Which fuse to pull when changing cap and rotor

[98civex]

On 96-00 civics I've read if you don't pull a fuse (ignition or ecu?) that when you flick key to turn rotor so you can get to the screw it can kill the coil. So which fuse is it? Thanks

 

[RonJ]

What year Civic?

For 96-00 Civics, you can unplug the distributor connector or remove 15A hood fuse 44. For 98-00 Civics, you could also remove dash fuse 9.

 

[98civex]

98 and 99 (friend's) so remove both ECU (fuse 44) and ignition (fuse 9) fuses? Ok thanks

 

[RonJ]

Either one

 

[98civex]

Either one

Oh ok thought I had to remove both.

Could you explain why leaving them in risks damage to the coil? Is it because the built up field can't collapse (not grounded)?

 

[RonJ]

Could you explain why leaving them in risks damage to the coil? Is it because the built up field can't collapse (not grounded)?

Correct. After removing the cap, you usually need to flick the ignition switch to the Start position in order to position the rotor screw for removal. With the cap off, the high voltage in the coil has nowhere safe to go when the ICM tells it to release spark. This is a very good way to blow the coil. Removing one of those fuses either blocks voltage from reaching the distributor (fuse 9) or blocks the ECU switch signal to the ICM (fuse 44).

 

[Hecz]

Correct. After removing the cap, you usually need to flick the ignition switch to the Start position in order to position the rotor screw for removal. With the cap off, the high voltage in the coil has nowhere safe to go when the ICM tells it to release spark. This is a very good way to blow the coil. Removing one of those fuses either blocks voltage from reaching the distributor (fuse 9) or blocks the ECU switch signal to the ICM (fuse 44).

I did not know this, Great info to know!

 

[98civex]

Correct. After removing the cap, you usually need to flick the ignition switch to the Start position in order to position the rotor screw for removal. With the cap off, the high voltage in the coil has nowhere safe to go when the ICM tells it to release spark. This is a very good way to blow the coil. Removing one of those fuses either blocks voltage from reaching the distributor (fuse 9) or blocks the ECU switch signal to the ICM (fuse 44).

Awesome. Thanks a lot

 

[mymmeryloss]

Ive never pulled a fuse to change the rotor lol. Good to know!

 

[kngky1002]

Hi guys. I'm new to this forum. I have a 98 Civic EX Coupe. My car wouldn't start two days ago and I bought a cap and rotor set to replace the old one. I was able to replace the cap easy but the screw on the rotor just would not come out.The screw head has already been stripped a little because of me but i think there is still enough left to try to get it off but I dont want to keep trying in case I strip the head completely. Does anyone have any suggestions on how I can get this screw off so I can replace my rotor as well? Thanks!

Edit: The car starts now after I've changed the cap but I still need to change the rotor because the tips of the metal are corroding.

 

[RonJ]

Hi guys. I'm new to this forum. I have a 98 Civic EX Coupe. My car wouldn't start two days ago and I bought a cap and rotor set to replace the old one. I was able to replace the cap easy but the screw on the rotor just would not come out.The screw head has already been stripped a little because of me but i think there is still enough left to try to get it off but I dont want to keep trying in case I strip the head completely. Does anyone have any suggestions on how I can get this screw off so I can replace my rotor as well? Thanks!

Edit: The car starts now after I've changed the cap but I still need to change the rotor because the tips of the metal are corroding.

Buy a bolt-remover socket set or drill the screw out.

 

[98civex]

I have a question about removing the rotor, in the past I remember even after the screw was off it just would not budge off the shaft, any tips if I run into that again?

 

[RonJ]

I have a question about removing the rotor, in the past I remember even after the screw was off it just would not budge off the shaft, any tips if I run into that again?

Cut it off with a Dremel tool. (after you remove the distributor from the car)