what repair is needed to correct this problem
Honda Q&AAsk Your Question
1993 Honda Accord Question: my 1993 honda accord fail smog to much nox
Timing and vacuum leaks are typical repairs. Is the cat original?
Replylow rider, March 08, 2011, 20:45Rookie
ReplyHal..., March 09, 2011, 13:10Master
Timing, EGR passages clogged or the cat will cause high NOx. Rainbow's in Hayward, make the call...
Replylow rider, March 09, 2011, 19:24Rookie
yes the cat is original, is it possible that the EGR is no good ?
ReplyHal..., March 09, 2011, 19:27Master
It might be the passages, not the vale. They get coked up and clogged.
Replylow rider, March 15, 2011, 18:51Rookie
could the intake control soleniod valvecause nox by not getting enough air flow
ReplyVisitor, March 15, 2011, 19:25Rookie
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 #2Vickersautorental from Vickers Auto Repair and Auto Rental of San Jose, March 08, 2011, 21:07Enthusiast
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 #3Rainbowauto from Rainbow Auto Center, March 09, 2011, 12:14Enthusiast
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 #4Visitor, March 15, 2011, 18:37
hHi repair pal question about my 1993 honda accord failing smog,could the intake control soleniod valve cause to much noxs