I badly need some help passing Ga smog test!

targa7088 · 11-14-2011, 10:26 PM

This car definetly came with only one converter, I'm begining to wonder if the aftermarket unit I bought is too small? I mean, it does look a little smaller than what I'm used to seeing. With the numbers I posted, is it possible that it would benefit from having another one added? I can't wait till it's 25 years old so I could swap this motor out, I know the 7m is a good motor considering the issues, but I really want a JZ block in this thing soooo bad. Thoughts anyone?

cre · 11-15-2011, 02:47 AM

What is the timing set to? Needs to be set to 10?BTDC with the diagnostic jumper in place and NO error codes stored in the ECU.

That HC and CO is too high for just a weak cat. With the NOX so low I think you're more likely looking at an incomplete burn or too much fuel (the EGR is still a consideration if it's stuck open and cooling the chamber too much for a clean burn); Your ignition timing may be retarded (whether you're timing light agrees or not) or your exhaust cam may be advanced.

Replaced the air filter recently?

Additionally, banging on a cat only tells you if it's falling to pieces; They generally fail LONG before that happen. The catalyst gets glazed over and as such doesn't interact with the gases. Also, not that continued high HC emissions will cause this glazing and neuter your cat.

targa7088 · 11-16-2011, 01:47 AM

I checked the cat, definetley not falling to pieces, and thank the car gods, because its only a couple months old! I'm gonna check the base timing with the timing belt cover off and let you guys know how it goes.

cre · 11-16-2011, 10:51 PM

Run too rich and you can kill a cat in a couple weeks.

CanadianBak'inSupra · 02-20-2012, 01:24 AM

i see that you have passed.
but when was the last time your egr was cleaned???

targa7088 · 02-27-2012, 10:17 PM

My EGR is clean and functioning, so is the VSV. The throttle plate and intake is clean as well. I have gone through the entire emission control system, and learned quite a bit about this engine on top of what I've been learning all my life, and I like this engine. At this point, the engine is well tuned up. Next is the head stud kit, and a steel head gasket, gonna need that one of these days....

11-15-2011, 02:47 AM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	What is the timing set to? Needs to be set to 10?BTDC with the diagnostic jumper in place and NO error codes stored in the ECU. That HC and CO is too high for just a weak cat. With the NOX so low I think you're more likely looking at an incomplete burn or too much fuel (the EGR is still a consideration if it's stuck open and cooling the chamber too much for a clean burn); Your ignition timing may be retarded (whether you're timing light agrees or not) or your exhaust cam may be advanced. Replaced the air filter recently? Additionally, banging on a cat only tells you if it's falling to pieces; They generally fail LONG before that happen. The catalyst gets glazed over and as such doesn't interact with the gases. Also, not that continued high HC emissions will cause this glazing and neuter your cat. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

11-16-2011, 10:51 PM	#4
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Run too rich and you can kill a cat in a couple weeks. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

02-20-2012, 01:24 AM	#5
CanadianBak'inSupra Official hall monitor / search nazi - NO SOUP FOR YOU! Join Date: Oct 2009 Location: Canada, BC Posts: 837	i see that you have passed. but when was the last time your egr was cleaned??? __________________ 1984 supra - 1uzfe - w58 - 4.10 - 1 piece aluminum shaft.

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11-14-2011, 10:26 PM	#1
targa7088 Stock Join Date: Nov 2011 Location: north GA Posts: 9	This car definetly came with only one converter, I'm begining to wonder if the aftermarket unit I bought is too small? I mean, it does look a little smaller than what I'm used to seeing. With the numbers I posted, is it possible that it would benefit from having another one added? I can't wait till it's 25 years old so I could swap this motor out, I know the 7m is a good motor considering the issues, but I really want a JZ block in this thing soooo bad. Thoughts anyone?

11-16-2011, 01:47 AM	#3
targa7088 Stock Join Date: Nov 2011 Location: north GA Posts: 9	I checked the cat, definetley not falling to pieces, and thank the car gods, because its only a couple months old! I'm gonna check the base timing with the timing belt cover off and let you guys know how it goes.

02-27-2012, 10:17 PM	#6
targa7088 Stock Join Date: Nov 2011 Location: north GA Posts: 9	My EGR is clean and functioning, so is the VSV. The throttle plate and intake is clean as well. I have gone through the entire emission control system, and learned quite a bit about this engine on top of what I've been learning all my life, and I like this engine. At this point, the engine is well tuned up. Next is the head stud kit, and a steel head gasket, gonna need that one of these days....