4.3 V6 Cylinder Misfires
#1
4.3 V6 Cylinder Misfires
Hey, gang! I'm having an issue with my 2002 S-10 Blazer equipped with a 4.3L Vortec V6. It keeps throwing a code for a Cylinder 3 Misfire and sometimes a Random, Multi-Cylinder Misfire.
We have already replaced the cap, rotor button, plugs and wires, all AC-Delco. The #3 plug was checked since the code didn't go away, after doing the tune-up, to make sure it wasn't damaged while putting it in as it was in an awkward location.
I'm thinking this may be a distributor issue, simply because of the multi-cylinder code. Any thoughts? Thanks!
We have already replaced the cap, rotor button, plugs and wires, all AC-Delco. The #3 plug was checked since the code didn't go away, after doing the tune-up, to make sure it wasn't damaged while putting it in as it was in an awkward location.
I'm thinking this may be a distributor issue, simply because of the multi-cylinder code. Any thoughts? Thanks!
#5
Have trouble with # 3 and 5 cylinder also misfiring have it at garage now says it might be spider injector system i was wandering after reading this if the o2 sensor really controls it that much some said replace it is it worth a try
#7
O2 fixed mine
O2 sensor is worth a try. I had my neighborhood mechanic hook it up to his reader, and we could tell from the numbers that the 2 of the sensors were bad.
What happens with a bad sensor:
-exhaust mix leaving the engine shows bad fuel/oxygen content mix
-computer dumps in extra gas/oxygen into cylinders
-mix worsens, and bad mix either doesn't ignite or ignites poorly
definitely worth a shot if you can afford to put new sensors in. My blazer has 198k miles on it, and i didn't think it would ever run smoothly, but after 2 o2 sensors, she purrs like a kitten
What happens with a bad sensor:
-exhaust mix leaving the engine shows bad fuel/oxygen content mix
-computer dumps in extra gas/oxygen into cylinders
-mix worsens, and bad mix either doesn't ignite or ignites poorly
definitely worth a shot if you can afford to put new sensors in. My blazer has 198k miles on it, and i didn't think it would ever run smoothly, but after 2 o2 sensors, she purrs like a kitten