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03 mountaineer severe misfiring

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  #1  
Old 03-30-2013, 10:31 PM
robpul123's Avatar
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Default 03 mountaineer severe misfiring

4.6l v8 ....165,Xxx miles 8 new coils 8 new spark plugs not cats no o2 sensors runs horrible takes like 5 seconds to get from 1,000 rpm to 5 ,000...it back fires n misses alot
Once it hits 4000/5000. Rpm it goes fast....i need help
 
  #2  
Old 03-31-2013, 02:42 AM
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Did you just fill up with gas before this started?
If you can't get a fuel filter , you could remove the old one and dump out what is inside and see what comes out, water, dirt ? Empty it in the opposite direction of the arrow , or the way fuel normally goes through it. Look for water or dirt.
 
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Old 03-31-2013, 08:11 AM
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I changed fuel filter and pump a few hours ago....still the same problem
 
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Old 03-31-2013, 09:44 AM
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Ran compression test 1-98 2-100 3-97 4-100 5-102 6-99 7-91 8-98
 
  #5  
Old 03-31-2013, 11:39 AM
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is it possible to have gotten some wires crossed or developed a vac. leak?
 
  #6  
Old 04-02-2013, 07:55 PM
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With all those issues going on at once there should be a check engine light coming on soon. Get the codes if any presents & if you have a small scanner start by checking your long fuel trim & short fuel trim to get an idea of a vacuum leak.
 
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