View Full Version : Failed smog check for 1st time
12-13-2005, 10:04 PM
I posted this on the Nor Cal forum, but it occured to me that the Cali forum would also work.
I have a stock 94 TT 6 speed. It has 80,000 miles and failed the smog check.
Here are the numbers:
15 mph @1,582 rpm:
HC: 136 (84 max allowed)
CO: .54 (.49 max allowed)
35 mph @ 2,547 rpm:
HC: 57 (49 max allowed)
CO: .52 (.46 max allowed)
What was the maximum allowed in 94? I checked CARB and DMV websites to no avail. The car has passed smog for 10 years and now :(
Some say that the cat has died. What does a used one run?
12-13-2005, 10:46 PM
theres been a couple here using denatured alcohol to pass if you search you should find info .
12-13-2005, 11:09 PM
See my post in the other section...to bad you are in the Bay Area..since I can probably let you borrow mine.
12-14-2005, 12:13 AM
use 87 octane, denatured alcohol, look up the ratio first. Do oil change before you go in, and run some seafoam before you do the oil change. That may or may not help. Changing plugs back to a stock plug wouldnt hurt either.
12-14-2005, 09:40 AM
when was the last time you did a tune-up? it might be time to change the stock cat for a new one, since the car is about 12 y/o. Those are always 2 things that you can change that usually makes a big difference.
12-14-2005, 08:25 PM
damn thats high, mine measured
HC - 8
CO - 0.00
HC - 16
CO - 0.00
you can get new cats at any muffler store, they should be pretty cheap
12-14-2005, 09:48 PM
Thanks everyone. I took it to a Toyota dealer and the reading on the aft (of the cat) was high. The determination is the cat has gone bad. Bad kitty..
What is the cost of getting a muffler shop to weld on a new cat? (I don't like the idea of cutting up the exhaust manifold but maybe I can get a less restrictive cat :)
12-14-2005, 09:57 PM
It's not a bad cat. IF it was The H.C. C.O and O2 would be high and the CO2 would be low.
It just sounds like you're running a little rich.
12-14-2005, 10:39 PM
What if I were to put in hotter plugs just for the test?
Years ago I tuned carborated cars... yeah that old. Nowdays, I don't know where to start in order to lean out the fuel. Is there a shop in East Bay that I can trust?
Yes I know, hot plugs and lean fuel are not friends of turbo cars..
12-14-2005, 11:06 PM
Just retard the timing a bit. If it is possible.
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