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Big time miss....

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Old Mar 6, 2010 | 04:22 PM
  #1  
chuckster48's Avatar
chuckster48
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Big time miss....

I have an '04 S CREW, 5.4 engine, 175,000 miles on it. When accelerating on to the freeway, it seems to have a big time miss between 45, and 70, while accelerating, under load. Acts like a coil is breaking down, or it is shorting out, but it does not store a code. Any thoughts? Plugs were replaced at 90,000.
 
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Old Mar 6, 2010 | 05:42 PM
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the4by4freek
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From: North Carolina
Have you checked to see if a coil has come unplugged? I chased a miss for almost a week in my Expedition when I owned it. I finally made it throw a code by driving it like a race car! It threw the code and I replaced the coil and plug and all was good. Before it threw a misfire code, it threw out several other bogus codes.
 
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Old Mar 8, 2010 | 12:56 PM
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Not sure how well it will work on the F150, but on the V8 SHOs, if you unplug one coil and drive around the block, it will toss teh codes for the one you unplugged and any other weak one.
 
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Old Mar 8, 2010 | 06:52 PM
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Will try that. Nothing else seems to work.
 
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Old Mar 8, 2010 | 08:14 PM
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1bad67sbf
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From: northern va
i have a 2007 f150 and my #5 cylinder was throwing a missfire code. it only missed under wot and a plug change fixed it. it only had 40k on it
 
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