4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

ENGINE PROBLEMS

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Old Jan 15, 2006 | 09:12 PM
  #1  
tony28's Avatar
tony28
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From: ga
Default ENGINE PROBLEMS

Hey, i have a 1999 GT and the check engine keeps coming on. the code is PO306, a misfire on cylinder 6. ive had this problem before and i replaced the spark plugs and it was fine for about a week. now its hesitating and acting up the same way again and giving the same code. what else can i replace. the coils maybe, or ive also heard that the fuel rail may be clogged?
Old Jan 15, 2006 | 09:56 PM
  #2  
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Chopper
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Default RE: ENGINE PROBLEMS

Try changing the injector in the bad cylinder with another and see if the problem follows the injector.If so replace or clean the injector.
Old Jan 16, 2006 | 12:37 AM
  #3  
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Jglisson
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Default RE: ENGINE PROBLEMS

Injectors are rarely a problem. You have a bad coil pack. What are you considering to be cylinder # 6...assuming you are sitting in the driver's seat...
Old Jan 16, 2006 | 01:13 AM
  #4  
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sprostang
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Default RE: ENGINE PROBLEMS


ORIGINAL: tony28

Hey, i have a 1999 GT and the check engine keeps coming on. the code is PO306, a misfire on cylinder 6. ive had this problem before and i replaced the spark plugs and it was fine for about a week. now its hesitating and acting up the same way again and giving the same code. what else can i replace. the coils maybe, or ive also heard that the fuel rail may be clogged?
Sounds like a bad coil. If the fuel rail was clogged, im sure all 4 cylinders on that side would be affected as well. Switch the coil and go from there.
Old Jan 16, 2006 | 01:48 AM
  #5  
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tony28
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From: ga
Default RE: ENGINE PROBLEMS

cylinder 6 would be the third one on the left (from drivers seat). Ok thanx ill try replacing the coil and go from there.
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