6.0L Sluggish Acceleration Response From a Stop - Diesel Forum - TheDieselStop.com
6.0L Power Stroke Engine and Drivetrain Discussion of the 6.0L Power Stroke diesel engine and drivetrain in the 2003-Up Super Duties and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.0L Power Stroke engine.

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post #1 of 16 (permalink) Old 10-15-2018, 08:43 PM Thread Starter
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Question 6.0L Sluggish Acceleration Response From a Stop

Have the early 2003 6.0 Excursion.

PROBLEMS:

1. Hesitation from a stop after it warms up. The accelator can be to the floor and it will just creep for 2-3 seconds then it seems to "catch up" and moves! It also misfires after it is warmed up;



2. Has an "air leak" on the passenger side of the engine.

What's been REPLACED or CLEANED in the past three months:

1. EGR cooler

2. Oil cooler
3. Injectors were "re-ringed" (o-rings) and solenoids sanded and ohmed. All between .8 - 1.0 OHM
4. Fuel filters
5. MAF
6. Injector harness
7. EGR
8. Turbo dismantled and cleaned
9. EBPS



CURRENT READINGS:


1. Fuel pressure @ 52-55 under load.
2. FICM reading 48v


DIAGNOSING:


1. Performed a VGT Relearn. Still having the hesitation from a stopped position. After RPMs build-up to around 1200RPM, the engine takes off and runs normally UNTIL it gets warm. When it gets warm, the idle gets "rough" and it still hesitates from a stopped position. BUT, even when it's warm, it still runs normal--at higher RPMs--AFTER the 2-3 second delay once you start to accelerate from a stopped position.



Any ideas?? Fresh out over here!!
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post #2 of 16 (permalink) Old 10-16-2018, 10:19 AM
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Have you done a buzz test on the injectors?
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post #3 of 16 (permalink) Old 10-16-2018, 01:41 PM Thread Starter
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Yep. We did a buzz test. They're all loud and clear.
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post #4 of 16 (permalink) Old 10-16-2018, 10:20 PM
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What about a balance test?
Hows icp look?

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post #5 of 16 (permalink) Old 10-17-2018, 01:51 PM Thread Starter
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I do not have access to IDS or anything like that for the contribution test, all I have is the torque app, or Forscan which are lacking in that category.
The icp at idle is ranging around 630 to 680 at idle, and under load going down the road if I remember correctly around 1000 to 2000. I may be wrong on the last ones, but it runs great going down the road. Getting ready to do the Blue spring update to just bring the pressure up a bit just to be safe. VGT is between 20 and 75 %. APP sensor reads 0 to 99% with no fluctuations that I can see.
Map is running around 15 psi. A friend of ours is a Ford diag tech and he thought it might be the turbo sticking, but I had it apart and cleaned it all up and it actually looked really good. I am stumped
on this. It is not blowing smoke of any kind, and has a couple oil leaks but that's the least of my concerns. Starts right up in the cool morning runs smooth (lag still present) then warms up and starts missing a little at stop signs (lag still present) but runs good when rpm's get higher. CONFUSING!!!!
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post #6 of 16 (permalink) Old 10-17-2018, 03:45 PM
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Forscan will on the computer version, if you get the free extended license.
So I assume you are using a android, so download car gauge pro. That one can.

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2010 VW JETTA TDI DSG Kerma tune. Hankook ventus v2 concept 2.


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post #7 of 16 (permalink) Old 10-18-2018, 02:35 PM Thread Starter
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We just now got the free extended license (thanks for the heads up on that) for Forscan and will be running the checks tomorrow.
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post #8 of 16 (permalink) Old 10-18-2018, 03:50 PM
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How are your starts cold and hot any hard starts
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post #9 of 16 (permalink) Old 10-18-2018, 03:53 PM
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Just wondering because I had the almost exact same problem and the fix is not FUN AT ALL
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post #10 of 16 (permalink) Old 10-18-2018, 03:57 PM
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This maybe your culprit
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post #11 of 16 (permalink) Old 10-18-2018, 07:13 PM
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Which O-ring is that?
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post #12 of 16 (permalink) Old 10-19-2018, 12:20 AM Thread Starter
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No hard starts. Hot or cold, it starts great!
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post #13 of 16 (permalink) Old 10-19-2018, 12:22 AM Thread Starter
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Which o-ring is that?
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post #14 of 16 (permalink) Old 10-19-2018, 01:01 AM
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Probably not your problem it's the O-ring on top of the injectors the one the ball nipple seats into. That's what happens when you don't line up the ball nipples correctly the oil cavitates and basically blast the o ring ta pieces.
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post #15 of 16 (permalink) Old 10-19-2018, 08:16 AM
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Quote:
Originally Posted by Dangbob View Post
Probably not your problem it's the O-ring on top of the injectors the one the ball nipple seats into. That's what happens when you don't line up the ball nipples correctly the oil cavitates and basically blast the o ring ta pieces.
Ahh. Those o-rings are often referred to as D-Rings. In addition to what you've described, another root cause for them to fail is a bad nipple cup seal/o-ring. There are a bunch of youtube videos on this issue.
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