99 4.6 engine stumble at load (again)
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Elder User
Joined: Aug 2001
Posts: 942
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From: South Texas
fordtech6600
Can you be more specific on the reflash?
Is it a new program / parameters or just re-installing the original code?
If new, can you give some info I can take to a dealer to start them off?
Thanks
Dialtone
Can you be more specific on the reflash?
Is it a new program / parameters or just re-installing the original code?
If new, can you give some info I can take to a dealer to start them off?
Thanks
Dialtone
New User
Joined: Oct 2007
Posts: 6
Likes: 0
fixed 4.6 99 ford f-150 no more promblems with truck
[QUOTE=slippinout10]i used accel high out put coils on my 4.6 cost was about 140.00 but it worked.stopped all skipping,all lose of pulling power,could not ask for a better truck now. slippinout10
New User
Joined: Nov 2005
Posts: 19
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Well I finally got rid of that 401 code with a new dpfe. I will say no one could find the part because it was listed under egr system differently. I still have the slipping and have decided to change ALL coils just to be sure. I do have 104,000 miles on six of the original eight. I changed two coils and all plugs two years ago and it did help for a little while. I'll be hoping for the same result as slippiout10.
New User
Joined: Nov 2005
Posts: 19
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;HECK YEAH!!!! No more problems. Finally changed all plugs again and all 8 COP's(coils). 500 miles and NO issues at all and it looks like my gas mileage my reach 20mpg. Should at least be 18mpg. I can't believe I was in denial about my COP's. Found one old plug still in place as well but I believe my issue was still bad COP's. I must have been out of it to miss one plug two years ago when I changed them out. Oh well, I am really glad everythng is finally resolved. Maybe she will make it to 200,000 miles. Thanks everyone for the input!!!
New User
Joined: Apr 2008
Posts: 1
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Same problem
It is amazing that I have a 1998 Lincoln continental 4.6l with the same problem with no solution. The dealer tried to diagnose the problem for 4 days. They said that all 8 of the coils were bad. All plugs and COPs have been replaced. Well, to my amazement, I still have the same sputtering between 1500-2500 rpm and it is worse under load. This problem seems to get asked on the net without an answer. If you have any ideas please help.
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New User
Joined: Jul 2015
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I had stumbling 98 expedition when under load ie ac and in drive with brakes on...changed plugs, wires, and coil packs...no joy. Finally found plug wires 2 and 3 reversed...truck ran with plugs reversed but ran rough and stumbled, hope this helps someone.
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