Guess what? Another no-start thread
Thread Starter
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Trailering
Joined: Dec 2006
Posts: 21
Likes: 0
Guess what? Another no-start thread
OK, I think this one is different. 1st I have done hours of search and research on this site. Also have a decent background in diesel mechanics.
That being said here goes; 2007 bone stock 130k miles. "Grocery getter" rarely tow and when I do its a light ski boat on flat ground.
Cold starts good, normal performance. Hot starts are either extended cranking or no start at all. Cool down for an hour and fires right up.
Changed oil and filter with OEM cap.
Had a friend hook up AutoEnginuity on PC. No codes. Of coarse it was before I discovered that the start issue was only when hot. His test was after cool down so it didn't fail to start.
Readings at idle were;
ICP, I can't remember but it was high enough to start and increased with RPM. In the green.
IPR, 24% duty cycle. In the green.
FICM, 50.8v high and in the red.
So I'm thinking that HPOP is OK and probably no air leaks since IPR not trying to compensate for loss.
The only thing that sticks out is FICM voltage. And I know nothing about where or how that is regulated and if it could be heat related.
Anyone want to take a swing at this one?
Blain
That being said here goes; 2007 bone stock 130k miles. "Grocery getter" rarely tow and when I do its a light ski boat on flat ground.
Cold starts good, normal performance. Hot starts are either extended cranking or no start at all. Cool down for an hour and fires right up.
Changed oil and filter with OEM cap.
Had a friend hook up AutoEnginuity on PC. No codes. Of coarse it was before I discovered that the start issue was only when hot. His test was after cool down so it didn't fail to start.
Readings at idle were;
ICP, I can't remember but it was high enough to start and increased with RPM. In the green.
IPR, 24% duty cycle. In the green.
FICM, 50.8v high and in the red.
So I'm thinking that HPOP is OK and probably no air leaks since IPR not trying to compensate for loss.
The only thing that sticks out is FICM voltage. And I know nothing about where or how that is regulated and if it could be heat related.
Anyone want to take a swing at this one?
Blain
Hotshot
Joined: Apr 2010
Posts: 19,060
Likes: 238
From: Saratoga Springs,UT
your symtoms sound like a HPO Leak
I take it you had the AE Hooked up to the truck and it was running????
If so you need to take ICP and IPR% readings when it Wont start
And Also do this Hope you still have the AE or a Gauge anyways
OPERATING VALUES
Just make shure the numbers are taken exactly like this
Truck in PARK OR NEUTRAL all times during test
ECT at 190* or close to And EOT at 185* or higher
A/C OFF
----------------------------------------------------------------------------------
#1-------KOEO=Key On Engine Off =record EACH sensor value and POST IT!!
#2-------Low Idel (truck idel on its own)=record EACH sensor value and POST IT!!
#3-------High Idel (2500RPM)=record EACH sensor value and POST IT!!
Take Values for these sensor
ICP
ICPV
IPR%
FICM MP
FICM LP
FICM VP
Volt
If it has A HPO Leak it should show taking the sensor values like this^^^^^
The FICM at 50volts dont worrey me to bad. Do you have one of those AfterMarket FICMs from Swamps or anything???????????
A 2007 MY need to have the Updated HPO Parts installed
STC
Standpipes
Dummey Plugs
Have you done any of these 3^^
I take it you had the AE Hooked up to the truck and it was running????
If so you need to take ICP and IPR% readings when it Wont start
And Also do this Hope you still have the AE or a Gauge anyways
OPERATING VALUES
Just make shure the numbers are taken exactly like this
Truck in PARK OR NEUTRAL all times during test
ECT at 190* or close to And EOT at 185* or higher
A/C OFF
----------------------------------------------------------------------------------
#1-------KOEO=Key On Engine Off =record EACH sensor value and POST IT!!
#2-------Low Idel (truck idel on its own)=record EACH sensor value and POST IT!!
#3-------High Idel (2500RPM)=record EACH sensor value and POST IT!!
Take Values for these sensor
ICP
ICPV
IPR%
FICM MP
FICM LP
FICM VP
Volt
If it has A HPO Leak it should show taking the sensor values like this^^^^^
The FICM at 50volts dont worrey me to bad. Do you have one of those AfterMarket FICMs from Swamps or anything???????????
A 2007 MY need to have the Updated HPO Parts installed
STC
Standpipes
Dummey Plugs
Have you done any of these 3^^
Last edited by BLADE35; Oct 27, 2012 at 09:06 PM. Reason: info added
Thread Starter
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Trailering
Joined: Dec 2006
Posts: 21
Likes: 0
Will get acces to the PC next week. Won't shut it off until then
No aftermarket parts. Dealer installed turbo at 99,990 miles. (I waited to see if anything else was going to crap out) Now thatI say that, I'll need to look up the work order. Seems like the STC was done....
So why wouldn't we see a higher duty cycle on the IPR if there was a leak?
Blain
No aftermarket parts. Dealer installed turbo at 99,990 miles. (I waited to see if anything else was going to crap out) Now thatI say that, I'll need to look up the work order. Seems like the STC was done....
So why wouldn't we see a higher duty cycle on the IPR if there was a leak?
Blain
Hotshot
Joined: Apr 2010
Posts: 19,060
Likes: 238
From: Saratoga Springs,UT
Will get acces to the PC next week. Won't shut it off until then
No aftermarket parts. Dealer installed turbo at 99,990 miles. (I waited to see if anything else was going to crap out) Now thatI say that, I'll need to look up the work order. Seems like the STC was done....
