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.

Compression test

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Old Jun 11, 2007 | 11:43 PM
  #1  
Foxbodyforever's Avatar
Foxbodyforever
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Default Compression test

I want to do a compression test tomorrow at school, just need to know how to disable the fuel system and if there's anything else i should do beofre testing? thanks
Old Jun 11, 2007 | 11:52 PM
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mattdel
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From: Spfld, MA
Default RE: Compression test

take the coil wire off the coil and ground it somewhere, and disconnect the fuel pump relay, or trip the inertia switch
Old Jun 12, 2007 | 01:07 AM
  #3  
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Foxbodyforever
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Default RE: Compression test

lol sorry how exactly do you disconnect the fuel pump relay?
Old Jun 12, 2007 | 01:14 AM
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Mustangkiler
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Default RE: Compression test

Should just be able to unplug the power to the fuel pump in the trunk on the drivers side might be have to remove a cover over it.Mine has a big red button up top and i just unplug it from below the red button.
Old Jun 12, 2007 | 03:44 AM
  #5  
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Default RE: Compression test

where is the inertia switch? and what would happen if u unplugged coil and didnt ground it, just left it hanging?
Old Jun 12, 2007 | 03:49 AM
  #6  
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mattdel
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From: Spfld, MA
Default RE: Compression test

if you leave the coil wire hanging close enough, the spark can jump to it. if you ground it, a good distance away, it wont.
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