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Compression test

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Old 06-11-2007, 11:43 PM
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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
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Old 06-11-2007, 11:52 PM
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mattdel
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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
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Old 06-12-2007, 01:07 AM
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Foxbodyforever
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Default RE: Compression test
lol sorry how exactly do you disconnect the fuel pump relay?
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Old 06-12-2007, 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.
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Old 06-12-2007, 03:44 AM
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tom29
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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?
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Old 06-12-2007, 03:49 AM
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mattdel
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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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