the reason it failed is the NO(PPM)is at max 530 at 15 mph and 487 at 25 mph. I am new to this forum but mechanically inclined

 

ok . I just bought this car, 140,000 miles very clean, when i drove it hard i noticed a slight miss so I bought plugs,wires caps and rotors, (these vehicles are not the easiest cars to work on, I must be getting old) when I took the plugs out 3 of them were loose and 2 of them were so tight I had to use an air ratchet, i would have to assume there was no lube put on the old plugs, now the car runs hard so I'm going to try to smog it again, any assistance would be appreciated

 

Failed smog twice but just passed on my 206k sc3... high nox (2XXX @ 15mph, 7XX @ 25mph) with borderline passing HC.

Did my reading and found out high nox is related to EGR. I cleaned the EGR and passed.

 

well , went for a retest after changing oil,air filter ,plugs,caps ,rotors and cleaned the EGR valve and still failed, what should I look at next?
any help greatly appreciated

 

should I try saefoam through the PCV hose

 

did you perform a vacuum test and see if yr egr is working?

 

i did suck on the hose going to the EGR and the car died, i have put seafoam in through the PCV hose about 1/2 a can then ran it a bunch of crap came out then got my oil changed, put a can of Guaranteed to pass ran through the tank and my NOX levels went up
really need some help here

 

did u clean the little elbow with the tiny screw on the EGR valve?

 

where is that? I took the EGR off and cleaned the ports but I left the aluminum piece on. i will take it off today and clean it

 

Well, I went to the Lexus dealer today and they took a look at it and said it is the EGR Valve Vacuum Switch, I ordered 1 and they will do a pretest on it befor I smog it