5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

Miss

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Old 12-21-2007, 11:13 PM
  #1  
redtxlx
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Default Miss

few days ago, i installed a new msd distributor, along with motorcraft wires, an msd coil and bosch platinum +2 plugs on my 90 5.0. now ive got a miss, i can feel it. ive cecked all the plugs and wires and made sure everything is tight and in the correct places, firing order is correct. i have absolutely no idea what it is though. ive heard that the +2 plugs require too much power for the stock ignition system, but if i replaced the coil shouldnt that fix that problem? thnx for the help.

Brian
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Old 12-21-2007, 11:17 PM
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mjr46
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Default RE: Miss

get those crap ace bosch platnuim plugs outta there and put a set of copper resistor core autolite 25's I believe they are in...that's to say you are sure the plug wires are in correct order and plug gap wasn't mashed if a plug was dropped........also was the miss there before the tune up or after???
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Old 12-21-2007, 11:23 PM
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redtxlx
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Default RE: Miss

only after. im fairly certain everything is in the right place. maybe ill try new plugs, if i can return those......[:@]
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Old 12-22-2007, 04:27 AM
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PRO50SC
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Default RE: Miss

ORIGINAL: mjr46

get those crap ace bosch platnuim plugs outta there and put a set of copper resistor core autolite 25's I believe they are in...that's to say you are sure the plug wires are in correct order and plug gap wasn't mashed if a plug was dropped........also was the miss there before the tune up or after???
Not only that, but you shoulda left the stock distributor in there. MSD's are garbage!!
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Old 12-22-2007, 04:31 AM
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86 5.0L
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Default RE: Miss

yes the Bosch plugs cause missfires in 5.0s
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