Failed smog, help!!!!
Thread Starter
Instructor
Joined: Dec 2004
Posts: 105
Likes: 0
Failed smog, help!!!!
I live in CA and have to go to a test only site. I changed the oil, spark plugs not to long ago, new oxygen sensor and pcv valve. I dont think the car is heavily modifed basically stock. Heres my numbers, any suggestions greatly appreciated. Car runs good with no codes. 
15mph
HC / CO / NO
Max 128 / .80 / 1106
Measured 115 / 1.67 / 1119
25mph
Max 103 / .60 / 936
Measured 159 / 1.42 / 1018
I also throughly cleaned the IAC (dont know if that matters)
15mph
HC / CO / NO
Max 128 / .80 / 1106
Measured 115 / 1.67 / 1119
25mph
Max 103 / .60 / 936
Measured 159 / 1.42 / 1018
I also throughly cleaned the IAC (dont know if that matters)
Last edited by batoutofhell; Nov 14, 2005 at 08:36 PM.
Le Mans Master
Joined: Sep 2004
Posts: 6,018
Likes: 565
From: Conroe Texas
my no values were high also, but i have a leaky injector. oil change and air filter change, do not use an oil based air filter, just before taking it to the inspection station, might lower your numbers. check or change your plugs, check the wires and timing and fuel pressure. mine went from 1150 to 350 with a cat change and above, still high, but its the injector dumping in too much fuel
Thread Starter
Instructor
Joined: Dec 2004
Posts: 105
Likes: 0
I just bought the car about a year ago so i dont know if the cats have been changed. what are the symtoms of bad cats and will this drastically reduce my numbers to pass? also, this is my first vet but its a 85 do they come stock with headers or is it suppose to be the block metal ones?
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
It's rich, so either the ECM thinks it's lean and is adding unnecessary fuel, or the CAT is shot. To find out, hook up a scanner and see what the Block Learn is at Idle and in whatever Cell is equilivant to the rpms at 25mph (or just drive it and capture data). With that info, we can narrow it down.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
A rich mixture causes high CO readings. HCs are unburned fuel which can be another symptom of a rich mixture. Your NOx is close. It will likely come into line with the others. If not you can tweak the EGR or retard the timing a little to take care of the NOx.
RACE ON!!!
