still misfiring...help?
#1
still misfiring...help?
ok i have done everything i can think of, i am out of ideas. ive changed my plugs, plugwires,new fuel filter, i put some LUCAS fuel injector cleaner in it, and its still running like crap. even after all this i took it back to advance auto to get it checked AGAIN, and it threw the same codes, it threw the O2 sensor codes, both of them, because of my cat bein gutted, and it threw the code random/multiple cylinder misfires. now im thinkin its a coil pack.im completly out of ideas. please someone help?
#2
RE: still misfiring...help?
and im pretty sure my o2 sensors are completly fried. would that mess anything up? some ppl have tld me that if the o2 sensors are bad, it will cause what my cars doin, and some ppl have tld me that the o2 sensors will do nothing but throw a code the the computer and make the SES light to come on
#3
RE: still misfiring...help?
ORIGINAL: camarofreak1990
it threw the O2 sensor codes, both of them, because of my cat bein gutted...
it threw the O2 sensor codes, both of them, because of my cat bein gutted...
I don't know the year of your car, but I'm gonna presume that you also have an O2 sensor after the cat. The O2 sensors are part of the fuel management system. They read the oxygen content in the exhaust gases and adjust fuel output accordingly to keep the oxygen level within specs. Gutting the cat confuses the ECM because it can't adjust the fuel delivery to get it back into spec, and then the SES light goes on. So what's happening to you is the computer is adjusting the fuel mixture back and forth trying to get it right, which is why you get your cylinder misfire code. The easiest thing to do at this point would be to get an after cat O2 "fooler" sensor. Places like Summit or JEG's probably have one.
#10
RE: still misfiring...help?
Then that one has nothing to do with the air/fuel ratio or fuel trims. It's only purpose is to alert you that the cat is not performing up to standards. If you get a O2 simulator, it will tell the PCM that the cat is good, so the check engine light should disappear. Or you could have someone tune the codes for that sensor out. Your misfire has to do with something else. I would ask him which one it is specifically. If it is one of the other O2 sensors than that could be the problem.