I badly need some help passing Ga smog test!

targa7088 · 11-12-2011, 06:36 PM

I have an 88 N/A 5spd, and I cannot pass the smog test to save my life! So far I've done a complete tune up, the converter is new, EGR valve works, Timing is dead on, and I only use 93 octane gas. My last readings are as follows:

readings allowed

HC 364H-376L 140H-144L

CO 2.76H-3.34L 0.89H-0.81L

NoX 501H-564L 984H-1077L

the H's are for the high speed(25mph) portion, and the L's are low speed(15mph) test. any help would be greatly appreciated, I'm baffled right now! can anyone help me!!

Awyman18 · 11-12-2011, 09:14 PM

well....believe it or not, ur catalytic converters are probably bad..lol ur car is old, so they most likely are old and poopy inside. Check ur cats, go under ur car, and see if u can kinda smack them around lol if u here any chinging inside, or any sort of sound...like almost dirt moving around. Most likely ur cat is bad, so its not working properly, which inturn means u will not pass smog test.

targa7088 · 11-12-2011, 09:58 PM

the converter is 3 months old. it was hollow when i bought the car, so i replaced it.

Awyman18 · 11-12-2011, 10:33 PM

which cat? theres one on the downpipe, which go bad pretty quickly, and then the one that would be ur cat back? if one of them was hollowed out, the 2nd one was probably hollowed out too

Sonyps307 · 11-12-2011, 11:54 PM

The NA's only have one cat and the turbos have 2 cats. Unless the car is from cali then it would have 2 cats. I think the vsv under the intake has something to do with smog. But Im not sure.

targa7088 · 11-13-2011, 12:49 AM

hmm now we're getting somewhere, the car probably did have 2 cats on it, the one i replaced is in the middle of the system,not directly after the manifold,see, the car came from florida, where they did away with emissions over 20 years ago so you could imagine....... i bet another cat con would help it out, because this thing runs like a champ, has tons of power (for an N/A car), and like I've said in the first post, everything checks out, timing, tune up, sensors, freakin errrrything! I've done emissions, and emission repair before, so i'm pretty familliar with how everything works. It's just that i've never really had to mess with one of these cars, this is my first supra so these tips from yous guys are awsome! I've owned rotary cars, SR20cars, I could get around those pretty easily. Too bad this engine has electronic advance........ But any how, thanks again for the tips, if anyone has more tips....keep'em flowin I certainly do appreciate them. Thanks again fellas

Busted Knuckles · 11-17-2011, 02:17 AM

Your HCs are way too high. I had a similar problem with my '88 and GA smog. The oxygen sensor was not functioning, but was present, so the computer never set a code.

I'd replace the oxygen sensor, but only use a Toyota factory sensor. The Botsched sensor sold at most auto parts stores are junk and don't work in Supras. It will cost a tad bit more, but will work.

targa7088 · 11-17-2011, 03:12 AM

Is denso is OEM for this part? same with me, no CEL on, and it does work, no codes present. it's a good thing I don't really drive it, I'd be buying another cat pretty soon! since the cat install, i've only driven it to and from the emissions station after warming it up really good.

cre · 11-17-2011, 06:17 AM

Bosch sensors are fine, it's hard to screw up a narrow band sensor.... Now if the folks at the store are in the habit of dropping them or you think soldering dissimilar metal wires is OK, well, that's another story. Yes, I think Denso is the OEM.

Wouldn't hurt to test the AFM; The 7M-GE's VAFM is a wear component.

targa7088 · 02-20-2012, 12:03 AM

Since the last post, it passed. I changed the O2 sensor, it just so happens that the old sensor sounded like it was broken apart inside, like a blown light bulb, and noticed that there was a hose missing from the intake tube. That combination brought the numbers down to where they needed to be. The car runs great, just need to take care of the little things. Again thank you guys for your help.

11-12-2011, 06:36 PM	#1
targa7088 Stock Join Date: Nov 2011 Location: north GA Posts: 9	I badly need some help passing Ga smog test! I have an 88 N/A 5spd, and I cannot pass the smog test to save my life! So far I've done a complete tune up, the converter is new, EGR valve works, Timing is dead on, and I only use 93 octane gas. My last readings are as follows: readings allowed HC 364H-376L 140H-144L CO 2.76H-3.34L 0.89H-0.81L NoX 501H-564L 984H-1077L the H's are for the high speed(25mph) portion, and the L's are low speed(15mph) test. any help would be greatly appreciated, I'm baffled right now! can anyone help me!!

