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2000 gmc jimmy 4.3L misfire on cyl 4 and cyl 5 at idle when increase rpm cyl 4 cleans up but cyl 6 starts to misfire as seen on snapon scaner plugs wires cap rotor were replaced found dist gear worn bad replaced dist. compression good on all cyls injector popet valve checked they are all working no vacum leaks
forgot to say i did that already and just checked for bad valve springs all good and did leak down test that was goodforgot to say i did that already and just checked for bad valve springs all good and did leak down test that was good
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2000 GMC TRUCKS SSERIES JIMMY 4.3L 6-cyl Engine Code [W] Differential, Front......GL-5 All TEMPS......80W-90Manufacturer recommends GM part no. 1052271 or equivalent Do not add limited slip additive. Differential, With 7.25 RingGear Front..........1.2 liters Differential, With 8.25 RingGear Front..........2 liters Differential, With 9.25 RingGear Front..........2.8 liters
Probably has a plugged catalytic converter from the misfire that was on cylinder #2, which was indicated by the code. If you wanted to confirm the plugged cat, you could remove the precat O2 sensor and drive it. It will be noisy, but if you get an increase in power, you know you have a restriction
HI
P0300 is multiple misfires.
P0171 is lean burn on left bank 1 means drivers side
02 sensor is faulty. Your vehicle is over fuelling that is why your are getting P0300 code and the rotten egg smell. Good idea is to replace both 02 sensors.
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