SootFoot
Veteran Member
Low mpg another issue besides the crrent glow plug mismatch on our 2005 TDI (mismatch from a March 2009 warranty repair). Since its my wife's car I haven't stayed on top of it as well as I should, but I think I can correlate the mpg drop beginning to exhibit after a bad glow plug on the #2 cyl was replaced then exactly two weeks later the CEL came back on and it was the MAF and Oxygen Sensor. I don't know if that pattern indicates anything, but it was roughly after these repairs that the MPG started going south. This was quite awhile ago, actually, in late 2008.
The Tandem Pump was also replaced shortly after the Oxygen Sensor and MAF, due to an oil leak, but a new tandem pump would not be responsible for increased fuel consumption... would it?
For reference, the car was able to achieve 50mpg on the interstate and around 42 mpg in town prior to this.
It could certainly be something else, but I am just trying to correlate the loss of efficiency to known events with the engine.
Oil consumption has increased significantly as well along the same time line. Used to consume maybe 1/4 liter for a 10,000 mile OCI. Now more like 3/4 of a liter for the OCI.
42,000 miles on the car.
It does get short journey cycles, real short, because my wife's place of employment is only about 5 miles from home. In hindsight a diesel probably not the optimal choice for such short trip commuting during the week, but she does get it out and run it longer on lunch breaks, etc through the week and then on weekends it is driven longer periods.
The Tandem Pump was also replaced shortly after the Oxygen Sensor and MAF, due to an oil leak, but a new tandem pump would not be responsible for increased fuel consumption... would it?
For reference, the car was able to achieve 50mpg on the interstate and around 42 mpg in town prior to this.
It could certainly be something else, but I am just trying to correlate the loss of efficiency to known events with the engine.
Oil consumption has increased significantly as well along the same time line. Used to consume maybe 1/4 liter for a 10,000 mile OCI. Now more like 3/4 of a liter for the OCI.
42,000 miles on the car.
It does get short journey cycles, real short, because my wife's place of employment is only about 5 miles from home. In hindsight a diesel probably not the optimal choice for such short trip commuting during the week, but she does get it out and run it longer on lunch breaks, etc through the week and then on weekends it is driven longer periods.
