1997 - 2003 F-150

A subtle but disturbing shuttering feeling.

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Old Jun 6, 2010 | 10:50 AM
  #16  
Ice-Cable's Avatar
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From: Hanover, IN
I really have appreciated all the advice, but heres another question. What is a good COP to buy....are the ones on ebay good, I would like to use the best ones, but if the ones on ebay are good and cheap, then I may go that route....
 
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Old Jun 6, 2010 | 01:09 PM
  #17  
_cashel's Avatar
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From: Ocala/Orlando, FL
The ones on Ebay are solid, I'd go for those. $80 for a full set vs $40 for a single at Napa/Advance/Discount/etc.
 
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Old Jun 7, 2010 | 10:32 AM
  #18  
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From: PC, FL
Originally Posted by Ice-Cable
I really have appreciated all the advice, but heres another question. What is a good COP to buy....are the ones on ebay good, I would like to use the best ones, but if the ones on ebay are good and cheap, then I may go that route....
i would replace the plugs first, my truck had similar problems and it was the plugs. MotorCraft only
 
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Old Jun 7, 2010 | 09:55 PM
  #19  
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From: Bear, Delaware
Originally Posted by Bluegrass
Comment: I have proven that a coil with shorted turn will cause a stumble BUT be affected by new plugs "until" the new plugs get some time on them.
Then you are right back to the original problem coil.
New plugs can fool you into thinking the issue is solved.
Reason:
The issue is low coil voltage on one cylinder during the operation of the EGR system .
New plugs make it easier to fire the cylinder until the new plug starts to get erroded.
The plug errosion happen much more quickly then anyone would think.
New plugs have sharp edges on the center electrode as well as the ground strap.
When their edges begin to lose there sharpness, it keeps taking more and more coil voltage to fire the cylinder.
This is why new plugs can cover up a bad coil for a short time.


Dang Bluegrass... I have read many of your replies to others, and I will admit you seem to have much knowledge on our topics, but that was kind and civil. You just got a you're ok award .. ..
 

Last edited by Red02FX4; Jun 7, 2010 at 09:58 PM.
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