I failed emmisions on the CO under load and passed everything else great. What is the first step to cure this. The engine sat a while and I had to clean it out and put back the 2 pickup tubes that fell down into the bowl. Changed the spark plugs to get it to idle right on the scope. Forgot to check the cruise circuit. 455 Stage 1 heads. 118 cam Dbl roller timing chain. 8 or 9 degrees initial? I think. HC loaded 192 allowed 450 pass CO loaded 4.36 allowed 3.75 fail HC idle 286 allowed 450 pass CO idle 4.61 allowed 5.00 pass
High CO would indicate a rich mixture. Do you have access to a 5 gas? Can you tell us the CO2 and O2 readings?
There are 7 numbers in the Q-jet part number. 7040244 would be a 1970 350 carburetor. Cruise mixture is determined by the primary rod and jet. What is AA?
44b on the primary. It looks like im going to have to disassemble or readjust the screw for the mixture that was set from the factory. This isnt a factory carb, just a mix of TA Performance carb parts we had laying around and whatever Dave had laying around. No I dont have access to a 5 gas, its an old school scope and works just fine without trying to measure 02.
No leaning it out wont be ok. Its on the cruise circuit and just wasting fuel. You cant adjust it via the 2 screws in front and she is as lean as possible and still running, almost too hot. 65 and newer require emmisions in Phoenix AZ and Cali.
No its by county. Maricopa is the only one I know of, never lived anywhere else. And its 64 and newer.
What I meant was to lean out the cruise curcuit. I understood you were past the point of adjusting the mixture screws
I dont know if it would affect the drive cycle, but changing the oil would probably get your CO's down at idle
Stock jetting is about the best for mileage. What is in it now? You said 44B primary rods, what jets?
Instead of messing around with this carb (I take it this one works well for your combo), why not just get a stock Q-jet to put on the engine for its yearly emmisions test?
