Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Modular V8 (4.6L, 5.4L)
Sign in using an external account
Register Forgot Password?


Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 08-22-2010, 05:18 PM
diver doug diver doug is offline
New User
 
Join Date: Aug 2010
Posts: 3
diver doug is starting off with a positive reputation.
Flickering Check Engine Light, Loss of Power 1997 F150 5.4L

Recently the Check Engine light would come on for a day or two and go out. Today it began flickering (later stayed on solid) and it had a loss of power and began running rough. The engine has 310,000 miles. What could this be.

Diver Doug
Reply With Quote
  #2  
Old 08-22-2010, 08:11 PM
Moto Mel's Avatar
Moto Mel Moto Mel is offline
Postmaster
 
Join Date: Jan 2009
Location: Chesapeake, Va.
Posts: 4,574
Moto Mel has a great reputation on FTE.Moto Mel has a great reputation on FTE.Moto Mel has a great reputation on FTE.Moto Mel has a great reputation on FTE.Moto Mel has a great reputation on FTE.
Quote:
Originally Posted by diver doug View Post
Recently the Check Engine light would come on for a day or two and go out. Today it began flickering (later stayed on solid) and it had a loss of power and began running rough. The engine has 310,000 miles. What could this be.

Diver Doug

At 310,000 miles it's probably telling you that it's tired and it's time for a rebuild. How is the oil pressure gage reading? Is it in the middle and steady or low and sometimes fluctuating rapidly? In the middle can still be low oil pressure as the gage will read "normal" at 7 psi and over.
Reply With Quote
  #3  
Old 08-23-2010, 10:34 AM
diver doug diver doug is offline
New User
 
Join Date: Aug 2010
Posts: 3
diver doug is starting off with a positive reputation.
Thanks for the response. Oil pressure is good, always steady. The gauge reads a bit above the middle. When the milage was just about 200K I replaced the heads (pin hole leak had developed leaking out coolant). That was about 4 years ago. The truck has run great ever since then until now. Now I am thinking maybe the spark plugs. Does a check engine light occur when plugs start to mis fire? Or could this be a coil problem?
Reply With Quote
  #4  
Old 08-23-2010, 11:12 AM
Moto Mel's Avatar
Moto Mel Moto Mel is offline
Postmaster
 
Join Date: Jan 2009
Location: Chesapeake, Va.
Posts: 4,574
Moto Mel has a great reputation on FTE.Moto Mel has a great reputation on FTE.Moto Mel has a great reputation on FTE.Moto Mel has a great reputation on FTE.Moto Mel has a great reputation on FTE.
[quote=diver doug;9249373]Thanks for the response. Oil pressure is good, always steady. The gauge reads a bit above the middle. When the milage was just about 200K I replaced the heads (pin hole leak had developed leaking out coolant). That was about 4 years ago. The truck has run great ever since then until now. Now I am thinking maybe the spark plugs. Does a check engine light occur when plugs start to mis fire? Or could this be a coil problem?[/quote]


It could be either and it will usually cause the CEL to come on and set a code.
Reply With Quote
  #5  
Old 08-24-2010, 07:46 PM
iwmoose iwmoose is offline
New User
 
Join Date: Apr 2005
Posts: 9
iwmoose is starting off with a positive reputation.
I had the same thing happen to me and it was a spark plug problem.
Reply With Quote
  #6  
Old 08-25-2010, 08:44 AM
projectSHO89 projectSHO89 is offline
Post Fiend
 
Join Date: Jan 2004
Location: St Louis
Posts: 9,374
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 ofprojectSHO89 has much to be proud of
It is a misfire. Pull your fault codes so you know where to look. Most common failure is a COP.
__________________
2001 F250 SD V10 4x4
HVAC FAQs: http://www.ford-trucks.com/forums/75...xpedition.html
Owner's manuals: http://www.fleet.ford.com/maintenance/owner-manuals/
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
  #7  
Old 08-30-2010, 06:03 PM
diver doug diver doug is offline
New User
 
Join Date: Aug 2010
Posts: 3
diver doug is starting off with a positive reputation.
Thank you. I did realize the plugs had about 113K on them so I changed the plugs. For a few days the Check Engine light was off but the truck still had some hesitation and misfiring. After three days when passing on a hill the cutting out came back and the check engine light came backon, flashing. It flased for about 20 minutes and then stayed on continously. A few hours later the light is out. If this is a coil problem wouldn't I have continous sputuring and the light on?
Reply With Quote
  #8  
Old 08-30-2010, 08:55 PM
projectSHO89 projectSHO89 is offline
Post Fiend
 
Join Date: Jan 2004
Location: St Louis
Posts: 9,374
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 ofprojectSHO89 has much to be proud of
READ THE CODES! DO NOT GUESS.
__________________
2001 F250 SD V10 4x4
HVAC FAQs: http://www.ford-trucks.com/forums/75...xpedition.html
Owner's manuals: http://www.fleet.ford.com/maintenance/owner-manuals/
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
Old 08-30-2010, 08:55 PM
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
What side A pillar do roof lights run up? MONAVIERONJON 1987 - 1996 F150 & Larger F-Series Trucks 6 09-24-2013 09:08 PM
Ecoboost/truck camper diver110 2009 - 2014 F150 6 10-13-2011 06:17 PM
please welcome our newest member diver45 jr32560 Maryland Chapter 7 01-07-2010 06:19 PM
drivers side headlight problem panteramatt Explorer, Sport Trac, Mountaineer & Aviator 2 03-22-2008 04:14 PM
02 Explorer Sport Trac - Computer Codes johnsdw Explorer, Sport Trac, Mountaineer & Aviator 2 01-24-2008 12:04 PM


Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Modular V8 (4.6L, 5.4L)

Tags
1997, cel, check, engine, f150, flashing, flicker, flickers, ford, light, loss, misfire, oil, power, pressure, solid, sudden

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


Participate In The Forums

Create new posts and participate in discussions. It's free!

Sign Up »





All times are GMT -5. The time now is 07:48 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. Ford® is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup