Go Back   Ford Truck Enthusiasts Forums > Newer Light Duty Trucks > 1997 - 2003 F150
Sign in using an external account
Register Forgot Password?


1997 - 2003 F150 1997-2003 F150, 1997-1999 F250LD, 7700 & 2004 F150 Heritage SPONSORED BY:

Welcome to Ford-Trucks Forums!
Welcome to Ford-Trucks.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Ford-Trucks Forums community today!





 
Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 05-08-2013, 09:39 PM
cgouldy cgouldy is offline
Freshman User
 
Join Date: Apr 2013
Posts: 32
cgouldy is starting off with a positive reputation.
Missfire Help???

Ok i've been getting a intermitent missfire on my truck for soem time now. It ran great all winter but now its getting hotter it intermitently misses

Last summer I replaced all the coils. And the coil inquestion now was replaced since last summer with Motor Craft Coil.

I have red the check Engine Codes a d here is the freeze Fram data

DTC :P0351
Fuel System I : Closed Loop
Calculated Load: 71.37%
Engine Coolent temp: 199.4 F
Short Term Fuel Trim Bank 1 : 3.91%
Long Term Fuel Trim Bank 1: 0.78%
Short term Fuel Trim Bank 2: 6.25%
Long Term Fuel Trim Bank 2: 0.78%
Engine RPM :1613.25
Vehicle Speed Sensor: 4.35 MPH

Any Idea what might be my problem? Since The Short Tem Fuel trim from bank 1 and Bank two are vastly different could that mean my fuel injector is not working correctly?

Can anyone give me some suggestions please.
Reply With Quote
  #2  
Old 05-09-2013, 05:10 AM
projectSHO89 projectSHO89 is offline
Post Fiend
 
Join Date: Jan 2004
Location: St Louis
Posts: 9,046
projectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud of
You have an electrical problem with the primary side of the #1 coil. It might be an intermittent connector (clip missing?), a wire harness problem, or a PCM problem.

Inspect the connector carefully first.
__________________
2001 F250 SD V10 4x4
HVAC FAQs: http://www.ford-trucks.com/forums/75...xpedition.html
Owner's manuals: www.motorcraftservice.com
“It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt.” - Mark Twain
Reply With Quote
  #3  
Old 05-09-2013, 07:53 AM
cgouldy cgouldy is offline
Freshman User
 
Join Date: Apr 2013
Posts: 32
cgouldy is starting off with a positive reputation.
Well the connector was replaced last summer when all this started. The one noticible thing is it happens when the outside temp is 85 degrees or above. I was going to replace the wireing harness but Ford no longer makes the Harness for this year model of truck and I can't seem to find one anywhere.

I've been told by Ford Tech he doesn't think it is the PCM. Cause if it was it wouldn't be intermittent.
Reply With Quote
  #4  
Old 05-09-2013, 10:11 AM
cgouldy cgouldy is offline
Freshman User
 
Join Date: Apr 2013
Posts: 32
cgouldy is starting off with a positive reputation.
If when the COP connector was replaced if it was spliced in backwards could that cause a intermitent missfire?

Only thing that has been consistant with the missfire is it only happens when its above 85 degrees outside temp.
Reply With Quote
  #5  
Old 05-09-2013, 11:16 AM
projectSHO89 projectSHO89 is offline
Post Fiend
 
Join Date: Jan 2004
Location: St Louis
Posts: 9,046
projectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud of
...just because something was repaired last year doesn't mean it's still repaired today.
__________________
2001 F250 SD V10 4x4
HVAC FAQs: http://www.ford-trucks.com/forums/75...xpedition.html
Owner's manuals: www.motorcraftservice.com
“It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt.” - Mark Twain
Reply With Quote
  #6  
Old 05-09-2013, 12:15 PM
cgouldy cgouldy is offline
Freshman User
 
Join Date: Apr 2013
Posts: 32
cgouldy is starting off with a positive reputation.
That is true. But I have put 3 or 4 new coils on this one cylender last summer with in about 3 months. I first used aftermarket coils and kept replacing cause I was told that was what was wrong. I finally spent the money on a Motor Craft coil last summer. And it still missfired. Guess my next step is to buy one directly from ford and see if it corrects it.
Reply With Quote
  #7  
Old 05-09-2013, 06:02 PM
cgouldy cgouldy is offline
Freshman User
 
