PCM Diode keeps blowing - 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 05-12-2014, 04:30 AM
Powerstroke.org Rookie
 

Join Date: May 2014
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Question PCM Diode keeps blowing

Hello. I have a 1999 f250 7.3 6 speed. I am having issues with my PCM diode located in the fuse box under the hood.

Every four months or so the truck will begin surging while pressing on the gas pedal. Once this happens the diode will blow within a few days and require replacement before the truck will start. When the diode does go the truck will turn over but the wait to start and check engine lights do not illuminate.

I have taken it to a shop numerous times and they always tell me it's the gas pedal assembly and it must be replaced. "I've replaced it three times now". I'm convinced this is a different issue. When the diode is replaced the truck runs like a champ. Any ideas?
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 05-13-2014, 08:08 AM
Compression Ignition Addict
 

Join Date: Dec 2007
Posts: 4,754
Thanks: 0
Thanked 73 Times in 68 Posts
Feedback Score: 3 reviews
OK First, I think you mean "Fuse"?? (certainly not "Diode"...)

So, is this Fuse 22 by any chance?

If not, EXACTLY which fuse is it?

If so, unplug the Fuel Heater Element in the bottom of the Filter Housing.
Reply With Quote Quick reply to this message
  #3  
Old 06-21-2014, 04:55 AM
Powerstroke.org Rookie
 

Join Date: Jun 2014
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
I too have a blown pcm "diode" have not found the cause, the engine is very hard starting cold and wont start at all right now. i have tried many things but no help. if i figure it out i will post it. i will also watch this thread in case you figure it out.
Reply With Quote Quick reply to this message
  #4  
Old 06-21-2014, 04:58 AM
Compression Ignition Addict
 

Join Date: Sep 2013
Posts: 966
Thanks: 1
Thanked 69 Times in 63 Posts
Feedback Score: 0 reviews
Quote:
Originally Posted by NoRalPh View Post
unplug the Fuel Heater Element in the bottom of the Filter Housing.
Do this. And most likely you have a bad glow plug relay also. The stock ones are junk.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Tags
computer, diode, electrical, pcm, won't start

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 08:27 PM.


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