Having a little trouble passing emissions test

[playadeloro]

A friend is having a bit of a prob. in his inspection.

Here's what he's done so far to get his emissions down to were it aught to be.

On-board computer diagnostics systems says all is ok.
1993 Econoline E-150
4.9 engine
new oxygen sensor
new catalytic converter
recent oil changed twice since restarting about 3 wks ago
complete tune-up
no missing
runs like a top
vehicle sat for about a year, started again about 3 wks ago.
since started again, about 1,500 miles
engine has 245,000 mi.. does not use any oil
only test failed is Hydrocarbons, should be 129, but is at 292.

Anybody with any ideas, .. ????

Thanks guys
Paul Gerdes

[ModMech]

High H/C is typically due to excessive "blow-by". Change the PCV valve (cheap and easy), and try again as they can cause this on a sound engine.