Glow plug system issue - 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 12-09-2010, 12:49 PM
Powerstroke.org Rookie
 

Join Date: Feb 2009
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Glow plug system issue

Well its been getting cold in texas and my truck has been giving me trouble starting up in the mornings. I have to crank probally 4 5 second intervals before itll start

Today i had time to check it out and i thought i found the problem. My glow plug solenoid wasnt clicking on. So i ran up to napa and replaced it. I also tested all my glow plugs and they checked out fine. But the solenoid still isnt getting power

Now after jacking around with the truck i found that the two red wires coming off the relay never get power ( im assuming they activate the solenoid) Hince my glow plugs not working.

Anyone know what might be the problem?
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 12-14-2010, 10:49 PM
Rangers Lead The Way!
 

Join Date: Nov 2009
Posts: 11,517
Thanks: 0
Thanked 12 Times in 10 Posts
Feedback Score: 2 reviews
seems like a bad connection id trace those wires
Reply With Quote Quick reply to this message
  #3  
Old 12-18-2010, 01:05 PM
Powerstroke.org Rookie
 

Join Date: Dec 2010
Location: Santa Barbara, CA
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
I'm having the exact same problem. I just replaced the solenoid and after the new one was failing the "voltage test" at the GP side of the relay, I checked the wires coming from the pigtail. One of them shows 12.8v whenever the ignition is turned on, the other does not show any measurable voltage when the GP "warm up light" is on on the dash.

Is there a timer control circuit somewhere that controls the operation of this wire getting voltage? According to my service manual (which is *(%$^ difficult to find information in):

"PCM controls relay's operation by sensing engine oil temperature, PCM voltage, and barometric pressure."

Is it possible/likely that one of these sensors is faulty? I'm assuming that if the barometric pressure sensor was faulty then the fuel injection system would be working very poorly, which it is not once warmed up. The only problem I'm really having is cold starting (no GP operation at all)

Thanks.

Last edited by SBSyncro; 12-18-2010 at 01:17 PM.
Reply With Quote Quick reply to this message
  #4  
Old 12-18-2010, 01:10 PM
Rangers Lead The Way!
 

Join Date: Nov 2009
Posts: 11,517
Thanks: 0
Thanked 12 Times in 10 Posts
Feedback Score: 2 reviews
its all in the pcm
Reply With Quote Quick reply to this message
  #5  
Old 12-18-2010, 01:29 PM
Shaking the Bush Boss
 

Join Date: Feb 2007
Location: Salisbury, NC
Posts: 9,740
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
the relay on the right fender feeds 12v to the GPR. Check and make sure the wire is good between there. It should be on the large post closest to the frt. Should be 2 other leads there also, 1 from the battery and 1 to the alternator.

I cant recall if its a fuseable link... 1 or 2 of them are....
Reply With Quote Quick reply to this message
  #6  
Old 12-18-2010, 03:11 PM
Powerstroke.org Rookie
 

Join Date: Dec 2010
Location: Santa Barbara, CA
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Are you talking about the large gauge "feed" wire, or the smaller wire that "activates" the relay?

Here's an update to my situation... Hopefully this doesn't turn into one of those "why you should pay a professional to do it right" kinds of threads....

I started testing voltages and noticed that one of the two small wires to the GPR was getting voltage when the key was turned to the "run" position (when the GPs should be warming up). It wasn't turning off after the light in the dash did, but I'm not sure about whether that light is "smart" or not (or just a dumb timer that isn't actually aware of the GP voltage status).

"Aha" I thought - the PO must have installed the relay with these wires crossed up. So I reversed them (putting on on the "I" terminal and the other on the "S" terminal on the opposite positions that they'd been.

I pulled the terminal plug to the GPs and turned on the key to the "start" position and checked the voltage to the GPs via the terminal connector. Sure enough, I was getting voltage!

So, I plugged the connecter back in, put away the tools and fired up the truck. It started easily, since now the GPs were getting hot.

I ran her around the block to warm up the engine, planning to check to make sure the GP relay had shut off by the time the engine was warmed up.

Well, I got about 1/2 a block down the street and the truck wouldn't shift for a looong time then WHAM! it shifted hard, then shift back. Suddenly the truck is running like CRAP and I notice the "OFF" light on the overdrive button is flashing.

So much for that idea...

I pulled back into the driveway and switched the wires back to their original position and took her back out for another drive around the block. Unfortunately, the problem is still there - shifting VERY rough and running very poorly while flashing the "Overdrive Off" button.

Now I'm wondering if somehow I fried the PCM by swapping the wires....
Reply With Quote Quick reply to this message
  #7  
Old 12-18-2010, 04:01 PM
Powerstroke.org Rookie
 

Join Date: Dec 2010
Location: Santa Barbara, CA
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Update (and good news). Man, I cannot believe the electrical system in this car - I'm starting to wonder if maybe some Brits were involved in the design....

I discovered that I'd blown the fuse for the dome light today while changing out the assembly (Fuse #8). Swapping the 15 amp fuse from the turn signals (#7) fixed the problem. Sheesh, what a relief!

Now, back to the original problem of getting this GP relay to work...
Reply With Quote Quick reply to this message
  #8  
Old 12-18-2010, 04:59 PM
Compression Ignition Addict
 

Join Date: Apr 2007
Posts: 3,366
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Keep in mind that your glow plugs dont always kick on.
Reply With Quote Quick reply to this message
  #9  
Old 12-18-2010, 05:40 PM
Powerstroke.org Rookie
 

Join Date: Dec 2010
Location: Santa Barbara, CA
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Quote:
Originally Posted by Goose View Post
Keep in mind that your glow plugs dont always kick on.
Yup. Apparently the PCM looks at oil temp & air pressure (barometric) to determine how long to fire them.

Anyone know the max time they will run before shutting off? Under which conditions?
Reply With Quote Quick reply to this message
  #10  
Old 12-22-2010, 11:45 AM
Member
 

Join Date: Jun 2008
Location: texas
Posts: 89
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Send a message via AIM to bdpprocessors
Problems again

Ok so i replaced the relay and it worked fine for a few weeks but now im having issues again.

When i turn the key. The wire going to the Plugs never gets Power. The two small red wires are always posotive. (shouldnt one be negative and then switch to posotive so the relay deactivates? ).

So What im thinming is that whatever tells these wires to switch from pos to neg is bad. What controls this?

Or does anyone know of another possible problem It could be?
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 08:18 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