Rough idle, no power- out of options - Ford Powerstroke Diesel Forum
Powerstroke.org is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 03-22-2014, 10:03 PM
Powerstroke.org Rookie
 

Join Date: Mar 2014
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Rough idle, no power- out of options

I've got a 2003 7.3 that I've been trying to troubleshoot for a week now. I don't have a code scanner so I'm struggling. I'm about to the point to pull it to the shop. Sorry for the lengthy post.

Symptoms:
It has a rough idle and very little power. Can't get it up to speed and shakes and vibrates while trying. After running it for 20-30 mins it begins running even harder and will die out completely. Won't start back for 30+ mins. According to the temp gun it's not firing on 1,3,4,5 cylinders (temp on these at exhaust much lower).

What I've done thus far:
I suspected UVCH issue on the passenger side. Removed VC and harness was disconnected a little but not as much as I had hoped. Disconnected and inspected and all looked normal. Nothing burnt. Reconnected. No change.

Pulled connector harness at IDM and ohm each injector. Each injector ohm at 2.3 with no variation between each bank. This was done with harness at VC connected and testing all the way to the injectors for resistance.

Replaced CPS. No changed.

Pulled ICP while running. No change. It did have oil on the harness and may need to be replaced but several suggested leaving it disconnected while running to see if issue clears up. Mine showed no change while disconnected and running.

Ohm each of the GPs from outside VC harness. Driver bank all showed around 1.8 while passenger bank all showed 4.1.

No smoke while idling. Small amount of blue while struggling to gain speed or under load but not a lot.

New fuel filter was installed a few weeks ago.

Any ideas on anything else to try? Could I have a IDM going bad? It's a pricy item to buy just to "test" with but I don't know any way to test it.

Thanks for any advice you can provide.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 03-23-2014, 01:08 AM
Compression Ignition Addict
 

Join Date: Jan 2009
Location: Almost to the Muck but not quite
Posts: 1,150
Thanks: 11
Thanked 41 Times in 41 Posts
Feedback Score: 0 reviews
Sounds like an IDM to me.

Rough idle, no power- out of options-imageuploadedbyautoguide1395565616.476312.jpg

Just type IDM on ebay and this will show up. Its a company out of Florida that refurbishes them and its not a bad price at all. $149 shipped. Best of Luck


Sent from AutoGuide.com App
Reply With Quote Quick reply to this message
  #3  
Old 03-23-2014, 06:44 AM
Compression Ignition Addict
 

Join Date: Dec 2007
Posts: 4,779
Thanks: 0
Thanked 75 Times in 70 Posts
Feedback Score: 3 reviews
If the UVCH and wiring are really OK, and you have a "cold" side on one of the manifolds (showing that sides not doing it's job) then the IDM would be the next suspect. I don't know a way of testing it and they Do fail (most often from getting water inside) But, it's an easy swap to ANY other 7.3 IDM as a Test.

If you know anyone with another running 7.3, ask them to come over and buy them Lunch. In a 1/2hr you can swap them back & forth and find out...
Reply With Quote Quick reply to this message
  #4  
Old 03-24-2014, 11:48 AM
Powerstroke.org Rookie
 

Join Date: Mar 2014
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Quote:
Originally Posted by NoRalPh View Post
If the UVCH and wiring are really OK, and you have a "cold" side on one of the manifolds (showing that sides not doing it's job) then the IDM would be the next suspect. I don't know a way of testing it and they Do fail (most often from getting water inside) But, it's an easy swap to ANY other 7.3 IDM as a Test.

If you know anyone with another running 7.3, ask them to come over and buy them Lunch. In a 1/2hr you can swap them back & forth and find out...
Thanks guys for the feedback. I think I may remove the IDM and check it for any visible signs of damage (water). I do have a cold side manifold (passenger) but it seems one cylinder on that side is firing (but the other 3 are not). It also seems there may be a single cylinder on the (driver) side not firing as well.

I keep going back to testing the injectors at the IDM harness. My thoughts are if they all ohm the same (@ 2.9) then it doesn't seem to suggest a UVC harness or any other wiring issues (at least shorted to ground) going to the injectors.

The problem I'm facing is without a something to check for codes I'm flying in the dark. I found a company called Swamp that I can send it in to check it. This may be the most economical route shy of taking it to the shop.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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:

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
Display Modes

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



All times are GMT -8. The time now is 04:22 AM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

vB.Sponsors