Thread: Failed emission test again.

Found a defective PCV tube that was letting air leak in. Replaced and the car's idle dropped to normal speed and the car ran much better.

Hydrocarbons had been 2.36 on the first test with the passing standard being .80. Second test the hydrocarbons dropped to 1.9.

What else?

PCV itself?
Catalytic Converter?
Upper Intake Manifold gasket?
Lower Intake manifold gasket?
Plugs?
All the above?

Any suggestions would be GREATLY appreciated. Registration expired 11-30 and pretty soon the cops will be pulling me over! :-(

Originally Posted by 01gpgt01

A high HC reading is the result of poor combustion. The most typical cause is a poor ignition system. HC is nothing more than fuel that makes it out the tailpipe without being burned.

Are the plugs old? are the wires old? Could be a vac leak aswell. Do you have a Scan gauge?

The plugs and wires are at least 5 years old, about 50,000 miles ago. Do not have a Scan gauge. What does a Scan gauge do?

vac would lean it out wouldnt it?

Originally Posted by matt5112

vac would lean it out wouldnt it?

Could be vac leak but where?

true...

Check the vacuum lines on the top of the engine.

There aren't many.

Just start spraying carb cleaner around and if the engine speed lowers then you've found it.

Thanks