1997 - 2003 F-150

01 f150 4.6 flat spot at 2000 rpm

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Old Mar 23, 2012 | 02:03 PM
  #16  
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Originally Posted by glc
What brand are the plugs?

Bosch
 
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Old Mar 23, 2012 | 02:21 PM
  #17  
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Get them out of there and put some Motorcrafts (not Autolite or any other brand) in. Bosch plugs don't work worth a crap in Ford modular V8's. Aftermarket parts are okay for some things, but not spark plugs in these engines.
 
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Old Mar 24, 2012 | 12:30 PM
  #18  
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Originally Posted by glc
Get them out of there and put some Motorcrafts (not Autolite or any other brand) in. Bosch plugs don't work worth a crap in Ford modular V8's. Aftermarket parts are okay for some things, but not spark plugs in these engines.

Ouch that's gonna hurt Motorcrafts are pricey $64.00 for plugs I hope that will smooth out my Idle.
 
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Old Mar 24, 2012 | 01:02 PM
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Motorcraft SP493's are $2.48 each at rockauto.com.
 
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Old Mar 24, 2012 | 04:51 PM
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Oh well thats not bad at all.
 
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Old Mar 25, 2012 | 12:39 AM
  #21  
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And no the 80-140 would not feel any different.
 
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Old Mar 25, 2012 | 12:45 AM
  #22  
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You can change plugs if you want, but they, 'the plugs', are never a cause of a flat spot in acceleration, no matter what plugs they are.
Only time plugs themselves would be an issue is during cruise at light near costant throttle opening with the EGR function being operated by the PCM.
Under these conditions plug tip errosion can make the plugs harder to fire during the EGR lean conditions.
The EGR usually operates well below 2000 rpm in OD under light throttle loading..
Actually, new plugs last about 600 miles until the electrodes begin to round off and the required plug voltage begins to rise slowly over time.
 
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Old Apr 9, 2012 | 06:50 PM
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I am starting to suspect the mass air flow? maybe, I cleaned it with mass air flow cleaner a while back (1 month ago), I didnt take it apart cuz at the time I did not have a star security bit (I do now) I just sprayed off the little sensors, could I have screwed something up? thanks for the help by the way!! I also have a pretty decent actron scanner witch is pretty nice and easy to use, it gives no codes but some of the internal tests fail $10.......? not sure what that means lol.
 

Last edited by jammad1; Apr 9, 2012 at 06:54 PM. Reason: had to add
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Old Apr 9, 2012 | 06:51 PM
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Also change the fuel filter, it was pretty dirty but didn't make much of a difference.
 
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