Hello
I would try a small squirt of starting fluid into the intake boot and see if it fires. If it fires then it is obvious you have a fuel delivery issue. If it still does not fire check for spark, if it has no spark check for possible chewed wire from rodents is a possibility. Hope this helps you.
Joe Boulay
Automotive Technician & Author
joe@joeboulay.com
www.joeboulay.com

The vehicle will need a full function professional shop grade scan tool capable of reading grams per second and calculated loads in order to detect any bad or margins sensors.

See this link for the sensors.
http://www.freeautomechanic.com/car-engine-sensors.html

Call Honda Dealer to schedule a warranty repair. The vehicle is still under the 3 years and 36,000 miles warranty.

Bleed the cooling system by loosening the bleeder screw on the thermostat housing. Air pockets are trapped and they will not come out without bleeding. Common symptom is erratic temperature due to air in the engine causing incorrect reading at the coolant sensor.

The overheating and leaking head gasket condition may have been caused by one or more conditions; low engine oil, low coolant (or incorrect mixture), poor coolant circulation due to clogged radiator passages, poor coolant circulation due to worn / faulty water pump.

Do a compression test in all 4 cylinders. A same compression readings between the cylinders # 2 and # 3, it is considered a head blown gasket.
Local auto parts stores such as O'Reilly or Autozone have a free loan tool program. Check with them.

See this tool http://www.sears.com/.../p-SPM3278298302P

You likely will have; a faulty distributor pickup coil, faulty ignition coil, or a faulty ignition control module.

You have a faulty ignition coil or ignition control module. Both of these components are located inside the distributor. So first try replacing the coil and if that don't fix it then replace the module. The module and coil costs may be more than what a new distributor would cost which comes with these components already installed. The only details I would like to pass on to you from experience is if you buy a new distributor ass'y rather than replacing one component at a time inside your distributor, I would insist that you buy a new unit rather than a remanufactured unit, as the defect rate is very high right out of the box. Dorman (brand) makes new units at a reman price.

Hello
Around $400 to $500 approximatly for just the pump. You will need to replace the timing belt and balance shaft belt as well. Hopefully you did not get the engine too hot because it would be a waste of time and money on that engine. You should also be aware that you have an interference engine and if it went out of time bent valves can be expected. hope this helps.
Joe Boulay
auto tech& author
joeboulay.com

P0420 = Catalyst system efficiency below threshold (bank 1)

A code P0420 may mean that one or more of the following has happened:

Leaded fuel was used where unleaded was called for
A damaged or failed oxygen sensor (HO2S)
Downstream oxygen sensor (HO2S) wiring damaged or connected improperly
The engine coolant temperature sensor is not working properly
Damaged or leaking exhaust manifold / catalytic converter / muffler / exhaust pipe
Retarded spark timing
The oxygen sensors in front and behind the converter are reporting too similar of readings
Leaking fuel injector or high fuel pressure
Cylinder misfire
Oil contamination