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4.6 v-8

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  #1  
Old 05-23-2012 | 01:00 PM
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4.6 v-8
I have a '99 f150 with 170k. Lately when I first start it up it will kinda miss and run rough...changed the spark plugs about 4k ago and there is no SES light. What's my problem? Thanks.
 
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  #2  
Old 05-23-2012 | 01:10 PM
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Did you change the coils? is that a coil pack engine? wires? did you use Motorcraft stuff including plugs? Mod motors are picky about that..
 
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Old 05-23-2012 | 01:31 PM
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Its all stock...always use motorcraft stuff...been several years since I changed the wires
 
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Old 05-23-2012 | 01:34 PM
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What is a coil pack engine?...it has two distributers in front of the engine
 
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Old 05-23-2012 | 01:36 PM
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could be the coils or the wires. Might replace the wires first.. Rock auto sells motorcraft parts discounted..
 
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Old 05-23-2012 | 02:01 PM
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How long since the fuel filter was changed, or the MAF and throttle body cleaned?
 
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Old 05-23-2012 | 02:55 PM
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Had po401 code and cleaned throttle body...code went away...also about 10kto on fuel filter...as I said, no codes
 
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  #8  
Old 05-23-2012 | 08:50 PM
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If you have fairly new Motorcraft plugs, it's probably not that, unless one or more of them are cracked. It happens.

More likely wires or coil pack.

You don't have distributors, they are coil packs.
 
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  #9  
Old 05-24-2012 | 02:39 AM
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With that many miles and possibly those being the factory issued coil packs (thought 99 4.6s had COP, but whatever...), you ought to change those out. I think mine made it to about 145k miles before it had enough.
 
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Old 05-24-2012 | 08:04 AM
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What is "COP"?
 
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  #11  
Old 05-24-2012 | 08:25 AM
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Originally Posted by MadePlayer
What is "COP"?
==> https://www.f150online.com/forums/ge...-glossary.html

 
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  #12  
Old 05-24-2012 | 10:58 AM
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I don't think the 4.6 got COP till sometime in 2000.
 
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  #13  
Old 05-24-2012 | 04:32 PM
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Coil Pack=2 coils 4 wires leading from each one. COP=coil on each plug. there is no distributor on any modular engine.
 
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