I have 91 honda accord 2.2 {136951 miles} that failed emmissions hc 269 co 4.56 nox 1400 the frist time. It had a bad o2 pulled vaccum on egr and the car died. ok. retested hc 155 co .83 nox 1500. then i went and pulled the plugs on the intake which i had read... Login to read more.