[uconn1150]

Hi Everyone...

Emissions Test here in Texas failed my baby today

Everything is good except carbon monoxide at low idle (706)...my reading was 1.97 and it needs to be 1.20

Any suggestions?

Prior to last year's test (my first with my RC) I did the plugs, wires, cap, rotor and it passed...only put on 8k during the year. Is another tune up in order? I will pull a plug when engine cools...just got back...

Thanks All!

 

[BrianT]

Well it seems like a hot engine will pass more than a cold engine does . I know using some sort of additive i can't remember what it is . Also make sure u r cat converter is in good shape .

 

[uconn1150]

Well it seems like a hot engine will pass more than a cold engine does . I know using some sort of additive i can't remember what it is . Also make sure u r cat converter is in good shape .

Thanks for input Brian.

Guaranteed to Pass comes to mind...the cat is only 2 years old...I really the combustion chambers are clean...maybe I'm just running too rich. Anyone know how to adjust the mixture on the holley 2b...the FSM doesn't address mixture...

 

[ChrisLib]

Is 87 carb or injected? High CO% is generally caused by too rich of a fuel mixture, if its carbed try adj the idle mixture, if injected ck your O2 sensor output, usually a lazy O2`ll cause high CO`s. If the HC`s are in line I wouldnt bother with any tuneup type stuff(plugs etc).

 

[uconn1150]

Is 87 carb or injected? High CO% is generally caused by too rich of a fuel mixture, if its carbed try adj the idle mixture, if injected ck your O2 sensor output, usually a lazy O2`ll cause high CO`s. If the HC`s are in line I wouldnt bother with any tuneup type stuff(plugs etc).

Chris,

It's Carbed...2bbl...where is the mixture screw...I see the idle one in the FSM, but no mixture...I'm idling at 706rpm...should I raise the rpm?

 

[BrianT]

that is a lodw idle . u need to adjust fast idle . there is not mixture screw i know of ona 2bbl a 4bbl does have one . Also just rebuild the 2bbl or get reman unit from the parts house .

 

[dodgecharger]

The mixture srews are sealed at the factory, take the carb off you should be able to see two metal caps covering the mixture screws. These need to be removed.

 

[auwing]

Make sure the truck is good and warm my 83 failed the first time but the second time i drove the dog s**t out of it passed with out a hitch

 

[Chump]

Make sure the idle speed is correct for your particular vehicle, it could even be a touch higher than specified. Also this link may give you a few ideas. air filter new?
http://www.txdps.state.tx.us/vi/publications/brochures/Failure_copy.htm

 

[uconn1150]

First of all, I'd like to thank everyone for their help. I took the truck back the following day with new plugs (2 were carbon fouled--even though only 8k on the clock), took out my K&N (placed in a clean paper one), and kept it idling in line for 35-45 mins...it passed like a champ--err, RAM!