[KesekiSupra]

ok so im wondering here. i seem to have very high hydrocarbons. and i heard thats from having too lean of a mixture. so my question is, how would i go about richening up the mixture? cooler thermostat? (got one in my room) or... (insert suggestions here, note i live in smog-nazi california so i dont quite want to modify my AFM)

 

[SupraFiend]

is your car stock? If so somethings not working right and needs to be fixed or replaced. And hydrocarbons is unburnt gasoline so your running too rich.

 

[shiva]

if it's really lean that could do it too. i wouldnt rule anything out. but yeah you might not want to just figure out ways to richen up the mixture... something is wrong and you might want to find out what it is.

what were your CO numbers like? that might help find the problem. high CO #s higher than usual will suggest that you're actually running rich. otherwise you're probably running lean or misfiring or not getting a good spark or something.

check plugs, wires, air filter, cap and rotor, timing...

are you burning any oil?

shiva

 

[KesekiSupra]

im burning oil like the iraqi's. and i have a small SMALL misfire, but i believe thats due to the exhaust leaking from my catalytic convertor. it causes flux's in the backpressure. and yea its basically stock other than a cone air filter. but it was too lean even with the stock air box. btw my CO's and NOx are at normal levels, just my HC's were high

 

[DKJones96]

that exhaust leak could be making it read too lean at the end of the pipe.

 

[KesekiSupra]

i didnt know there were any sensors in the exhaust at all? other than the ox sensor in the exhaust manifold

 

[Supra Bob]

I think he's refering to the emissions tester at the center that said your HC's were high :wink:

 

[DKJones96]

yup yup. do what i did. the only way i was able to patch an exhaust hole was to take galvenized steel 5x7 sheets and clamp them to the leak. best i could do w/out welding and i've passed emissions twice since then.

 

[MikeD]

Your EGR valve could be stuck open. That would cause high exhaust temp therefore high HC.

 

[DKJones96]

i doubt that'd be the case tho cuz the egr is supposed to be openat the speeds they test at. maybe if they tested at idle it'd be a different story.

 

[KesekiSupra]

my egr is fine or else my nox wulda been through the roof, i got a cat that wasnt OEM toyota, and it seems to leak from the top of the gasket so yea, im either gunna try to raise the cat (the cat hoist holder thingy wouldnt work so i didnt even put it back on) and re torque it, or weld it.