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Showing results for tags 'running rich'.
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Been searching the forum for ideas on my current problem. Final stages of complete restorations of my 73 Z. My latest issue is it running rich. I have replaced the 73 carbs with 72 round tops that I completely rebuilt. The car runs fines at all rpms and speeds (actual driving it). It smells rich and does some popping thru the exhaust. I should also mention I have headers on the car. The carbs have new .100 nozzles from z therapy and N54 needles. In an attempt to lean it out I've tried incrementally adjusting the Idle nuts 1/2 turn clockwise (did it 2 times 1/4 turn at a time). According to the 72 FSM says turning the idle adjustment nut clockwise reduces fuel and turning it counterclockwise increases fuel delivery. I assume if I'm reducing fuel, I'm leaning it out. However, when I went for 1/4 turn cw to 1/2 turn, it seemed to get richer. Is the FSM correct? I know I've found other errors in the FSM before. When I originally rebuilt the carbs I set the nozzle depth at 2.2mm as recommended by the FSM. How else can I lean it out? Am I on the right track? Like I said it's running well except for the rich smell and popping thru the exhaust.
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I recently had headers and a new exhaust installed on my late 1977 280Z coupe and since then I have had a carbon like residue on the tailpipe and bumper. I understand this is referred to as running rich, are the two related or is this just a coincidence. I am not mechanically inclined and do not have the luxury of a garage that I can use to work on my car so I was wondering if there might be something my mechanic did when installing the exhaust system and header that would have caused this condition. He's a great guy and I am not looking to blame him or anything but I want it fixed and was hoping to get any info pertaining to the subject that may be helpful to him when I go back for an inspection. I have read the Cold Start Valve/Thermo Time switch and a couple of other components might be the issue but still wonder if there might be something related to or connected with the header/exhaust installation that might be helpful in resolving this. Thanks for any and all help.
