your ICP could be alittle higher, I don't think that would cause a hot start issue.

Have you pulled the IPR and inspected it? If the orings on the IPR are torn and leaking by, that could cause a hot start problem.

I have not pulled the IPR yet. I will pull out the IPR and check for a snagged o-ring tomorrow!
Why do you suppose my ICP is so low?..
According to the data-log I think my ICP pressures spiked to like 3089 during a later test run. Does that sound a little more normal?

I say either ipr or hpop.

Both are brand new and the truck seems to run strong.. :/

code is the ebp sensor.. clean tube or replace sensor.
hpop look low to me but decent sized injectors..ipr nut on tight?

The ebp sensor is brand new and I also bought a brand new tube before dropping the motor back into the truck. I do have 2 tee's that split off the ebp tube, one controls the wastegate and the other goes to my aftermarket backpressure gauge.

IPR nut is on tight.

 

[2000wa250]

Injector O rings could be causing a hot start issue, as well as the lower ICP that your WOT run showed.

 

[Pwnm30rdi3]

Injector O rings could be causing a hot start issue, as well as the lower ICP that your WOT run showed.

How visible are leaky injector o-rings when the valve covers are off?
or Would you just recommend pulling each injector individually until I find a snagged o-ring?

 

[Southmike]

prob an old code then on the ebp.

 

[2000wa250]

How visible are leaky injector o-rings when the valve covers are off?
or Would you just recommend pulling each injector individually until I find a snagged o-ring?

If you have a buddy available, pull the VC's and try to start it when you're having the hot start issue. If the top O rings are shot, then you will visibly see oil leaking from around the collars on the injectors. I'm assuming when you are having the hot start issue you have checked to see if your HPOP res is full? If you have not, next time its warm and having a hard start, pull the plug on top of the res and see where your oil level is. If its more than an inch down, then you are leaking down somewhere. If that is the case the easy check for O rings or IPR is to pull one HPOP line from a head (do drivers side first) and tie the unplugged end up above the res. If the res still leaks down then plug it back in, unplug the passenger side and do the same thing. If it leaks down with the passenger side unplugged as well, then its IPR o rings or IPR related, if it doesnt leak down with passenger side unplugged then you have a busted o ring or worn o ring on the passenger side.

Hope this helps.

 

[golfer]

If you have a buddy available, pull the VC's and try to start it when you're having the hot start issue. If the top O rings are shot, then you will visibly see oil leaking from around the collars on the injectors. I'm assuming when you are having the hot start issue you have checked to see if your HPOP res is full? If you have not, next time its warm and having a hard start, pull the plug on top of the res and see where your oil level is. If its more than an inch down, then you are leaking down somewhere. If that is the case the easy check for O rings or IPR is to pull one HPOP line from a head (do drivers side first) and tie the unplugged end up above the res. If the res still leaks down then plug it back in, unplug the passenger side and do the same thing. If it leaks down with the passenger side unplugged as well, then its IPR o rings or IPR related, if it doesnt leak down with passenger side unplugged then you have a busted o ring or worn o ring on the passenger side.

Hope this helps.

good tip, though I'll add to disconnect the injectors (electrically) when cranking (hot)..

also remove any oil sitting down by the valvesprings

if you see any oil collecting down/below 'a' particular injector..then that would be the place/inj to start looking at.

hard to start when warm could literally be ANYthing in the HPOil system...

IPR (internal/mechanical issue)
IPR o-ring(s)
'a' injector (internal/mechanical problem)
'a' injector (external/o-ring issue)
'a' fitting/o-ring issue (under VC, assuming you don't have a puddle under the truck)

the HPOP itself

any losses of efficiency are going to be more pronounced with hot/thin oil..as more volume can be lost with hot/thin oil...preventing the HPOil SYSTEM from reaching its desired pressure.

no one can say 'what' component it is...as any one of these issues will manifest itself as being 100% identical...as simply..not enough ICP pressure when hot.

 

[2000wa250]

Thanks golfer!

Only reason I mentioned the injector o rings as a probable cause is I just had this happen with my rig. It would still start hot, but had to crank a few times for it to build the pressure. My thinking would be, if hes not having issues with the HPOP running the truck when the truck warms up, and its only starting, then he has a leak down issue of some kind.