So why wouldn't we see a higher duty cycle on the IPR if there was a leak?
Blain
No aftermarket parts. Dealer installed turbo at 99,990 miles. (I waited to see if anything else was going to crap out) Now thatI say that, I'll need to look up the work order. Seems like the STC was done....
So why wouldn't we see a higher duty cycle on the IPR if there was a leak?
Blain
Could be how you tested it Truck was Cooled down and I assume No Values were taken at High Idel (2500rpm)
What was EOT when you took ICP and IPR% Readings?????????
I see this All the time Folks get there sensor values when the trucks running Fine when they really should get the operating values During the Problem. Intermittened Problems Suck
You Might have a Higher Duty cycle When truck is at Normal Operating temp
Thats why I posted the Very Specific Detailed way to get the operating Values in post #2
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Hotshot
Joined: Apr 2010
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From: Saratoga Springs,UT
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Fleet Owner
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50V on a OEM FICM is not the proper voltage either. Maybe Ed can jump in on this (why would an OEM FICM have higher than intended voltage), but I would watch that! Anyway - add me to the "HPO leak list".
The late model 6.0L's are GREAT trucks - just take care of the HPO system leak points. I wish I had a low mileage 07 (as a second truck)!
The late model 6.0L's are GREAT trucks - just take care of the HPO system leak points. I wish I had a low mileage 07 (as a second truck)!
Lead Driver
Joined: Mar 2010
Posts: 5,505
Likes: 256
From: Woodbridge, Ontario, CA
50V on a OEM FICM is not the proper voltage either. Maybe Ed can jump in on this (why would an OEM FICM have higher than intended voltage), but I would watch that! Anyway - add me to the "HPO leak list".
The late model 6.0L's are GREAT trucks - just take care of the HPO system leak points. I wish I had a low mileage 07 (as a second truck)!
The late model 6.0L's are GREAT trucks - just take care of the HPO system leak points. I wish I had a low mileage 07 (as a second truck)!
Thread Starter
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Trailering
Joined: Dec 2006
Posts: 21
Likes: 0
Bare with me. Not sure how to utilize AE to its full potential.
Engine hot
KOEO;
ICPV .25
IPR% 14.84
FICM VP 49-50 consistant
Fires right up
ICPV .59-2.37
IPR% 22.6-84.77 (RPM 550-2500)
Shut down
KOEO
ICPV .25
IPR% 9.77<<<<<NOTICE< p> Cranks for entended period IPR stuck 9.77%, ICPV .28-.40
Then we used the command "IPR 30%"
Fired right off.
We saved the file in Excel, can't post it here.
So, what controls the duty cycle of the IPR? Once it was "told" to be at 20% it would fire off perfect.
I can't buy the HPOP leak.
Blain
Engine hot
KOEO;
ICPV .25
IPR% 14.84
FICM VP 49-50 consistant
Fires right up
ICPV .59-2.37
IPR% 22.6-84.77 (RPM 550-2500)
Shut down
KOEO
ICPV .25
IPR% 9.77<<<<<NOTICE< p> Cranks for entended period IPR stuck 9.77%, ICPV .28-.40
Then we used the command "IPR 30%"
Fired right off.
We saved the file in Excel, can't post it here.
So, what controls the duty cycle of the IPR? Once it was "told" to be at 20% it would fire off perfect.
I can't buy the HPOP leak.
Blain
Hotshot
Joined: Apr 2010
Posts: 19,060
Likes: 238
From: Saratoga Springs,UT
Or I didnt read it right
get values like this
OPERATING VALUES
Just make shure the numbers are taken exactly like this
Truck in PARK OR NEUTRAL all times during test
ECT at 190* or close to And EOT at 185* or higher
A/C OFF
----------------------------------------------------------------------------------
#1-------KOEO=Key On Engine Off =record EACH sensor value and POST IT!!
#2-------Low Idel (truck idel on its own)=record EACH sensor value and POST IT!!
#3-------High Idel (2500RPM)=record EACH sensor value and POST IT!!
Test Again just like this^^^
ICP
ICPV
ICP Desired to
IPR%
FPW this one check mainly when it wont start see if stuck on 0
And if it will only crank then post Values During CRANK at this time will be the Bad Reading somewhere
get values like this
OPERATING VALUES
Just make shure the numbers are taken exactly like this
Truck in PARK OR NEUTRAL all times during test
ECT at 190* or close to And EOT at 185* or higher
A/C OFF
----------------------------------------------------------------------------------
#1-------KOEO=Key On Engine Off =record EACH sensor value and POST IT!!
#2-------Low Idel (truck idel on its own)=record EACH sensor value and POST IT!!
#3-------High Idel (2500RPM)=record EACH sensor value and POST IT!!
Test Again just like this^^^
ICP
ICPV
ICP Desired to
IPR%
FPW this one check mainly when it wont start see if stuck on 0
And if it will only crank then post Values During CRANK at this time will be the Bad Reading somewhere
Post Fiend
Joined: Oct 2009
Posts: 12,123
Likes: 35
From: N. Fort Worth, tx
not exactly true, however this is the case about 90% of the time. i have seen more then one set leak when cold and seal when hot. kinda makes you wonder sometimes.