Idles fine, misses under throttle - Ford Powerstroke Diesel Forum
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 31 Old 06-14-2013, 10:30 AM Thread Starter
Compression Ignition Addict
 
atvrider93's Avatar
 
Join Date: May 2010
Location: Raleigh, NC
Posts: 3,835
Thanks: 12
Thanked 12 Times in 12 Posts
Mentioned: 0 Post(s)
Quoted: 8 Post(s)
Feedback Score: 0 reviews
Idles fine, misses under throttle

First off, a couple weeks ago the truck initially dropped a cylinder or 2 or however many for a few seconds. truck was warm but had been sitting for maybe 30min so not hot. This happened about 1/4mi up the road and seemed like it was when I let off the go pedal. let it idle for a few seconds and it straightened itself out. Got another 1/4 mile or so and same exact thing. turned around and headed home. During each of these the CEL came on and went off as soon as it cleared up

I later did some testing to see what did what. I replaced the CPS, no change. Unplugging either of the passenger side UVCH plugs reproduces the symptoms but without the CEL and when I rev it to reproduce, the symptoms don't get any worse. The driver side plugs do the same thing but when I rev it to reproduce the symptoms, it fires on even fewer cylinders and eventually dies.

I can reliably reproduce symptoms by revving it to a bit over 1000 RPM and letting off. Haven't tried any higher. If I don't rev it quite as high it will do it but won't do it as long it seems like. It varies in how long it continues running rough. IT will idle all day long no problem.

I replaced the passenger side valve cover gasket and the two harnesses under the VC and symptoms persist.

Last week I bought AE to figure this out and here are my results.

Ok so ae is hooked up. Initial codes were as follows:
P1280 icp sensor circuit low
P0113 intake air temp circuit high input
P0470 exhaust pressure sensor

KOEO produced:
P0113
P0475

KOER:
P0476 exhaust pressure control valve range/performance

CCT produced no codes until i started unplugging uvch connectors.
With the cyl 1&3 connector unplugged i got:
P0263 cyl1 contribution/balance fault
P0269 cyl3
P0275 cyl5

With the 5&7 connector unplugged:
P0275 cyl5
P0281 cyl7

With 2&4 unplugged the truck shut off during the test.

With 6&8 unplugged, no codes for some reason. Wanted to shut off it seemed like.

It doesn't seem like it's storing the code that triggers the CEL when symptoms are present unless I'm just not doing something right.

I'm at a loss here guys, any help is very much appreciated!

1996 F350 4x4 CCLB-- I'll miss her

1996 F350 4X4 RCLB zf5 213K
6637
OBA w/horn
DE 5"
PHP tunes
Mud Country 315/75/16

2008 Wr250X

Quote:
Originally Posted by belz View Post
There u go Tom. John may not be sexy, but he can tutor you, lol.
atvrider93 is offline  
post #2 of 31 Old 06-14-2013, 11:32 AM
Hillbilly Deluxe

 
STROKED_NY_023's Avatar
 
Join Date: Oct 2009
Location: Oxford, NY
Posts: 2,996
Thanks: 3
Thanked 5 Times in 5 Posts
Mentioned: 0 Post(s)
Quoted: 2 Post(s)
Feedback Score: 3 reviews
Have you checked fuel pressure under load?

_____________________________________________
Seth

Stroked_NY_023
95' F-350 CCLB DRW POWERSTROKE
08 Axle/4x4 conversion, 5spd conversion, 6637, 5" SP exhaust, gearhead tunes
.]
STROKED_NY_023 is offline  
post #3 of 31 Old 06-14-2013, 01:07 PM Thread Starter
Compression Ignition Addict
 
atvrider93's Avatar
 
Join Date: May 2010
Location: Raleigh, NC
Posts: 3,835
Thanks: 12
Thanked 12 Times in 12 Posts
Mentioned: 0 Post(s)
Quoted: 8 Post(s)
Feedback Score: 0 reviews
Quote:
Originally Posted by STROKED_NY_023 View Post
Have you checked fuel pressure under load?
I didn't really pay attention to fuel pressure while driving but when it does it in neutral the fuel pressure doesn't do anything weird. Stays right at about 70psi

