Some interesting tid-bits on engine operation

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Jan 16, 2012 | 10:32 PM

bismic

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Fleet Owner

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Some interesting tid-bits on engine operation

Here are some parameters where the 6.0L can/does defuel (some are model year dependent and caliration level dependent):

Defuel at 221 *F ECT (coolant temperature): PC/ED manual - page 1-34
Defuel at 253 *F EOT (oil temperature): PC/ED manual - page 1-34
Defuel at 4000 rpm's : PC/ED manual - page 1-13
Defuel at 95 mph: PC/ED manual - page 1-15
Defuel at 28.6 psig boost (possibly also need to be at or above 75 mph also)
Defuel when the fuel level in the tank gets very low (well after the low fuel light comes on - calibration level dependent).

To start:
The PCM needs to see 100 rpm to start.
500 psig (HPO pressure) is required to start which is around 0.82V to 0.84V (depends on what manual you read - some say 0.8v)
<TABLE style="WIDTH: 338pt; BORDER-COLLAPSE: collapse" border=0 cellSpacing=0 cellPadding=0 width=451 x:str><COLGROUP><COL style="WIDTH: 338pt; mso-width-source: userset; mso-width-alt: 16042" width=451><TBODY><TR style="HEIGHT: 13.2pt" height=18><TD style="BORDER-BOTTOM: #d4d0c8; BORDER-LEFT: #d4d0c8; BACKGROUND-COLOR: transparent; WIDTH: 338pt; HEIGHT: 13.2pt; BORDER-TOP: #d4d0c8; BORDER-RIGHT: #d4d0c8" height=18 width=451 align=left>Battery voltage below 9.5V and it typically won't start (Battery voltage "should never" drop below 11.5V)

<TABLE style="WIDTH: 338pt; BORDER-COLLAPSE: collapse" border=0 cellSpacing=0 cellPadding=0 width=451 x:str><COLGROUP><COL style="WIDTH: 338pt; mso-width-source: userset; mso-width-alt: 16042" width=451><TBODY><TR style="HEIGHT: 13.2pt" height=18><TD style="BORDER-BOTTOM: #d4d0c8; BORDER-LEFT: #d4d0c8; BACKGROUND-COLOR: transparent; WIDTH: 338pt; HEIGHT: 13.2pt; BORDER-TOP: #d4d0c8; BORDER-RIGHT: #d4d0c8" height=18 width=451 align=left>A PCM detected fault on two of the 3 Accelerator Pedal Position (APP) 3-track potentiometer sensor signals only allows the engine to operate at idle.</TD></TR></TBODY></TABLE>

</TD></TR></TBODY></TABLE>
Would love to hear from techs on the accuracy of these numbers (many times the PC/ED manual has mistakes).

Also would love to see more of these "control parameters" posted up!

Jan 16, 2012 | 10:40 PM

zhilton

Logistics Pro

Joined: Mar 2007

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From: Claremore, OK

The statue of limitation hasn't run out yet, so I can't give details of where/when/how long.

But I can confirm an '04 2WD (5R110, 3.73LS, LT265/75/R16E) will defuel at 95 mph in stock form. A TomTom GPS confirmed 95 mph as the actual ground speed; though the speedometer was showing 98mph.

Good information there Mark.

Jan 17, 2012 | 12:40 AM

High Binder

Posting Guru

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Great info Mark, I tried to rep you but I've got to spread it 'round a bit. This should be sticky'd..

Jan 17, 2012 | 01:03 PM

bpounds

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Joined: Aug 2006

Posts: 17,398

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From: Whittier, CA

Quote:

Originally Posted by bismic

Here are some parameters where the 6.0L can/does defuel (some are model year dependent and caliration level dependent):

Good info as always, Mark. Reps sent.

I can confirm that my '06 with the latest calibration WILL start when battery voltage is below 11.5. Way below. Definitely not recommended, but it started.

Jan 17, 2012 | 01:57 PM

w_huisman

Elder User

Joined: Dec 2007

Posts: 971

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From: IA MN SD

My voltage drops into the 10.x range when cranking. Time for new batteries?

Jan 17, 2012 | 02:04 PM

msgtg

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From: Rural WV

Yeah, great info Mark...SOS...I hafta wait before I can Rep you again.

Joe

Jan 17, 2012 | 02:40 PM

bpounds

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Joined: Aug 2006

Posts: 17,398

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From: Whittier, CA

Quote:

Originally Posted by w_huisman

My voltage drops into the 10.x range when cranking. Time for new batteries?

Maybe, but mine gets really close to the high tens when cranking, and my batteries are brand new. But that's just reading the PID on the Edge Insight. A guy probably should read that voltage right at the batteries while someone cranks it. Or better yet, a load test tells the real story.

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Jan 17, 2012 | 05:06 PM

KRDiesel

Cargo Master

Joined: Oct 2005

Posts: 2,599

Likes: 2

From: Farmington NM

I can verify this on a 03.

Defuel at 253 *F EOT (oil temperature): PC/ED manual - page 1-34

I would love to get a copy of this book.

Jan 17, 2012 | 07:19 PM

#10

Shaneb75

Strokin Okie

Joined: Apr 2004

Posts: 1,883

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From: Oklahoma

Quote:

Originally Posted by bpounds

Ditto- Mine will hit 10.5 for a second or two while cranking, (according to the SG). It then sets at 11.5 until the GP's shut off. I also have brand new batteries.

Oh and Thank you Mark!

Last edited by Shaneb75; Jan 17, 2012 at 07:20 PM. Reason: For got to give props...

Jan 17, 2012 | 10:08 PM

#11

w_huisman

Elder User

Joined: Dec 2007

Posts: 971

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From: IA MN SD

I saw 9.x during cranking tonite. Lookin more and more like new batts are in order.

Jan 17, 2012 | 10:23 PM

#12

firedaniel

More Turbo

Joined: Jan 2011

Posts: 699

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Is defuel the same as when the wrench light comes on while towing? I had that before I changed the oil cooler. Limp mode I think is what someone called it...

Daniel