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View Full Version : SMOG question. Failed 3 times

90240sr
12-12-2009, 03:43 PM
92 240sx with a KA24DE

1st TIME
Changed spark plug wires, spark plugs, o2 sensor.
NO 15mph measured 1015 and passing is 799 DIDNT PASS
25mph measured 715 and passing was 738 PASSED

2nd TIME
Sea foamed car, sprayed throttle body cleaner in the egr system
NO 15mph measured 791 and passing is 799 PASSED
25mph measured 1035 and passing is 738 DIDNT PASS

* KINDA WEIRD THAT IS SWITCHED.

3rd TIME
Changed out Catalytic converter.
NO 15mph measured 2066 and passing is 799 DIDNT PASS
25mph measured 2087 and passing is 738 DIDNT PASS

* Now im super confused cause it got way worse and i put in a brand new cat. Does anyone have any ideas? I passed all other CO and HC tests by alot BTW. Thanks
LayNLow
12-12-2009, 05:00 PM
Obviously the cat is your problem. Did you get a used cat? or a brand new aftermarket cat?
90240sr
12-12-2009, 05:07 PM
I got brand new magnaflow cat from PDM racing 2.5 inch. Looked super legit and no dents or scratches.
redline racer510
12-12-2009, 06:11 PM
i would try a stock replacement cat.
Sako
12-12-2009, 06:24 PM
Was the car warm when the smog check was done? Catalytic converters tend to not work so well when the engine isn't at normal operating temps.
Z32TT-R
12-12-2009, 06:35 PM
I got brand new magnaflow cat from PDM racing 2.5 inch. Looked super legit and no dents or scratches.

you should of asked them if it was ok for that cat to be used in CA bc alot of aftermarket cats are only 49 legal which leaves out CA hence prob the bad results
90240sr
12-12-2009, 07:34 PM
I drove it about 10 miles so i am pretty sure it was warm. I bought a replacement one from them for my AE86 and it passed. Has anyone ever used one of there cats? Does anyone have a stock working one i could borrow?
90240sr
12-14-2009, 04:32 PM
After i seafoamed my car i changed my oil right away. Could it be that after driving it the excess crap form the seafoam dirtied up my oil. Any suggestions?
94_240sx
12-14-2009, 07:48 PM
I've failed emission in TX for the past 3 years and this year I got the used cat and passed with very low numbers. In the past, I used RXP and Guarantee to Pass chemicals from Autozone and barely made it. OEM cat is 3 way and aftermarket is 2 way. Used OEM cat should be better than new aftermarket one.
90240sr
12-15-2009, 01:48 PM
Ok ill try to find a good used cat. What is RXP?