Sent from AutoGuide.com Free App

1996 F350 4x4 CCLB-- I'll miss her

1996 F350 4X4 RCLB zf5 213K
6637
OBA w/horn
DE 5"
PHP tunes
Mud Country 315/75/16

2008 Wr250X

Quote:
Originally Posted by belz View Post
There u go Tom. John may not be sexy, but he can tutor you, lol.
atvrider93 is offline  
post #4 of 31 Old 06-14-2013, 03:27 PM
Hillbilly Deluxe

 
STROKED_NY_023's Avatar
 
Join Date: Oct 2009
Location: Oxford, NY
Posts: 2,996
Thanks: 3
Thanked 5 Times in 5 Posts
Mentioned: 0 Post(s)
Quoted: 2 Post(s)
Feedback Score: 3 reviews
Fuel pressure under load can be very different, but it doesn't sound lime that's your issue... Did you inspect all uvch harness really well for bare wires?

Sent from AutoGuide.com App

_____________________________________________
Seth

Stroked_NY_023
95' F-350 CCLB DRW POWERSTROKE
08 Axle/4x4 conversion, 5spd conversion, 6637, 5" SP exhaust, gearhead tunes
.]
STROKED_NY_023 is offline  
post #5 of 31 Old 06-14-2013, 03:45 PM
Electrical Ogre
 
alberta 7.3's Avatar
 
Join Date: Aug 2007
Location: Calgary, Alberta
Posts: 12,135
Thanks: 30
Thanked 79 Times in 76 Posts
Mentioned: 1 Post(s)
Quoted: 103 Post(s)
Feedback Score: 1 reviews
Go into AE and do a KOEO buzz test. That will tell you if you have a weak/disconnected injector.

With AE hooked up, take the truck for a drive, data log TPS, ICP, IPR %, and EBP.

Look at the results once you are parked. Make sure the ICP seems to follow the driving habit (ICP climbs immediately when throttle mashed then taper off.) Watch the EBP to see if it "sort of" mimics what you'd see your boost gauge do.

Bill

1996 F250 SC/SB 4X4 XLT
1997 F250 RC/SB 2WD project
2008 F350 CC/LB 4X4 DRW Lariat, 3" cow catcher mod
2008 Ranger SC FX4
Quote:
Originally Posted by weareweird69 View Post
If your posting pictures bill, everyone dim their screens, that CAT YELLOW is bright
Quote:
Originally Posted by Fordman247365 View Post
Is there anything you DONT take apart and **** with?
Quote:
Originally Posted by JJFLASH View Post
I still say that those Dodge mirrors have as much business on a OBS Ford as yoga pants have on a fat chick...my .02
alberta 7.3 is offline  
post #6 of 31 Old 06-14-2013, 04:27 PM Thread Starter
Compression Ignition Addict
 
atvrider93's Avatar
 
Join Date: May 2010
Location: Raleigh, NC
Posts: 3,835
Thanks: 12
Thanked 12 Times in 12 Posts
Mentioned: 0 Post(s)
Quoted: 8 Post(s)
Feedback Score: 0 reviews
Quote:
Originally Posted by alberta 7.3 View Post
Go into AE and do a KOEO buzz test. That will tell you if you have a weak/disconnected injector.

With AE hooked up, take the truck for a drive, data log TPS, ICP, IPR %, and EBP.

Look at the results once you are parked. Make sure the ICP seems to follow the driving habit (ICP climbs immediately when throttle mashed then taper off.) Watch the EBP to see if it "sort of" mimics what you'd see your boost gauge do.
Did the buzz test multiple times, never any codes. I think that's because it's not constant. Is there a way to measure pike change in inertia by cylinder?

I'll do the data log and see what that turns up.

