Ford Mustang Forum - View Profile: grn 00 gt
 
4.6L Member

grn 00 gt grn 00 gt is offline

GT Member

  Timeslip Database

Induction
N/A
Tranny type
Manual
Tires
Street Radials
Horsepower
0.0
60 foot time
0.000
1/8 Mile ET
0.000
1/8 Mile MPH
0.00
1/4 Mile ET
0.000
1/4 Mile MPH
0.00

  Profile Comments

Showing Profile Comments 1 to 4 of 4
  1. grn 00 gt
    06-23-2011 - permalink
    grn 00 gt
    coils 1 & 6 fire together, coils 3 & 5 fire together, coils 1 & 7 fire together and coils 2 & 8 fire together

    On the 4.6L during the firing order of 1,3,7,2,6,5,4,8 all 8 spark plugs will fire during 1 engine revolution. The system is really 4 coils with 2 plugs firing on each coil pair, if that makes sense. So you have lost the +12vdc or -12vdc to the 3&5 coil pack. Good luck and I hope that helps.
  2. grn 00 gt
    06-23-2011 - permalink
    grn 00 gt
    Spark plugs 3 & 5 fire at the same time (which is why they call the system "waste" spark) because 2 coils fire at the same time, one is on the power stroke and the other the exhaust stroke which is the wasted spark... here is a picture of the coil assembly and the firing order. Make sure all the grounds and power wires are good. I bet your coil power wire or ground has a break or loose wire which is causing both cylinders not to fire. If one fires, the both will unless the coil has failed internally. Here is the link: http://i293.photobucket.com/albums/m...t/DSC03352.jpg
  3. grn 00 gt
    06-23-2011 - permalink
    grn 00 gt
    Hi Pedro,
    The 96-98 had the waste spark system, so I will have to do a little research and get back to you. Sounds like the only thing that hasn't been checked/changed is the harness from the computer to the engine compartment. Make sure all the grounds are good. How did you narrow it down to cylinders 3 & 5? The more information you can provide, the better.
  4. dkangry2006
    06-22-2011 - permalink
    dkangry2006
    hi...my name is pedro...i have a 96 ford mustang gt...nd the problem im having is that one of the coil is not throwin any spark to 3 nd 5...i have already changed the spark plugs, the spark wires, the coils, the engine hardness nd i even bought a new computer nd i still cant find the problem......i hope u can help me with this problem....thanks.....

  About Me

  • Member Info
    Nick Name
    chip
    Real Name
    Chip
    Location
    Middle
    State or Province
    Tennessee
    Country
    United States
    About Me
    Living on the dark side with a little red 99 corvette.
    Bored 289 waiting in garage for the next project. = )
    Mustang Rides
    1965 Mustang Coupe 289 w/ 3 speed & Factory A/C (sold)
    1967 Mustang Coupe 289 w/ 5 speed (sold)
    1984.5 Mustang GT Turbo 5 speed (sold)
    1989 Mustang LX Sport 5.0 5 speed (sold)
    2000 Mustang GT Supercharged w/6 speed (sold)
  • Timeslip Database
    Induction
    N/A
    Tranny type
    Manual
    Tires
    Street Radials
    Horsepower
    0.0
    60 foot time
    0.000
    1/8 Mile ET
    0.000
    1/8 Mile MPH
    0.00
    1/4 Mile ET
    0.000
    1/4 Mile MPH
    0.00

  Statistics

Profile Comments
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  • Last Activity: 06-21-2014
  • Joined: 09-17-2007
  • Referrals: 0

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