I just have a couple questions on what fuses/connectors i need to pull for a compression test. Should I just pull the 15amp fuse under the hood for the fuel pump relay? What about the ingition coil?

 

you should be fine just pulling the fuse for the fuel

 

Well that's what I thought but i had heard from some members as well as my auto teacher that you should also pull a fuse for the ignition so that you don't burn up the coil. Without anywhere for the electricity to ground out it will overheat your coil.

 

I don't know about overheating, but the spark has to go somewhere. Without plugs to provide a ground path, the high voltage could break down through the coil to ground. Not a good situation.

Pull the fuse to be safe. Can't hurt.

 

Which one should I pull? The 50 amp under hood fuse? Or will that not even allow me to crank the car? If not that one then which. Thanks for the help.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CivicSiDriver02 &raquo;</TD></TR><TR><TD CLASS="quote">Well that's what I thought but i had heard from some members as well as my auto teacher that you should also pull a fuse for the ignition so that you don't burn up the coil. Without anywhere for the electricity to ground out it will overheat your coil.</TD></TR></TABLE>

your teacher is correct.. you dont want to burn out the coil..
pull out the ecu main fuse

 

Thank you.