I have changed the o2 sensore behind the cat and a new map sensore, new air filter the car has no fuel filter the motor is aduel over head cam. it acts almost like the cat is stoped up but its not getting hot and there is good air flow coming out of the exsust.
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the cat convertor is contaminated with fuel. If the light will not go off (its always on) you have two choices: 1. install new cat(s) or Run premium fuel until light goes out. However before doing either you must first ensure the car's: air filter is new, the spark plugs are new and you put fuel injector cleaner in every tank of fuel. and you might want to replace the O2 sensor in the exhaust pipe. (fuel injectors foul up and cause spilling of fuel instead of spraying atomized fuel and if the spark plugs are fouled they ill not do complete burn of the fuel and therefore cause fuel to get into the cat converter. The O2 sensor can also cause the computer to adjust the timing to fire the plugs and cause similar issues)
Hello,when you changed the cap and rotor did you have them check the timming,the timing chain may have jumped a clog,fuel pump may be getting weak,check you air filter make sure you pull it out in case mice filled up the space undernieth the element,check or change fuel filter,,may be a bad batch of gas may have some water in it,,good luck..
If you can't answer when the last time you changed the fuel filter it might not be a bad idea to change it. It could also be a vacuum leak as older cars ran on vacuum controls for emissions and things like that. listen for a possible whistle when accelerating or air being sucked in like a vacuum cleaner. Could also be a bad map sensor, or O2 sensor.
no-- but could mean that the O2 sensor is not correct
it is a common misconception that all of the oxygen sensor are the same
the fact is that even they are known a oxygen sensors there are 2 completely different units
the sensor in the exhaust manifold before the cat converter is in fact a heated oxygen sensor and it's function is to report the exhaust composition so that the ecm can adjust the air/fuel mixture
the other is an o2 sensor located after the cat converter and fine tunes the system after the cat converter has done it's job
if the cat converter is faulty , the o2 sensor will try to have the ECM correct the mixture
the loss of power if it is a cat converter comes from a blocked exhaust system and that is most evident at high rpms or under power
Exhaust couldbe stopped up. remove the O/2 and run it for a minute with the leak and see if the power is back like it used to be. If it is change the stopped up part ( cat converter, Muffler or bent pipe) and drive on. When running with a bad O/2 the convetor can melt and cloggup ( happen all at once)