That and overall mpg for country living including idling to open the garage doors, gate, this and that dropped from 16.6 to 15.6 within the last year. Idle crept up from 600 to around 700 (best guess). Every time you gave it a toe's worth of gas the rpms would run up over 1000 and come back down slowly. If in gear, and rolling along in idle, if you shifted into N, the engine would run up over 1000 and come back down.
I thought I had an emission baffle that was sticking because it used to not do that and now it's bugging me big time. Got on the www and asked the question. Got the answer from one of these online mechanic troubleshooting sites.
The throttle is "fly by wire"....like aircraft so there is no cable sticking. The problem is the butterfly,which they call the "throttle body", that regulates air flow into the intake manifold gets loaded up with crud and that restricts the air input. The computer senses rpms lower than spec and shoots some extra fuel into the cylinders to bring the rpms back up.
The answer stated that it needs to be cleaned and that should be done periodically...I'm at 35k miles and 7 years. Whipped out the cleaner and some swabs and towels and yepper the cylinder and tips of the butterfly were caked with a black oily mess....where'd the oil come from??????? It looks like the EGR valve is down wind of the butterfly and no place for oil to enter ahead of it.
Got-r-done and per the instructions cranked up and let her idle for several minutes for two reasons: to let the engine warm up and lower the rpms, and to let the computer adjust to the new air flow. Worked like a clock; just like new.
I just had it over at the dealer for the annual inspection and went by the service mgr and asked him if there was anything I needed to have done with it's age and mileage. Any codes showing? Nope! Nothing to fix...............next time I stop by there or I may deliberately go by on my next trip to town, he will learn that yes there is something that needs to be done from time to time.
Apparently it affects all the engines listed above and has been a problem for more than 15 model years. Now that the idle works like it should, I need to drive it for awhile and see if my MPG returns to where it was.
I thought I had an emission baffle that was sticking because it used to not do that and now it's bugging me big time. Got on the www and asked the question. Got the answer from one of these online mechanic troubleshooting sites.
The throttle is "fly by wire"....like aircraft so there is no cable sticking. The problem is the butterfly,which they call the "throttle body", that regulates air flow into the intake manifold gets loaded up with crud and that restricts the air input. The computer senses rpms lower than spec and shoots some extra fuel into the cylinders to bring the rpms back up.
The answer stated that it needs to be cleaned and that should be done periodically...I'm at 35k miles and 7 years. Whipped out the cleaner and some swabs and towels and yepper the cylinder and tips of the butterfly were caked with a black oily mess....where'd the oil come from??????? It looks like the EGR valve is down wind of the butterfly and no place for oil to enter ahead of it.
Got-r-done and per the instructions cranked up and let her idle for several minutes for two reasons: to let the engine warm up and lower the rpms, and to let the computer adjust to the new air flow. Worked like a clock; just like new.
I just had it over at the dealer for the annual inspection and went by the service mgr and asked him if there was anything I needed to have done with it's age and mileage. Any codes showing? Nope! Nothing to fix...............next time I stop by there or I may deliberately go by on my next trip to town, he will learn that yes there is something that needs to be done from time to time.
Apparently it affects all the engines listed above and has been a problem for more than 15 model years. Now that the idle works like it should, I need to drive it for awhile and see if my MPG returns to where it was.