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Make sure your car is hot by the time it gets tested. Drive it hard for 1/2 hour and your catalytic converter will be at their optimum. If you still fail then you need to do some work
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Re: Emissions
Found O2 sensor at exhaust manifold hanging off with no gasket so replaced it with a new (Bosch) sensor, then spent half hour looking for sub-sensor near cat till I realized I was looking at a Calif. setup, lol. It definately made a difference but MrNickleye thinks I may need new cat from riding around so fuel rich for so long and I think he may be right. Right now I have other problems as my hood cable snapped and I can't for the life of me get the hood poped even with all the great help I got off this forum, so I set up an appointment at a body shop where I know the guy and he is pretty decent. Thank you to everyone who responded.
James in NJ |
I also just went through inspection...and failed pretty bad for emissions. if anyone could help that would be cool. im gona look at the car tommorow. I think that could be the oxygen sensor. or any chance a blown headgasket could do that? the car doesnt smoke or anything so i dont think it has a blown headgasket. thanks in advance
nox std. - 1110 me - 3180 HC std. - 148 me - 197 co% std. - .83 me - .88 |
Isphius........
It appears you need an 02 sensors to bring down the CO% and the HCs. What kind of test is it? Dyno? idle? 2500rpm? Apply a vacuum (mouth suction is enough) to the EGR valve at idle and if the engine coughs and sputters, then the EGR valve and passages are ok. But the modulator or hoses may be a problem. If no change in the engine is seen, and the valve diaphram holds vacuum, then the passaged are plugged. N/A 7mge, Start with the cover (4 bolts) on the top of the intake runner. http://www.cygnusx1.net/supra/librar.../em/EM_20.html its far left in photo, middle. with a new valve job, tuneup, cat conv, 02 sensor, and clean EGR system. My #s here in Calif with Dyno test: 15mph HC. max=106...me=70 CO%. max=0.70...me=0.14 NOx. max=762...me=482 25mph HC. max=81...me=30 CO%. max=0.57...me=0.00 NOx. max=701...me=152 |
It was a dybo test. i was thinking the o2 sensor too. ill check all this out tommorow. thanks!! i need to get the nox down thou lol...the hcs and cos arent that bad. waht causes nox to be high?
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Went to reinspection today...new bosch o2 sensor, tuneup, car runs great. failed even worse this time. i dont know whats wrong with the car...im gona try a better o2 sensor and im getting a new cat soon. :(:(:(
nox - 3252/1110 HC - 255/148 co - .87/.83 |
High NOx is caused by the EGR system not working. A bad valve, modulator (or both), or plugged passages (or all of the above).
Mine was the passages. The way its set up, and if they've never been cleaned out, I'd say that it a very likely cause. See my earlier post. If you are pretty mechanically inclined, you'll see how to clean them out as you remove the valve, and the little cover on top of the intake manifold. Use a vacuum cleaner and a coat hanger/screwdriver to scrape it out. |
What if I just run a stainless steel line from my exhaust back into the intake with a ball valve? haha. Im getting kinda frsutrated with this emissions thing. I do need a new cat thou. I cant get that egr cover off....took the bolts out and it was stuck there like it was welded
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Fellas,
nice to read some SMOG notes, we've had a hullava time getting 'ol 1987 NA automatic to pass the high idle 2500 rpm test, HCs at 120 with limit 100. Did a induction cleaner for 1 hour, drip drip drip, retarded the timing to 5-BTDC, and squeaked by at 95 HCs. Also in the tank now is Super, and the injection cleaner stuff. We have a knock sensor code 52 which plan on doing the rewire for today, but the NJ purple 2011 sticker never looked so nice. I think a EGR cleaning is in order. -hansey in Paramus:stickpoke |
umm diagnostics.....
About any auto zone will assist you in plugging in a computer to tell you the codes... Then you just have to replace those parts. O2 sensor, egr...pcv valve, lots of reasons... down to a lil pin hole in a vacuum line. Decent website here with alot of on hand parts, check all those items in the emissions section.
http://www.rockauto.com/catalog/x,ca...gname,Emission |
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