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


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
  #16  
Old 05-17-2007, 08:49 PM
smits03 smits03 is offline
Junior User
 
Join Date: Jul 2004
Posts: 85
smits03 is starting off with a positive reputation.
I had this similar problem with my 97 F-150 4.6 L, it ended up being a plug that was going bad. The SES light never came on, finally after it did they were able to diagnose the problem.
__________________
99 F-150 Super Cab Short Box 4X4 Offroad, 5.4 L, 3.73
Reply With Quote
  #17  
Old 05-26-2007, 08:51 AM
jsmallwood_2000 jsmallwood_2000 is offline
Freshman User
 
Join Date: May 2006
Posts: 42
jsmallwood_2000 is starting off with a positive reputation.
COPs is your answer. I went through all of the same issues, changed this and that, cleaned this and that, over thought many of my symptoms trying to avoid the cops and plugs. Finally changed them out and it runs great now. You can pick them up on ebay for about $20 a piece versus 90 at Ford.
Reply With Quote
  #18  
Old 06-01-2007, 08:33 AM
204017782 204017782 is offline
New User
 
Join Date: May 2007
Posts: 8
204017782 is starting off with a positive reputation.
I am sure you can check the COP's via resistance, but being that this problem was intermittent I opted for the trial and error method. I broke down and bought one COP. I installed it on the #1 cylinder then took a test ride. This didn't fix the problem. Replaced the #2 COP with the original #1, again did not fix the problem. Did the same thing for #3. Due to accessibility, I jumped over to #6 and bam, the hesitation went away. I could not believe it only took four tries. I drove into work today without the aggravation of surging, bucking etc. Now that the truck runs 99.9% better but I can feel a slight skipping at idle and it seems that I do not have 100% power on top end. Could be my imagination.

Is it common to replace all of the COP's when one goes bad?fficeffice" />>>

Reply With Quote
  #19  
Old 06-01-2007, 09:14 AM
Krewat's Avatar
Krewat Krewat is offline
Super Moderator
 
Join Date: Jul 2002
Location: Long Island USA
Posts: 34,412
Krewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputation
Common? Yes, when a mechanic talks you into it because they are making money on each COP

Buy another one, and round-robin it again.
__________________
- art k. - Moderator for the Superduty, V10, 6.2L and FE forums
'13 Taurus SHO 3.5L Ecoboost w/Perf Pkg
'01 F250SD SC SB XLT V10 4x4 Volant CAI Hedman headers 5-star custom tunes on SCT X3
'97 Cougar XR7 30th Anniv Edition 4.6L
'74 F250 Highboy FE390 deceased!
I've been wrong before, I'll be wrong again. Just wait and see. ®
Reply With Quote
  #20  
Old 08-01-2007, 04:40 PM
tenn250 tenn250 is offline
New User
 
Join Date: Dec 2004
Posts: 17
tenn250 is starting off with a positive reputation.
Had the same problem....

You've probably heard this diagnosis before, but I don't see it here. I had a miss under a load (showed up as engine warmed) for the last two years. If you search under 'miss under load' my post comes up near yours. I have a 99 F250 with the 5.4 and had a plug blew out at 109,000 miles. I had to have the head heli-coiled, and when I did I had Autolite plugs installed.

Well, I moved to Colorado and a few months after being there it started this miss under a load thing. Check engine light came on, and Auto Zone showed it was a bad EGR valve. Replaced it, no change. In fact, I still get a code from that, but that's another story. Well, two weeks ago I decided I'd had enough of the miss and since it was getting worse was afraid it was about to leave me stranded somewhere. I went to the dealership and bought 8 new Motorcraft plugs. In the process of installing them, I found all of the COP boots in good shape with the exception of the #7 boot. It was cracked at the top.... bad. In fact, the guy who did the work I mentioned earlier had apparently siliconed it instead of replacing it. I guess when I got to the dry-cold climate of CO it was too much, and the silicone separated from the boot, and the arching began....and has persisted 'til now. I changed the plugs, but they weren't the culprit, it was a bad boot. Put on a new one, 15.00 bucks form Advance.....MISS GONE.

Sorry so long, but it's a good chance this is your issue to.
Reply With Quote
  #21  
Old 08-02-2007, 08:20 AM
204017782 204017782 is offline
New User
 
Join Date: May 2007
Posts: 8
204017782 is starting off with a positive reputation.
Issue was resolved - bad COP on #6 cyl. Truck runs great, however the Check Engine Light decided to come back on. Auto Zone says its is poor EGR flow.
Reply With Quote
Old 08-02-2007, 08:20 AM
 
 
 
Reply

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

Tags
46, 46l, ford, hesitate, hesitates, hesitation, hot, http46hesitationunderload, load, v8, warm

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



All times are GMT -5. The time now is 01:14 PM.


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