Quote:
Originally Posted by jeffspower
You can do a "cheapo" A/F tuner trick (like I do  ). Weld in an o2 bung. Install cheapo parts store single wire o2 sensor. Attach a wire & run it into the cab. Attach a DVOM to it, and set it to the MV scale. 0 MV is way lean, 1000 MV is way rich. Shoot for 200-400 MV in "leisure" cruising, and 600-800 MV WOT. You will learn quickly if your carb is all- around too rich or if the power valve is coming in too soon. I'd bet your Edelbrock is way rich & all- around out of wack. Buy a jet/ calibration kit & have fun  |
I agree. Diagnosing what your average air/fuel ratio is is a great 1st step toward knowing exactly what the cause of the problem is. Also, temporarily add a vacuum gauge with a long piece of tubing. 16-21" of vacuum while cruising would be average depending on the cam you're running.
Pull your plugs. Are they sooty black? If so, that's a sure sign it's rich. The porcelain should be mostly white with a golden brown tip.
I'd guess it's severely retarded timing, stuck, bad or wrong needles/jets in the carb, or a severe vacuum leak. Emergency brakes stuck on?