11-13-2011, 12:49 AM	#6
targa7088 Stock Join Date: Nov 2011 Location: north GA Posts: 9	hmm now we're getting somewhere, the car probably did have 2 cats on it, the one i replaced is in the middle of the system,not directly after the manifold,see, the car came from florida, where they did away with emissions over 20 years ago so you could imagine....... i bet another cat con would help it out, because this thing runs like a champ, has tons of power (for an N/A car), and like I've said in the first post, everything checks out, timing, tune up, sensors, freakin errrrything! I've done emissions, and emission repair before, so i'm pretty familliar with how everything works. It's just that i've never really had to mess with one of these cars, this is my first supra so these tips from yous guys are awsome! I've owned rotary cars, SR20cars, I could get around those pretty easily. Too bad this engine has electronic advance........ But any how, thanks again for the tips, if anyone has more tips....keep'em flowin I certainly do appreciate them. Thanks again fellas Last edited by targa7088; 11-13-2011 at 01:50 AM.

11-17-2011, 06:17 AM	#9
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Bosch sensors are fine, it's hard to screw up a narrow band sensor.... Now if the folks at the store are in the habit of dropping them or you think soldering dissimilar metal wires is OK, well, that's another story. Yes, I think Denso is the OEM. Wouldn't hurt to test the AFM; The 7M-GE's VAFM is a wear component. __________________ 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, 12:03 AM	#10
targa7088 Stock Join Date: Nov 2011 Location: north GA Posts: 9	Thanks for helping me out guys! Since the last post, it passed. I changed the O2 sensor, it just so happens that the old sensor sounded like it was broken apart inside, like a blown light bulb, and noticed that there was a hose missing from the intake tube. That combination brought the numbers down to where they needed to be. The car runs great, just need to take care of the little things. Again thank you guys for your help.

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11-12-2011, 09:14 PM	#2
Awyman18 3" Exhaust Join Date: Apr 2011 Location: columbus Posts: 151	well....believe it or not, ur catalytic converters are probably bad..lol ur car is old, so they most likely are old and poopy inside. Check ur cats, go under ur car, and see if u can kinda smack them around lol if u here any chinging inside, or any sort of sound...like almost dirt moving around. Most likely ur cat is bad, so its not working properly, which inturn means u will not pass smog test.

11-12-2011, 09:58 PM	#3
targa7088 Stock Join Date: Nov 2011 Location: north GA Posts: 9	the converter is 3 months old. it was hollow when i bought the car, so i replaced it.

11-12-2011, 10:33 PM	#4
Awyman18 3" Exhaust Join Date: Apr 2011 Location: columbus Posts: 151	which cat? theres one on the downpipe, which go bad pretty quickly, and then the one that would be ur cat back? if one of them was hollowed out, the 2nd one was probably hollowed out too

11-12-2011, 11:54 PM	#5
Sonyps307 Lexus & 550's Join Date: May 2010 Location: Baltimore Posts: 526	The NA's only have one cat and the turbos have 2 cats. Unless the car is from cali then it would have 2 cats. I think the vsv under the intake has something to do with smog. But Im not sure.

11-17-2011, 02:17 AM	#7
Busted Knuckles 12psi boost Join Date: Dec 2007 Location: Atlanta Posts: 300	Your HCs are way too high. I had a similar problem with my '88 and GA smog. The oxygen sensor was not functioning, but was present, so the computer never set a code. I'd replace the oxygen sensor, but only use a Toyota factory sensor. The Botsched sensor sold at most auto parts stores are junk and don't work in Supras. It will cost a tad bit more, but will work.

11-17-2011, 03:12 AM	#8
targa7088 Stock Join Date: Nov 2011 Location: north GA Posts: 9	Is denso is OEM for this part? same with me, no CEL on, and it does work, no codes present. it's a good thing I don't really drive it, I'd be buying another cat pretty soon! since the cat install, i've only driven it to and from the emissions station after warming it up really good.