Jump to content




Help With Smog


  • You cannot reply to this topic
4 replies to this topic

#1
mycotopian

  • Slowpoke
  • PipPip
    • Group: Members
    • Drives: 1987 CRX HF
I just had my 87 CRX DX in for california smog. I failed due to excessive NO (PPM)

My results were



Any tips on what I can do to get these numbers back inline?

#2
RARECRX

  • Officially retired.
  • PipPipPipPipPip
    • Group: 2009 Contributing Member
    • Location:Nor Cal
    • Drives: 1987 crx si,1985 CRX si, 2009 RS6,pimp'd out corolla,
    • Image Gallery
    Garage View Garage
What have you done to "prepare" for smog? Yes, we as californians have to "prpare" our older cars for this LOL...

How is your O2 sensor? When mine was not cycling it measured high NO(ppm) as yours did..

Has the catalytic been changed at all?

Does it need a tune up? etc...

#3
mycotopian

  • Slowpoke
  • PipPip
    • Group: Members
    • Drives: 1987 CRX HF
I just notice my timing is at full advance. What effect would that have?

#4
RARECRX

  • Officially retired.
  • PipPipPipPipPip
    • Group: 2009 Contributing Member
    • Location:Nor Cal
    • Drives: 1987 crx si,1985 CRX si, 2009 RS6,pimp'd out corolla,
    • Image Gallery
    Garage View Garage
Thats why you are failing .. It will cause hot spots in the combustion chambers increasing NOx..

#5
acexxxoasis

  • Slowpoke
  • PipPip
    • Group: 2009 Contributing Member
    • Location:Corona Ca
    • Drives: 87 crx si, 88 toyota 1/2 ton, 92 4runner
egr. your cats fine and NOx is due to high heat in the combustion chamber so its a carb car you might not be hitting closed loop. did you do a tune up recently? check if your timing advance is working right. It wont create a hot spot it will run hot though, your fighting your pistons by firing too soon its pushing down and wasting what power you do have also check for vacuum leaks, time it, new cap and rotor wires and plugs also air filter and oil change and check your egr since that is its job to keep NOx in check. with those things you SHOULD pass
looking to boost!

UTI student