1990 Jeep YJ issues, HELP!!!! Carb, back firing...
Ok, so I have a 1990 Jeep Wrangler Laredo, 4.2 I6, recently done:
-complete tune up, plugs, wires, cap, rotor... has msd ignition, accel distributer and msd ignition coil.
-has brand new weber carb with snorkel, most vacuum lines replaced
Exhaust had several leaks, and fell off one time which forced me to replace it. Pace setter headers now. Most of the work was sparked from loss of power, backfiring thru exhaust and carb and sluggish ride. Had no cat and little to no emission control, its a woodsing vehicle. motor was rebuilt and has about 85k on it now, still runs strong.
Loss of power (currently)- steady acceleration, slowly, goes ok. If you stomp it or do steady acceleration, but rapid, it falls on its face (bogging down) then after about a second, second and half power comes back and it takes off. Sometimes you will here a slight back fire or a nice one. No clue what else i can do to correct this, fuel pump? I still have what appears to be a exhaust leak somewhere near headers, maybe manifold? so is going back to shop tomm. Downshifting will popp, and at times when you shut off, but happens more after longer rides. Could the existing exhaust leak continue to do this?
Sounds like the accelerator pump on the carb not squirting enough fuel, may need to check the accelerator pump, check ball and fuel float level for proper operation may have gum build up, you need to disassemble the carb and clean/replace seals check all passages are clear/clean
Carb has maybe 700 miles on it. Exactly u mash the gas, bogs then takes off. Seems more when lower rpms, 2500 amd higher ifnu mash usually takes right off. Same when idling. If mash in nuetral same issue unless rpms up