Truck runs terrible only when it rains - 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 09-02-2012, 07:26 PM
Member
 

Join Date: Mar 2009
Location: Texas
Posts: 56
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Truck runs terrible only when it rains

My old 99 runs terrible only when it rains, but it runs great all the time?
Any suggestions? I would appreciate any help out there.Thanks
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 09-02-2012, 08:46 PM
aussie=effie
 

Join Date: Apr 2010
Location: melbourne, australia
Posts: 258
Thanks: 0
Thanked 3 Times in 3 Posts
Feedback Score: 0 reviews
Question RAINS

Maybe get some sealant around your CPS ??
Reply With Quote Quick reply to this message
  #3  
Old 09-03-2012, 05:46 AM
Compression Ignition Addict
 

Join Date: May 2010
Location: Raleigh, NC
Posts: 3,528
Thanks: 7
Thanked 6 Times in 6 Posts
Feedback Score: 0 reviews
Does it still run bad if it's raining but the windshield wipers are off? If it's just with the wipers on change the cps

Sent from my DROID BIONIC against my will
Reply With Quote Quick reply to this message
  #4  
Old 09-03-2012, 06:48 AM
Compression Ignition Addict
 

Join Date: Feb 2009
Location: Nacogdoches, TX
Posts: 11,061
Thanks: 0
Thanked 13 Times in 13 Posts
Feedback Score: 0 reviews
Might have a windshield leaking onto the GEM or PCM.
Reply With Quote Quick reply to this message
  #5  
Old 09-03-2012, 07:26 AM
Compression Ignition Addict
 

Join Date: Jan 2010
Location: unvrhrdofit, SK
Posts: 6,552
Thanks: 0
Thanked 22 Times in 21 Posts
Feedback Score: 0 reviews
...don't drive it in the rain? just kidding.

You are gonna have a bad connection, cracked wire coating or something somewhere that is likely getting water in when it rains. Can you give some more detail? How does it run? Does it do it right from start up sitting in your driveway if it's raining or do you have to drive for a bit and get spray swirling around?

I agree that CPS/CPS wiring could be a likely culprit so I would put a new one in and inspect the wiring. After that, I would start your truck then use a garden hose to SLOWLY AND METHODICALLY pour water over your engine/wiring until the symptom starts, starting at your new CPS. Don't use a spray nozzle or something so the water blasts all over. Don't get excited and hurry. Soak a small portion then wait a minute cause it may take a bit for the water to penetrate. If nothing happens, move on to the next area and so on.

Last edited by JJFLASH; 09-03-2012 at 07:29 AM.
Reply With Quote Quick reply to this message
  #6  
Old 09-03-2012, 09:16 AM
Compression Ignition Addict
 

Join Date: Dec 2007
Posts: 4,891
Thanks: 1
Thanked 90 Times in 85 Posts
Feedback Score: 3 reviews
The rain & CPS issue actually has Nothing to do with water, a wire, or a connection. IF you have this problem it's caused by the wiper motor that's generating something that interferes with the CPS's signal to the PCM. This only happens with certain wiper moters and certain CPSs in certain trucks. It's not Really common but not unheard of

Stumbles when it rains??
Reply With Quote Quick reply to this message
  #7  
Old 09-03-2012, 11:39 AM
Compression Ignition Addict
 

Join Date: Jan 2010
Location: unvrhrdofit, SK
Posts: 6,552
Thanks: 0
Thanked 22 Times in 21 Posts
Feedback Score: 0 reviews
Sorry, I should have said "if it's not the wiper motor issue then..." in my post.
Reply With Quote Quick reply to this message
  #8  
Old 09-03-2012, 11:44 AM
Member
 

Join Date: Mar 2009
Location: Texas
Posts: 56
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
It starts stalling once I drive it down the road. It has died at a red light also. When it is dry without water it run great. I will try it without the wipers on next time it rains when I get going. Thanks guys I appreciate your time & help. Dave
Reply With Quote Quick reply to this message
  #9  
Old 09-03-2012, 11:47 AM
Compression Ignition Addict
 

Join Date: Jan 2010
Location: unvrhrdofit, SK
Posts: 6,552
Thanks: 0
Thanked 22 Times in 21 Posts
Feedback Score: 0 reviews
You can go try it with the wipers right now. If that's the issue water has zero to do with it and will act up.
Reply With Quote Quick reply to this message
  #10  
Old 09-04-2012, 10:04 AM
Compression Ignition Addict
 

Join Date: Apr 2008
Location: Wellington Nevada
Posts: 8,510
Thanks: 1
Thanked 25 Times in 25 Posts
Feedback Score: 5 reviews
Its likely the IDM....check signs of water getting into the box or harness.
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 10:43 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