failed smog need 22re smog parts
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failed smog need 22re smog parts
First off California sucks!!! high nox on my 86 4runner. so the guy at the shop said its timing, egr, or the small round valve next to the egr with the 3 ports. He said he replaces a lot of those valves. I checked timing and it was 5 btdc shorted so timing was good, checked egr and it checked good with vacuum so has to be the little black valve next to the egr or maybe the cat but I changed that 2 years ago so it shouldn't have gone bad so soon. I don't want to spend $60 at the dealer does anyone have a good one (the valve next to the egr) laying around for cheap or hopefully free.
Thanks in advance. Chuck
edit: sorry Im in Lancaster so cal area 93534
Thanks in advance. Chuck
edit: sorry Im in Lancaster so cal area 93534
Last edited by cal4runner; 10-21-2009 at 10:19 AM.
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That small valve is the egr vacuum modulator. It's easy to change out yourself. I replaced it on my 95 4Runner. Autozone had the part for about 35 bucks. Did they check that all of your vacuum lines were routed properly? Two of my hoses were crossed which were part of the problem with my high NO problem.
#3
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If the egr had vacuum at the right time then the modulator is fine, and it's probably either a stuck egr valve or clogged tubes.
Lean mixture can cause higher nox, too, and that's most likely from clogged injectors, though bad tps or vafm readings can do it too. Bad O2 sensors usually result in rich mixture. Red Line's SI-1 Complete Fuel System Cleaner has the most polyether amine, which is by far the most effective injector cleaner. CRC's "Guaranteed to Pass Emissions Test Formula" also has a good amount. Those are the only two with PEA that I know of - Techron, BG-44 and Gumout Regane apparently no longer have PEA.
Other measures you can take for the test include running 91 octane and setting your timing (with jumper attached) back to 4 deg btdc.
When was the last time your cat was replaced? If you had a new one, it would probably convert those noxes (word?)
Lean mixture can cause higher nox, too, and that's most likely from clogged injectors, though bad tps or vafm readings can do it too. Bad O2 sensors usually result in rich mixture. Red Line's SI-1 Complete Fuel System Cleaner has the most polyether amine, which is by far the most effective injector cleaner. CRC's "Guaranteed to Pass Emissions Test Formula" also has a good amount. Those are the only two with PEA that I know of - Techron, BG-44 and Gumout Regane apparently no longer have PEA.
Other measures you can take for the test include running 91 octane and setting your timing (with jumper attached) back to 4 deg btdc.
When was the last time your cat was replaced? If you had a new one, it would probably convert those noxes (word?)
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I've also seen a couple studies that indicate that ethanol, while it lowers hydrocarbon emissions, actually causes higher Nox. Hard to get away from the stuff these days, especially in CA.
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the readings
-----hc-(ppm)----------------co (%)----------------no (ppm)
max--ave---meas--------max---ave---meas-----max--ave---meas
124---41-----29---------0.78---0.13---0.03-----1089--399---1580--at-15mph
99----29-----28----------0.58---0.11---0.02------919--332---1547--at-25 mph
I replaced the cat about 4 years ago. I can check the timing again and drop it a little that might help.
-----hc-(ppm)----------------co (%)----------------no (ppm)
max--ave---meas--------max---ave---meas-----max--ave---meas
124---41-----29---------0.78---0.13---0.03-----1089--399---1580--at-15mph
99----29-----28----------0.58---0.11---0.02------919--332---1547--at-25 mph
I replaced the cat about 4 years ago. I can check the timing again and drop it a little that might help.
Last edited by cal4runner; 10-22-2009 at 12:03 PM.
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That small valve is the egr vacuum modulator. It's easy to change out yourself. I replaced it on my 95 4Runner. Autozone had the part for about 35 bucks. Did they check that all of your vacuum lines were routed properly? Two of my hoses were crossed which were part of the problem with my high NO problem.
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