Oh woe is BBD me
A little history first:
- 87 4.2l., BBD carb.
- using the mopar orange ignition module with stepper motor disconnected.
- MSD Coil and wires
- about 30k km on a rebuild.
- government insurance is mandatory in Canada, and is illegal to drive without it.
- to get insurance, you must pass an emissions test every year.
I had my annual emission due so I gave my YJ a tune up. And being the smart a$$ that I am, I leaned out the carb a little. I have only an idle test, because they think YJ's are all wheel drive. I don't correct them.
I fail, high CO.
In my mind I am running to lean (to much air). So I screw the screws all the way in and back out about 2 turns. then with an expanded scale tach, I do my best to set the best lean idle. I turn the screws out slowly and evenly until the idle speed drops. Then back in until the rpm comes back.
Test number 2 and 3:
My CO is off the scale!. I know my mix is richer than it was, but here I am. the testing facility closes in 10 minutes. I quickly re-adjust the screws out (more air), run the test again, no change.
My insurance runs out tomorrow, and I can't renew without passing.
What am I missing?