Engine Missing when Cold? - 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 10-01-2013, 12:51 PM
Compression Ignition Addict
 

Join Date: Aug 2008
Location: Chatsworth, Ga
Posts: 272
Thanks: 1
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Engine Missing when Cold?

1995 7.3L, Manual Trans. I have had this truck for 2 years, and since I've had it, it has a skip in the engine until it reaches operating temp. Then it's like an injector starts working or something starts working. It runs perfectly after it gets to operating temp. If it sits for 5-6 hours and gets cold, it skips until warm again. I assume it has a bad injector but I don't understand why it would start working when the truck warmed up? I had a local diesel mech turn each injector off and the engine ran like crap each time he turned one off, but the truck was warm and running right at the time. Just looking for some good input here guys. Thanks.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 10-01-2013, 03:34 PM
Compression Ignition Addict
 

Join Date: Aug 2008
Location: Madison, WI
Posts: 3,146
Thanks: 3
Thanked 75 Times in 72 Posts
Feedback Score: 0 reviews
If the skip/miss does not sound/feel the same as when the mechanic intentionally disabled an injector, that's probably not the issue. More likely it's the PCM not "realizing" the engine is cold. Did the mechanic put the truck on a scanner and check any real-time data from any of the sensors? Of the top of my head, I'd say the thing to look for is EOT - engine oil temp, but look at it while the engine is cold.

You're not hearing an additional "whoosssshhh" sound while this is happening, are you?
Reply With Quote Quick reply to this message
  #3  
Old 10-02-2013, 05:51 AM
Compression Ignition Addict
 

Join Date: Aug 2008
Location: Chatsworth, Ga
Posts: 272
Thanks: 1
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
like the EBPV being closed? No, I'm not hearing any sounds like that. He didn't check any real time data as far as I know. I was just over there talking to him and he plugged it up real quick and checked the injectors. So the PCM could be causing it to run like that when not at operating temp?
Reply With Quote Quick reply to this message
  #4  
Old 10-02-2013, 06:00 AM
Compression Ignition Addict
 

Join Date: Aug 2008
Location: Madison, WI
Posts: 3,146
Thanks: 3
Thanked 75 Times in 72 Posts
Feedback Score: 0 reviews
Not the PCM itself (although that's possible), but one of the sensors giving a bad reading.
Reply With Quote Quick reply to this message
  #5  
Old 10-02-2013, 06:03 AM
Compression Ignition Addict
 

Join Date: Aug 2008
Location: Chatsworth, Ga
Posts: 272
Thanks: 1
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
I could probably just take it to Ford and have them do some in depth testing on it.. I just don't want to spend a bunch of money on tests and have them tell me they're stumped.
Reply With Quote Quick reply to this message
  #6  
Old 10-02-2013, 06:09 AM
Compression Ignition Addict
 

Join Date: Aug 2008
Location: Madison, WI
Posts: 3,146
Thanks: 3
Thanked 75 Times in 72 Posts
Feedback Score: 0 reviews
If your local mechanic has a scanner or software that will communicate with our trucks, he could do the same, for prob. a lot less than the dealer. Or maybe there's a member on this or one of the other forums who's nearby you, and could hook it up and take a look.
Reply With Quote Quick reply to this message
  #7  
Old 10-02-2013, 06:14 AM
Compression Ignition Addict
 

Join Date: Aug 2008
Location: Chatsworth, Ga
Posts: 272
Thanks: 1
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
yeah maybe. I just have a really hard time trusting any local mechanic, and even a dealer to work on any diesel vehicle. I haven't had good luck in the past with them.
Reply With Quote Quick reply to this message
  #8  
Old 10-02-2013, 06:21 AM
Compression Ignition Addict
 

Join Date: Aug 2008
Location: Madison, WI
Posts: 3,146
Thanks: 3
Thanked 75 Times in 72 Posts
Feedback Score: 0 reviews
Well, you can get Autoenginuity and an old beater laptop, or an Aeroforce Intercepter, and hook it up yourself. If you're primarily DIY, just consider it another tool.
Reply With Quote Quick reply to this message
  #9  
Old 10-15-2013, 09:19 AM
Powerstroke.org Rookie
 

Join Date: Apr 2007
Posts: 19
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
I have a 96 F350 that does the same thing. Thought it was a dead injector (did the unplugging of each injector while running) so I got another one. Changed it out but still get the same thing...rough/missing idle and the sort until it's warm. Once there, it's perfect and purrs like a kitten. new injector seems to make no difference as it too will make no engine change when unplugged. Also changed the UVCH and gasket.
Reply With Quote Quick reply to this message
  #10  
Old 10-15-2013, 12:18 PM
Compression Ignition Addict
 

Join Date: Aug 2008
Location: Chatsworth, Ga
Posts: 272
Thanks: 1
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Yeah, mine is still doing it after the Ford dealership cleaned the fuel system. (something that dude thought would certainly fix it). If it's not an injector I wonder what it is...
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:
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 08:50 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