View Full Version : Emissiom Problems....

04-02-2007, 09:30 PM
Background: '94 YJ with 2.5 L, 4cyl. 196K miles but was rebuilt at 134K.

I am already $500 into the emissions testing. Has failed three time. My mechanic, who is great, has no clue what else to do. I have already changed what I could: rotor, cap, plugs, wires, O2, air filter. He has already cleaned the carbon build up and changed the cat. What are we missing? There is no EGR valve. It is .010 over on the NOX., which is where it failed the first time at. He told me to run Chevron the next few days to try to clean the new cat out. So I took the long way home, I10 to Sun Valley Parkway( Bell) back to Surprise. I had the little engine runnin' 70+ for most of the trip, which is not like me, But...
I called a Jeep buddy of mine in CA. and he says CA. is keeping track of money an individual spends to try to pass emissions but if he/she reaches a certain dollar amount CA will give you a "free" lifetime waiver. Anything like that in AZ? AWW! I cant afford the new ('04/05 LJ) I want and I just bought Poison Spyder rocker for the YJ. Any advises or information would be GREATLy appreciated. Thanks all..

Fire Ball
04-02-2007, 09:59 PM
Problems could be mixture maybe a little lean. Or try taking the fuel tank down to half and add about a gallon of denatured alcohol. After the test fill up the tank again with unleaded.

These are things I have been told to do in the past and passed emissions.

04-03-2007, 10:49 AM
aaack! be careful with alcohol (largly water!)... has much lower octane (which will improve emissions) so will make sluggish and hard to start when cold.

have you had injector(s) cleaned (can't remember if is mpi or tb)

04-03-2007, 12:57 PM
I seem to recall there being a similar waiver here in Arizona...ah yes...here:



A waiver is an official document that allows qualified owners of failing vehicles to register their vehicle without further expenditures for repair. Vehicles may receive only one repair waiver, which is valid for the current vehicle registration. Once a waiver has been granted, the vehicle is not eligible for another waiver in future years. Failing vehicles that have already received a waiver must be repaired and pass inspection before being registered in the Phoenix or Tucson metro areas. If your vehicle fails, it may be better for you to repair the vehicle than to seek a waiver. In order to request a waiver, the vehicle owner must meet the following qualifications:

The vehicle must fail the state emissions test at least two times
The malfunction must be diagnosed and a low emissions tune-up performed following the initial failure (low emissions tune-up is defined under "A" on the back of the vehicle inspection report)
The vehicle must be presented to one of the waiver facilities listed below, along with the vehicle's last failing test report, detailed repair receipts or estimates
A waiver will be issued if it is determined that additional repairs to reduce the vehicle's emissions level cannot be made within the appropriate maximum repair cost limits. Maximum repair requirements for emission failures depend on the age and location of your vehicle. Due to the severity of the air quality problem in metro Phoenix, repair cost limits in Phoenix are higher than in Tucson
Waivers cannot be issued to vehicles emitting more than two times the applicable emission standard, or that have a faulty catalytic converter.
Maximum Repair Cost Limits
Age of Vehicle Phoenix Area Tucson Area
1980 and newer $450 $300
1975 - 1979 $300 $200
1974 and older $200 $50
Heavy duty diesel $500 $300

04-10-2007, 03:01 PM
Thanks for the input. Well as of today, it has FINALLY passed emissions. It was the cat. According to my ASE mechanic, the 4 cyl. are know to burn through cats like a wild fire. The second one installed was a "FORD" style cat, which was no charge. Thanks for your concern and we'll see ya out on the trail, legally.

Billy 4 hp
04-11-2007, 09:39 PM
Glad to see you made it through emissions....

If your interested about learning about methanol: http://www.ethanol-gec.org/clean/cf05.htm

Never use denatured alcohol other than clean out a cut after working on your Jeep... Fireball "Wheeling Green" come on wheel green but fudge emissions :confused: Here is the low down on denatured alcohol: http://en.wikipedia.org/wiki/Denatured_alcohol

And here is some decent info on octane ratings and does a good part to dispell the myths of what octane is and how it works pertain to performance as well as emissions: http://en.wikipedia.org/wiki/Octane_rating