96 honda civic only has 1 sparkplug firing

I would have it tested with a gas meter to see if the head gasket is leaking, I bet it is.

I don't see any mention of having the cooling system flushed or the water pump being serviced. Both could be creating your problem. Also are you sure the new head gasket was installed properly, the right one and not upside down.

After so many over heats.a car sometimes cant handle.
after constant over heating your cars rubber gaskets could have gone bad and turned brittle letting in oil into spark plug well #1
for your spark plug problem i would recommend changing your valve cover gaskets.
and for the over heating and not turning on.
i believe you blew a head gasket.

Did the timing belt break? Are you 100% that it is "in time" correctly? Does it spin over effortlessly? If so,do a compression check,and make sure you dont have any bent/broken valves,or blown head gasket.

The TDC sensor (aka camshaft position sensor) is located under the same cover as the timing belt. Incidently, the water pump is also driven by the timing belt. The process for replacement of the TDC is not difficult, just involved. Here is a link that I hope you will find helpful; It gives step-by-step instructions with photos on how to change the TDC. This is for a civic, but the setup for the CR-V is essentially the same. If you have high mileage, you will also want to check the condition of the timing belt and water pump while you have everything apart. If you decide to replace the other parts as well, you will need the associated gaskets, timing belt, water pump and belt tensioner. http://www.civicforums.com/forums/7-honda-civic-diys-civic-tech-chat/323984-diy-tdc-sensor-cmp-sensor-replacement-w-pics.html?8caa1db9f40a1e09f200d7c940d8cc64
If your computer will not let you click on the link directly, you can copy and paste it to your address bar.

Good luck and God Bless.

The coolant that you are adding fills up to the top of radiator, then slowly drains down through engine block and water pump, You will have to fill radiator completely about 2 times for it to stay full for good.

did you put the belt back on the camshaft correctly while removing the head off the block changing the head gasket? if you dint than timing is off... STOP everything and check make sure you put everything back in timing... if you did you may have to rotate dizzie back and forth to catch the correct timing while turning your engine, "Caution" all hondas' engine is interference engine which mean if you put the timing incorrect position you will damage your valves. its very important that you put the timing back in the correct position, if not you will damage your head and valves.

first make shure the fireing order is correct 1 3 4 2, make shure you have the timeing set right

check your oil make sure the crank seal is ok that u didnt spill ur oil and blow it up. then check the timing belt - you may not have had the tension tight enough on the timing belt and it may have skipped a bit causing it to not fire. i think thats the most likely.

It is either a blown head gasket or a cracked head. Depending on which motor your civic has, this could be a tricky replacement, either way, you have to remove the head off of the motor, and then take the head to have it pressure checked to see if there is a crack in it. Nine times out of ten though, you can see a crack in the head with your eye, but you have to have the right "eye" to be able to see the crack.