Failed emissions hc high

get your injectors cleaned. change the air filter .change your plugs. put a fuel cleaner in your fuel tank.

Use Google & study Vehicle Exhaust Emission
You'll be there for weeks,if you even understand it all
Could type in: High HC Exhaust Emissions or vehicle
hydro carbon problems
When a vehicle gets that old your close to mechanical
issues that aren't worth fixing

run the fault codes to find the faulty sensor
sensors that control the exhaust emissions are the HO2S ( heated oxygen sensors in the exhaust manifold/s
the O2 sensor ( oxygen sensors after the cat converters ) and the EGR unit that recycles exhaust gas back through the engine to re-burn the gasses

hi.
there are any number of things that could cause this, most of which need a computer diagnostic test to find and remedy.

the most common cause is also the simplest and cheapest to fix.
a dirty air filter will cause HC and NO readings to be high.
change the air filter, even if it looks clean. it is a cheap part and easy to install.
unless you have changed the filter in the last couple of months, do this first and take the car on a 40-50 mile run to clear the engine. then have the emissions checked again.

if this doesn't work then you will probably need a computer diagnostic test to identify the problem area.

hope this helps

HC is hydrocarbons or unburnt fuel.(raw fuel ).NO no such gas measurement.did you mean CO this is carbon monoxide or incomplete combustion.(all the fuel is not being burnt).if you mean NOX this is nitrates of oxide and is related to a heat problem.(motor running hot,bad catalytic converter).its probably getting too much fuel and not burning it all,possibly tune-up problem,carburetor(if it has one),bad fuel injection system(dirty injectors),computer(if it has one)may be getting a wrong signal.these are in reference of high HC and CO.for high NOX cooling system not keeping motor cool enough,cooling fan problem(weather clutch fan or electrically controlled cooling fan),poor cooling system circulation,bad catalytic converter.not a running lean problem as the other gases indicate rich problem.the converter may not be able to convert the emission gases to H2O and CO2 out the tailpipe.

running too rich, probable causes spark plugs, pcv valve malfunction, leaking injectors, vacuum leak, catalytic convertor, o2 sensor,

Sticking egr will raise everything except nox. Bad o2 bad cat hard to give an accurate diagnosis with out checking it

with that many miles, the catalayic converter on the exhaust is most likely worn out and needs to be replaced.

Not sure, but did you replace the oxygen sensors. Is your catalytic converter still good?