7.3 Cold Starts - 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 11-29-2010, 06:41 PM
Powerstroke.org Rookie
 

Join Date: Nov 2010
Location: Northford,CT
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
7.3 Cold Starts

Im having alot of trouble with my 2001 F-350 7.3. I have 6 inch stacks with a muffler on it. The weather is changing and the temps are low at night and it is giving me alot of trouble with my cold starts. Its been going below 20 every night and when i start my truck in the morning it has alot of trouble heating up. It makes super loud hissing noises right away but it is not constant, it does it on and off quickly. I let it warm up for 15 mins and when i pull away it does the hissing sound and takes all my power away. Im new to diesels and dont know where to start. Im going to purchase REV-X to add to the oil to help clean the injectors and i wanted to know if its worth buying? Any help would be great.

Last edited by powerstroke steveo; 11-29-2010 at 06:44 PM.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 11-29-2010, 06:46 PM
Compression Ignition Addict
 

Join Date: Jan 2007
Location: Santa Rosa, CA
Posts: 2,026
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
it's your exhaust back pressure valve closing. it cause the engine to work harder so that it will heat up faster, one side affect is some loss of power. i have disconnected mine.
Reply With Quote Quick reply to this message
  #3  
Old 11-29-2010, 06:47 PM
Premium Member


 

Join Date: Dec 2008
Location: Aberdeen, WA
Posts: 6,007
Thanks: 8
Thanked 40 Times in 32 Posts
Feedback Score: 9 reviews
not sure about the rev-x but you may have a bad glow plug or 2 that's giving you the starting trouble. the hissing noise is usually just the warm up valve but it's not supposed to do that once you're moving cause as soon as you touch the throttle it shuts off. not sure what that is.

i'd start with the glow plugs. if you need an explaination on testing them i'd be glad to help
Reply With Quote Quick reply to this message
  #4  
Old 11-29-2010, 06:49 PM
Powerstroke.org Rookie
 

Join Date: Jul 2010
Location: Kansas City
Posts: 29
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Just sounds like the high idle to me. My truck when its real cold out does the same thing. Even after its warmed up it will go into high idle while driving when your not making no boost. Then when you give it gas it stops then goes back in.
Reply With Quote Quick reply to this message
  #5  
Old 11-29-2010, 06:53 PM
Powerstroke Techie

 

Join Date: Oct 2007
Location: Saint Cloud, WI
Posts: 4,455
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
Quote:
Originally Posted by 7.34ever View Post
not sure about the rev-x but you may have a bad glow plug or 2 that's giving you the starting trouble. the hissing noise is usually just the warm up valve but it's not supposed to do that once you're moving cause as soon as you touch the throttle it shuts off. not sure what that is.

i'd start with the glow plugs. if you need an explaination on testing them i'd be glad to help
The exhaust back pressure valve can be activated by the pcm when you are cruising through town at low speeds and low power demand. I unplugged mine also simply because it irritated me by kicking in when it was partially warmed up.
I would definitely start by checking your glow plug relay. The best way that I've found is to hook up your meter leads on the 2 big lugs of the glow plug relay and cycle the key on with the engine cold. The voltmeter should read less then .2 volt. If it reads more then it is faulty.
And I would also replace your thermostat if it doesn't heat up to the middle of the normal range within a reasonable amount of miles.
Reply With Quote Quick reply to this message
  #6  
Old 11-29-2010, 06:57 PM
Premium Member


 

Join Date: Dec 2008
Location: Aberdeen, WA
Posts: 6,007
Thanks: 8
Thanked 40 Times in 32 Posts
Feedback Score: 9 reviews
Quote:
Originally Posted by forddieseldoctor View Post
The exhaust back pressure valve can be activated by the pcm when you are cruising through town at low speeds and low power demand. I unplugged mine also simply because it irritated me by kicking in when it was partially warmed up.
I would definitely start by checking your glow plug relay. The best way that I've found is to hook up your meter leads on the 2 big lugs of the glow plug relay and cycle the key on with the engine cold. The voltmeter should read less then .2 volt. If it reads more then it is faulty.
And I would also replace your thermostat if it doesn't heat up to the middle of the normal range within a reasonable amount of miles.
just for my info, if the gp relay was bad, would the truck even start in those temps?
Reply With Quote Quick reply to this message
  #7  
Old 11-29-2010, 07:06 PM
Powerstroke.org Rookie
 

Join Date: Nov 2010
Location: Northford,CT
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
The exhaust back presure valve closes and opens constanly when i start it up. It makes weird noises. How can i disconect that so it dosent happen, id like the rev but not all the noise. And yes while i am driving it makes really loud hissing noises when i am easy on the gas, enought to where i have to pull over. I will check my glow plug relay. It runs fine once it is warmed up but that isnt untill its in the middle. Below that is alot of trouble.
Reply With Quote Quick reply to this message
  #8  
Old 11-29-2010, 07:14 PM
Premium Member


 

Join Date: Dec 2008
Location: Aberdeen, WA
Posts: 6,007
Thanks: 8
Thanked 40 Times in 32 Posts
Feedback Score: 9 reviews
might help if you plug in the block heater
Reply With Quote Quick reply to this message
  #9  
Old 11-29-2010, 07:34 PM
Powerstroke Techie

 

Join Date: Oct 2007
Location: Saint Cloud, WI
Posts: 4,455
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
There will be a 2 wire connector connected to the solenoid on the front side of the turbo pedestal on the super duty 7.3. On the obs 7.3 it is on the intake side of the bottom of the turbo.
It will make a huge difference if you plug the block heater in and also change to a lighter weight oil such as 10w-30.
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 07:05 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