Join Date: Apr 2013
Posts: 32
cgouldy is starting off with a positive reputation.
Today I used a test light to test the COP Connector before it began to missfire. When I did the light would strobe off and on. After it started to missfire today I checked the connector with test light and now the light would just be solid. It wasn't strobing like before.
Reply With Quote
  #8  
Old 05-09-2013, 06:47 PM
projectSHO89 projectSHO89 is offline
Post Fiend
 
Join Date: Jan 2004
Location: St Louis
Posts: 9,046
projectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud of
That means it isn't receiving its "grounding" pulses from the PCM which means there is either an intermittent open circuit in the wiring harness or the PCM is bad.
__________________
2001 F250 SD V10 4x4
HVAC FAQs: http://www.ford-trucks.com/forums/75...xpedition.html
Owner's manuals: www.motorcraftservice.com
“It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt.” - Mark Twain
Reply With Quote
  #9  
Old 05-09-2013, 07:23 PM
cgouldy cgouldy is offline
Freshman User
 
Join Date: Apr 2013
Posts: 32
cgouldy is starting off with a positive reputation.
How would I find where the open circuit in the wireing harness is?

And second question is Would having the ford service department re Flash the computer help?
Reply With Quote
  #10  
Old 05-09-2013, 07:28 PM
cgouldy cgouldy is offline
Freshman User
 
Join Date: Apr 2013
Posts: 32
cgouldy is starting off with a positive reputation.
I aslo ran some tests from my Scanner It gave me these Codes
P1000 OBD systems Readyness test not complete
P0703 Brake switch B Imput Circuit
Reply With Quote
  #11  
Old 05-09-2013, 08:56 PM
Bluegrass 7 Bluegrass 7 is offline
Postmaster
 
Join Date: Sep 2006
Posts: 4,863
Bluegrass 7 has a good reputation on FTE.Bluegrass 7 has a good reputation on FTE.
Since you saw a solid ground on that coil lead from the PCM, you need to chase back the harness to the PCM connector to be sure there is not a rub-through to ground.
At the PCM Pin input for that cylinder, there is a solidstate switch in the PCM that supplies ground to the coil when it's time in the fire order to do so.
Only thing left to do when the trouble is in is to meter that pin for a ground to know it's the PCM Switch.
Normally it should measure about 10,000 ohms referenced to ground not much more or not much less. This resistance is built into the design so testing can confirm it.
Unless you go this far to prove out the trouble you will only be guessing when replacing the PCM for it's total cost and possibly not solve the missfire.
At a dealer shop, they should have what's known as a breakout box to connect between the harness and the PCM to make this test and know for sure if the PCM switch is faulty.
Good luck..
Reply With Quote
  #12  
Old 05-09-2013, 10:27 PM
cgouldy cgouldy is offline
Freshman User
 
Join Date: Apr 2013
Posts: 32
cgouldy is starting off with a positive reputation.
Will do that tomorrow or saturday. I'm hoping its not the PCM. Will post and let you know what I find.
Reply With Quote
Old 05-09-2013, 10:27 PM
 
 
 
Reply

Go Back   Ford Truck Enthusiasts Forums > Newer Light Duty Trucks > 1997 - 2003 F150

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
2004 Lincoln Navigator - 5.4 Intech - P2197 O2 Sensor Signal Biased/Stuck Lean (Bank 2 Sensor 1) Kid Clean Expedition & Navigator 4 09-08-2014 02:52 PM
o2 sensor problems, need help! gopher2 1987 - 1996 F150 & Larger F-Series Trucks 4 06-01-2014 09:11 AM
Strange Fuel Trim Values jshine Ranger & B-Series 3 03-11-2014 09:24 AM
1996 F150 Hard start when hot keyul 1987 - 1996 F150 & Larger F-Series Trucks 2 04-16-2013 12:26 AM
Using a Scanner to uncover problems not yet showing by Code or CEL.. Bluegrass 7 1997 - 2003 F150 12 03-22-2013 02:09 PM



All times are GMT -5. The time now is 07:47 AM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Fordฎ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup