92 ls400 failed CA smog test
08-20-13, 11:29 PM
#19
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Join Date: Feb 2004
Location: California
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any new results on Smog?
Hey dtLS400, did you end up finally passing the test? I recently failed the California smog test too. I'm gonna try the simple cleaning and then do a retest.
My measured numbers:
15MPH
CO2 14.7
O2 0.1
HC 52 (max 71)
CO% 0.14 (max 0.48)
NO 480 (max 524)
25MPH
CO2 14.7
O2 0.0
HC 8 (max 54)
CO% 0.02 (max 0.38)
NO 597 (max 481) - Failed
Currently my car does idle low, at about 400-450RPM
My measured numbers:
15MPH
CO2 14.7
O2 0.1
HC 52 (max 71)
CO% 0.14 (max 0.48)
NO 480 (max 524)
25MPH
CO2 14.7
O2 0.0
HC 8 (max 54)
CO% 0.02 (max 0.38)
NO 597 (max 481) - Failed
Currently my car does idle low, at about 400-450RPM
08-21-13, 12:05 AM
#20
Lexus Champion
extremely rare for cats to go bad on LS400
I even abused mine horribly by driving in "limp home" mode and getting them red hot for months before finally fixing my ECU capacitors, and I still didn't kill them
I even abused mine horribly by driving in "limp home" mode and getting them red hot for months before finally fixing my ECU capacitors, and I still didn't kill them
08-21-13, 12:43 PM
#21
Hey dtLS400, did you end up finally passing the test? I recently failed the California smog test too. I'm gonna try the simple cleaning and then do a retest.
My measured numbers:
15MPH
CO2 14.7
O2 0.1
HC 52 (max 71)
CO% 0.14 (max 0.48)
NO 480 (max 524)
25MPH
CO2 14.7
O2 0.0
HC 8 (max 54)
CO% 0.02 (max 0.38)
NO 597 (max 481) - Failed
Currently my car does idle low, at about 400-450RPM
My measured numbers:
15MPH
CO2 14.7
O2 0.1
HC 52 (max 71)
CO% 0.14 (max 0.48)
NO 480 (max 524)
25MPH
CO2 14.7
O2 0.0
HC 8 (max 54)
CO% 0.02 (max 0.38)
NO 597 (max 481) - Failed
Currently my car does idle low, at about 400-450RPM
08-22-13, 07:38 AM
#23
Quick search found this link...
http://www.smogtips.com/failed-high-...rous-oxide.cfm
Based on this.... recommendations above are right in-line... but
What about the seafoam trick to clean out the carbon deposits...Perhaps that's all it is.
For a can of seafoam and some time...it's worth a shot.
http://www.smogtips.com/failed-high-...rous-oxide.cfm
Based on this.... recommendations above are right in-line... but
What about the seafoam trick to clean out the carbon deposits...Perhaps that's all it is.
For a can of seafoam and some time...it's worth a shot.
08-22-13, 10:14 AM
#24
Lexus Champion
Toyota cats rarely(well OK, they do go out on Prii on occasion) go bad, I've heard they have more platinum and rhodium than most other OEMs.
Check the EGR - this time see if the EGR valve opens up if you apply vacuum to it. Yes there is an EGR temp sensor in our cars but manually actuating the valve is still the best check. If you want to do a de-carbonizing, don't use SeaFoam - it's basically light mineral oil and IPA. Use a top-engine cleaner/combustion chamber cleaner from GM/Honda/Chrysler. In CA, go to a boating store and get Valvtect Marine Motor Decarb. It's the same thing.
Check the EGR - this time see if the EGR valve opens up if you apply vacuum to it. Yes there is an EGR temp sensor in our cars but manually actuating the valve is still the best check. If you want to do a de-carbonizing, don't use SeaFoam - it's basically light mineral oil and IPA. Use a top-engine cleaner/combustion chamber cleaner from GM/Honda/Chrysler. In CA, go to a boating store and get Valvtect Marine Motor Decarb. It's the same thing.
08-22-13, 10:21 AM
#25
Lexus Champion
Also, how's your cooling system? And this is an old Mercedes trick but spray carb cleaner or WD-40/fogging oil on any vacuum connectors and the joints on the intake manifold to check for any vacuum leaks.
10-10-16, 05:11 PM
#29
Driver School Candidate
Join Date: Oct 2016
Location: California
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what is a vacuum transducer? can you show a picture of it?
is it call EGR vacuum modulator here?
http://www.lexls.com/tutorials/emission/egrfilter.html
TIA.
is it call EGR vacuum modulator here?
http://www.lexls.com/tutorials/emission/egrfilter.html
TIA.
10-22-16, 07:25 AM
#30
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i just got my 1992 ls passed washington smog! check that egr tube it was a problem for me. but also i passed emissions with pretty much no catalytic converters...?!
GOOD LUCK my friend i hope the smog gods are kind to you.
GOOD LUCK my friend i hope the smog gods are kind to you.