Sent from AutoGuide.com Free App

1996 F350 4x4 CCLB-- I'll miss her

1996 F350 4X4 RCLB zf5 213K
6637
OBA w/horn
DE 5"
PHP tunes
Mud Country 315/75/16

2008 Wr250X

Quote:
Originally Posted by belz View Post
There u go Tom. John may not be sexy, but he can tutor you, lol.
atvrider93 is offline  
post #7 of 31 Old 06-14-2013, 04:29 PM Thread Starter
Compression Ignition Addict
 
atvrider93's Avatar
 
Join Date: May 2010
Location: Raleigh, NC
Posts: 3,835
Thanks: 12
Thanked 12 Times in 12 Posts
Mentioned: 0 Post(s)
Quoted: 8 Post(s)
Feedback Score: 0 reviews
Quote:
Originally Posted by STROKED_NY_023 View Post
Fuel pressure under load can be very different, but it doesn't sound lime that's your issue... Did you inspect all uvch harness really well for bare wires?

Sent from AutoGuide.com App
I didn't check the drivers side at all, replaced the passenger side gasket and two harnesses. Didn't bother checking the drivers side because it seems like the problem is on the passenger side.

Sent from AutoGuide.com Free App

1996 F350 4x4 CCLB-- I'll miss her

1996 F350 4X4 RCLB zf5 213K
6637
OBA w/horn
DE 5"
PHP tunes
Mud Country 315/75/16

2008 Wr250X

Quote:
Originally Posted by belz View Post
There u go Tom. John may not be sexy, but he can tutor you, lol.
atvrider93 is offline  
post #8 of 31 Old 06-14-2013, 05:02 PM
Electrical Ogre
 
alberta 7.3's Avatar
 
Join Date: Aug 2007
Location: Calgary, Alberta
Posts: 12,135
Thanks: 30
Thanked 79 Times in 76 Posts
Mentioned: 1 Post(s)
Quoted: 103 Post(s)
Feedback Score: 1 reviews
I'm not sure if a buzz test will create a DTC. The big thing is to listen to see if they all sound off with the same strength.

Bill

1996 F250 SC/SB 4X4 XLT
1997 F250 RC/SB 2WD project
2008 F350 CC/LB 4X4 DRW Lariat, 3" cow catcher mod
2008 Ranger SC FX4
Quote:
Originally Posted by weareweird69 View Post
If your posting pictures bill, everyone dim their screens, that CAT YELLOW is bright
Quote:
Originally Posted by Fordman247365 View Post
Is there anything you DONT take apart and **** with?
Quote:
Originally Posted by JJFLASH View Post
I still say that those Dodge mirrors have as much business on a OBS Ford as yoga pants have on a fat chick...my .02
alberta 7.3 is offline  
post #9 of 31 Old 06-14-2013, 08:01 PM Thread Starter
Compression Ignition Addict
 
atvrider93's Avatar
 
Join Date: May 2010
Location: Raleigh, NC
Posts: 3,835
Thanks: 12
Thanked 12 Times in 12 Posts
Mentioned: 0 Post(s)
Quoted: 8 Post(s)
Feedback Score: 0 reviews
From what i can tell they all sound about the same.

Sent from AutoGuide.com Free App

1996 F350 4x4 CCLB-- I'll miss her

1996 F350 4X4 RCLB zf5 213K
6637
OBA w/horn
DE 5"
PHP tunes
Mud Country 315/75/16

2008 Wr250X

Quote:
Originally Posted by belz View Post
There u go Tom. John may not be sexy, but he can tutor you, lol.
atvrider93 is offline  
post #10 of 31 Old 06-15-2013, 05:20 AM
Hillbilly Deluxe

 
STROKED_NY_023's Avatar
 
Join Date: Oct 2009
Location: Oxford, NY
Posts: 2,996
Thanks: 3
Thanked 5 Times in 5 Posts
Mentioned: 0 Post(s)
Quoted: 2 Post(s)
Feedback Score: 3 reviews
Have you checked all the easy stuff??? IPR can cause these symptoms as well.

Check this vid here for an easy cleaning rebuild to rule it out...

IPR Rebuild - 7.3L Powerstroke - YouTube

Here is the rebuild kit...

#14-007 IPR Re-Seal kit 94-03 7.3L Diesel

_____________________________________________
Seth

Stroked_NY_023
95' F-350 CCLB DRW POWERSTROKE
08 Axle/4x4 conversion, 5spd conversion, 6637, 5" SP exhaust, gearhead tunes
.]
STROKED_NY_023 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome