I am having a low end stumble from 1000 RPM to 2000 RPM. I mechanic guy(who didn't tune it) states he thinks it's a problem with the fuel trims?
I data logged my O2 sensors and the fronts were always reading the same values.
HOWEVER. the 2 back ones were different. I had no reading on one sensor and a choppy reading on the other. When the stumble occurred during acceleration, the back O2 sensor that was reading would bounce all aroung.
My mechanic guy states the back sensors don't figure very much into the tune.
Finally my question(s)
Is it normal for one O2 sensor to be off and one on?
Is the starnge reading a possible cause of the stumble or a result of the stumble?
Any insight would be appreciated.
Lastly changed TPS, IAC, New plugs and fuel filter.
The stumble is less in cold weather and worse with hot weather???
I data logged my O2 sensors and the fronts were always reading the same values.
HOWEVER. the 2 back ones were different. I had no reading on one sensor and a choppy reading on the other. When the stumble occurred during acceleration, the back O2 sensor that was reading would bounce all aroung.
My mechanic guy states the back sensors don't figure very much into the tune.
Finally my question(s)
Is it normal for one O2 sensor to be off and one on?
Is the starnge reading a possible cause of the stumble or a result of the stumble?
Any insight would be appreciated.
Lastly changed TPS, IAC, New plugs and fuel filter.
The stumble is less in cold weather and worse with hot weather???