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.

STANG IS HURT

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Old 07-16-2008, 11:55 PM
  #1  
quickfast50
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Default STANG IS HURT

CAN'T FIGURE OUT THE MISFIRE IN MY 89 FOX. ANY SUGGESTIONS?
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Old 07-17-2008, 12:53 AM
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93 LX FiveO
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Default RE: STANG IS HURT

i cant figure out your post, any suggestions?
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Old 07-17-2008, 05:22 AM
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projectresto83
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Default RE: STANG IS HURT

Have you done a tune up?? Fuel filter, plugs and wires, cap and rotor, you know the basics. Try just regapping the plugs you have now. Something that simple can cause a misfire.

When does it do it? What are your mods? Give us more info on what, how, and when it does it and we might be able to help you better.
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Old 07-17-2008, 04:28 PM
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quickfast50
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Default RE: STANG IS HURT

I have a 331 Stroker with Holley upper and lower intakes, Holley heads,E303 cam, 1.6 rockers, 24lb injectors 75mm mass air, 195 feul pump bottom end has been redone as well, 373 gears with a supercharger, MSD coil and distributor butmyMSD is not in right now.Spark plugs have been done over 24's and the gap is .54.Right after I changed my spark plugs I started to get a knock from somewhere up top. It doesn't do it at start up but when I give it a little gas to pull it in the garage. 5spd mind you.Any way it started last week I drove it last week it was fine. Got back in it 20min later andI noticed something wasn't right, it wasmissing and then started pinging soI brought it home and parked it. Thats the story.
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Old 07-17-2008, 05:32 PM
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ckyguy68
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Default RE: STANG IS HURT

Start by checking your timing. Make sure the spout connector didn't fall out or something, its a possibility. But anyway, pull that out when you check your timing, and make sure it is still around 10* or so. Next i would try putting the msd ignition in. You've got a whole lot done to your motor with stock ignition, your supercharger might even be blowing the spark out. Hope that helps
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