6.0L Misfire..

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Aug 2, 2013 | 07:37 AM

#46

harris2108

Junior User

Joined: Sep 2005

Posts: 75

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From: Fort Rock, OR

If its possible to restart this thread I have a similar problem and used my AE to collect some data. However my problem is a miss between 1700 rpm and 2500 rpm, in park or cruising speed.

KOEO - icp 31.72psi IPR% 14.84 FICM 48

Idle - 635psi 23.05 48

2500rpm - 1380psi 47% 48

It has new HPOP, IPR, ICP sensor, FICM, fuel pressure spring kit, new lift pump, 3 new injectors, #1, #3, #5.

Any suggestions would be greatly appreciated.

Aug 6, 2013 | 12:47 PM

#47

WyoFlyFish

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Joined: Oct 2012

Posts: 7

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My truck never did it in park, only while under a load and hot, but it turned out to be a very simple fix. I replaced the EGR Valve. After great stress and headaches, it was as simple as $120 and 5 minutes to replace. I have about 800 miles on the truck without any trouble.

Good Luck, I hope yours is as simple.

Aug 7, 2013 | 04:54 PM

#48

harris2108

Junior User

Joined: Sep 2005

Posts: 75

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From: Fort Rock, OR

Checked and cleaned the egr, it was also replaced recently.

I changed out the injector wiring harness yesterday and still same problem exists.

I don't have much hair left to pull out!

Aug 7, 2013 | 06:57 PM

#49

04badford

Lead Driver

Joined: Sep 2012

Posts: 7,830

Likes: 96

From: Manteca,Ca

To those who have had bucking, surging, stalling and readings that are wack, take a look at the ICP pig tail, a wiggle test or may have to pull the connection theres a grey clip holding the three wires together you will see burn't or white looking wire corrosion.its time to replace. you wont always see bare wire . I hope this helps I grew gray hair chaseing the problem for almost 2yrs and the truck ran great cold when heated that's when things got weired. its always good to read data from your gauge it could very well be something else, but this is the most common

good luck and if you need more help on replacement ,I can help too.

Aug 8, 2013 | 12:22 PM

#50

WyoFlyFish

New User

Joined: Oct 2012

Posts: 7

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Where would I look for this pigtail? Is there any way I might have wiggled it when I replaced my EGR valve? Truck sure seems to run fine now.

Aug 9, 2013 | 12:36 AM

#51

04badford

Lead Driver

Joined: Sep 2012

Posts: 7,830

Likes: 96

From: Manteca,Ca

Quote:

Originally Posted by WyoFlyFish

Where would I look for this pigtail? Is there any way I might have wiggled it when I replaced my EGR valve? Truck sure seems to run fine now.

NO the ICP on a Early built 03/04 will be under the turbo upper side of Ficm,
late built 04 ICP will be on the passenger side valve/rocker cover, the connection close' to the senser will short under the grey clip. although with heat under the turbo wire will still short .with IPR connection. Make sure when replacement use heat wrap after all connection shrink tube is Installed.

Aug 9, 2013 | 03:55 PM

#52

WyoFlyFish

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Joined: Oct 2012

Posts: 7

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So that goes for the 06 models also? passenger side valve/rocker cover?

Aug 9, 2013 | 06:14 PM

#53

04badford

Lead Driver

Joined: Sep 2012

Posts: 7,830

Likes: 96

From: Manteca,Ca

Quote:

Originally Posted by WyoFlyFish

So that goes for the 06 models also? passenger side valve/rocker cover?

Yes Sir, the late built 04 and thru 06 is on the Passenger Valve cover

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Aug 19, 2013 | 12:55 PM

#54

WyoFlyFish

New User

Joined: Oct 2012

Posts: 7

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Is it possible to see a picture of the location on the later mods?
If I cant see it in the picture then I will know its behind the turbo...sigh

Aug 19, 2013 | 04:59 PM

#55

04badford

Lead Driver

Joined: Sep 2012

Posts: 7,830

Likes: 96

From: Manteca,Ca

Quote:

Originally Posted by 04badford

Yes Sir, the late built 04 and thru 06 is on the Passenger Valve cover

The ICP is the only thing threaded into the valve cover, the connection will be burnt at the grey clip before it connects to the ICP. What year of truck is yours? early built 04 back to 03 will be under the turbo and FICM some say its easyer to remove ficm and some say from under the truck . I would think if replaceing the pig tail I would want to see what I'm doing, Its real easy on the late built 04/06 from the top, In the tech folders on the main page is the 6.0 bible that will show where all sensers are plus some extras stuff to thumb thru

Aug 19, 2013 | 08:23 PM

#56

BLADE35

Hotshot

Joined: Apr 2010

Posts: 19,061

Likes: 238

From: Saratoga Springs,UT

Quote:

Originally Posted by WyoFlyFish

Is it possible to see a picture of the location on the later mods?
If I cant see it in the picture then I will know its behind the turbo...sigh

Bud Save this Link below its a 6.0L Bible link TONS of Pics and Info

6.0L Bible Table of Contents

see the Green Air Line that's 2005 ICP location

They are just doing a HPO Systemair test and removed ICP sensor to install the Air line

I have a 2004 6.0L Bible but it wouldn't let me Post the Pic and that's when the change was so its Not In the 2005 Updated changes Bible

And here is the PIC for 2003-2004 Early MY

This came from 6.0L Bible^^^^and there LOTS more in the LINK^^^

Aug 20, 2013 | 12:57 AM

#57

04badford

Lead Driver

Joined: Sep 2012

Posts: 7,830

Likes: 96

From: Manteca,Ca

Thank you Benny ( Blades)

I would send the baskit too but made a smoothy instead LOL

Aug 20, 2013 | 09:25 AM

#58

WyoFlyFish

New User

Joined: Oct 2012

Posts: 7

Likes: 0

Fantastic! Thank you so much!

Aug 25, 2013 | 05:46 PM

#59

WyoFlyFish

New User

Joined: Oct 2012

Posts: 7

Likes: 0

Well, it turned out to be both the EGR valve again and the TurboBoost sensor.

I changed the ICP and piggy and it did not help.

Thank you all for your input and help!!

Oct 10, 2013 | 12:59 PM

#60

harris2108

Junior User

Joined: Sep 2005

Posts: 75

Likes: 0

From: Fort Rock, OR

Problem found!!

Here is the update on my 2003 6.0L, stumble running rough when warm at 1700-2300 rpm problem. I found a piece of spring coil or wire stuck in the RH HP Oil Rail check valve. I assume this affected oil pressure stability at each injector and would not be recorded by the ICP. Hope this helps out.