2005 Envoy with 4.2 and 138,000 miles. The issue is it's loosing power and/or speed. When I am driving on the interstate, I always have the cruise control on but it starts to slow down or loose power, it down shifts to compensate for the loss of speed, then hangs around at high rpm for a while, then up shifts, and finally the torque converter locks up. All this happens in 30-45 seconds and happens on hills or flat roads.
I've tried driving without the cruise and nothing changes. I had to replace the water pump 2 weeks ago and while I was there I replaced the temperature sensor and thermostat. I replaced the fan clutch last summer, and while I was swapping the water pump, I took off the throttle body and cleaned it.
After I replaced the water pump, it seemed to straighten up, but it has started acting up again today. So, do I look toward the catalytic converter or throttle body sensor? While I was swapping out the water pump, I did disconnect the negative cable on the battery for about 2 hours. I've ran Sea Foam and then Techron through the fuel system as well as replacing the air filter.
I've tried driving without the cruise and nothing changes. I had to replace the water pump 2 weeks ago and while I was there I replaced the temperature sensor and thermostat. I replaced the fan clutch last summer, and while I was swapping the water pump, I took off the throttle body and cleaned it.
After I replaced the water pump, it seemed to straighten up, but it has started acting up again today. So, do I look toward the catalytic converter or throttle body sensor? While I was swapping out the water pump, I did disconnect the negative cable on the battery for about 2 hours. I've ran Sea Foam and then Techron through the fuel system as well as replacing the air filter.