my 1993 honda accord fail smog to much nox on 1993 Honda Accord

what repair is needed to correct this problem

by in Hayward, CA on March 08, 2011
5 answers 6 comments
ANSWER by , March 08, 2011
Timing and vacuum leaks are typical repairs. Is the cat original?
COMMENT by , March 08, 2011
yes
COMMENT by , March 09, 2011
Timing, EGR passages clogged or the cat will cause high NOx. Rainbow's in Hayward, make the call...
COMMENT by , March 09, 2011
yes the cat is original, is it possible that the EGR is no good ?
COMMENT by , March 09, 2011
It might be the passages, not the vale. They get coked up and clogged.
COMMENT by , March 15, 2011
could the intake control soleniod valvecause nox by not getting enough air flow
COMMENT by , March 15, 2011
IAC Valve is only to control idle when your foot is off the gas pedal like when you're stopped. I let's air get into the engine while the butterfly is still closed.
ANSWER by , March 08, 2011
95% of the time high NOX only is caused by a malfunction in the EGR system, if you want to bring it by, we will take a 15 min look at the vehicle at no charge
ANSWER by , March 09, 2011
Check the egr systme first,common failure with the control valve,timing check cause you don't want to over look simple thing.. Third possiable bad catalitic converter... I would check the easy stuff first, timing,egr passage clogged,egr signal and cataltic converter.....
ANSWER by , March 15, 2011
hHi repair pal question about my 1993 honda accord failing smog,could the intake control soleniod valve cause to much noxs
ANSWER by , February 22, 2016
What is the gaping for ajusting intake and exhaust vale on my 93 honda accord?