[looneytune_2004]

ok so i have went to smog my car 3 times now and i have failed
i have failed in the measure if my HC (hydrocarbons) yet i have changed my plugs and wires to ngk all the way around as well as changed my o2 sensor. New vac lines as well as ive checked my timing and i am spot on, idle is fine yet i still get a nice epic FAIL.
the smog results are as followed Hydrocarbon at 15mph is 142 and max allowed is 106, at 25mph 113 with max being 58. And on my NOx it failed at 25mph with 948 reading but max allowed is 701.
please can someone help explain what i can do to fix this so i can get my baby on the road

 

[cricketjoe1]

i think you may be running rich for some reason. do you still have both your cats? do you have an upgraded fuel pump? i tested with a high flow cat, DP and had a walbro installed. i barely passed HC

 

[looneytune_2004]

I only have one cat. I've never had 2 cats on n e of my supras, now I did notice a slight misfire during the smog test, and I changed the o2 sensor like 5min before the test so I wonder would that affect it. And no I do not have an upgraded fuel pump. Is there any way to test my egr for proper operation

 

[sixpack]

Is the engine worn out ?
(how many miles)
It is a very old car after all.

What mods do you have ?

 

[87supramario]

ever heard about running your car on paint thinner for the test? theres a huge trick for that.

 

[sixpack]

Not any paint thinner, but Toluene.
Toluene is a pure hydrocarbon (C7H8). i.e. it contains only hydrogen and carbon atoms. It belongs to a particular category of hydrocarbons called aromatic hydrocarbons. Complete combustion of toluene yields CO2 and H2O. This fact ensures that the entire emission control system such as the catalyst and oxygen sensor of your car is unaffected. There are no metallic compounds (lead, magnesium etc), no nitro compounds and no oxygen atoms in toluene. It is made up of exactly the same ingredients as ordinary gasoline. In fact it is one of the main ingredients of gasoline.

F1 cars used 84% toluene for fuel.

But........
The car should pass with pump gas, period.
Something is wrong.
By chance is the return line pinched somewhere ?
That will cause the fuel pressure to be too high.

But again, need way more info on your car.........

 

[SoulSupra]

Did you change cap & rotor? you didn't say.
What is the CO reading?
If that was high too. Change your cat.
No sense replacing parts if the car is not running/tuned properly. Make sure your timing is right or else running too rich will dump fuel foul plugs and damage your cat.
Just like six pack said......More info needed

 

[looneytune_2004]

i didnt change the cap and rotorwill that really make a big differance even though i scrapped an sandpapered them. and
here is my full chart test done on april 23/2011
@15mph CO was .10 and max allowed is .49
@15mph CO was .06 and max allowed is .40

HC(PPM)
@15mph HC was 142 and max allowed is 106
@25mph HC was 113 and max allowed is 58

NO(PPM)
@15mph NO was 459 and max allowed is 762
@25mph NO was 948 and max allowed is 701

compared to the test i did on march 31/2011 my results were as followed
@15mph CO was .14 and max allowed is .49
@15mph CO was .08 and max allowed is .40

HC(PPM)
@15mph HC was 179 and max allowed is 106
@25mph HC was 136 and max allowed is 58

NO(PPM)
@15mph NO was 365 and max allowed is 762
@25mph NO was 490 and max allowed is 701
in between the 2 test i had my wires and plugs changed to new NGK all around as well as right before the most recent test i had changed the o2 sensor with in like 10min of the test, as well as new oil and the car had been drivin to get it to opt temp. intake is the stock setup with a clean filter, now my exhaust behind the cat is 2.5'' which was allowed on the test as well as it has a new muffler as for the cat im not sure when it was last replaced because when i bought it, it had what looks to be a new one from 2006, now when i got the car the car was sitting outside for some time with the exhaust manifold unbolted from the block. as for the motor it came from my other supra which it passed smog last year in feb. of 2010. so can any one help with the new info given
thanx all