dtLS400

iTrader: (1)

My 92 sc300 5 Spd just failed the hydrocarbon test. I was measured at 119 ppm which is 15 ppm over the maximum 106 ppm for HC. Wtf!!! The high speed check passed with no problem ,,
Anyone have this happen to them?
I'm
Thinking I have an exhaust leak in between header and block...

japsc85

samething happened to me about a week ago but my number was 245 and needed to be under 220 here in Texas. I ran a a few sips of sea foam through my intake manifold off a vaccuum hose, then the rest through the tank. Drove her like I stole her, took her back to test again same day, left her running until they were ready, and she passed.

dtLS400

iTrader: (1)

I digg the drive it like you stole her bit. I'll try that mang I got 15 day free retest :/

japsc85

change your oil you will be fine!!

JustChill

iTrader: (9)

Did u drive the car for a while before u smogged?

Nysc300

Clean your Erg valve

GS4_Fiend

iTrader: (22)

Post up the full readings including the 02% and C02%.

XsirousX

iTrader: (1)

The correct abbreviation is "EGR"

Nysc300

Yeah I know. Didn't catch my mistake. I failed my smog test horribly a while back. I pulled the EGR valve off and passed.

dtLS400

iTrader: (1)

Just did tune up the night before, oil , filter, spark plugs, wires, air filter, cleaned maf and throttle body as well as I could. Only the low speed shows up as fail high speed was fine.

dtLS400

iTrader: (1)

I drove it for about 30 mins but never passed 60 mph, reason being it was raining and I have bald tires.

GS4_Fiend

iTrader: (22)

NOX should go up and it should failed for Visual inspection.

g4ebguy90

Hydrocarbons if fuel, so you running rich, I would also check EGR as that operates at low engine speed.

dtLS400

iTrader: (1)

%co2. %o2
15mph. 14.6 .3
25mph. 14.7 .1

GS4_Fiend

iTrader: (22)

I said full readings. Lol. HC,CO,NOX