mrfiat
Veteran Member
- Joined
- Mar 24, 2008
- Location
- Los Ranchos, NM
- TDI
- 2003 Jetta TDI (Reflex Silver) , 2003 Jetta TDI Wagon (Black)
I have had my 2003 Jetta TDI sedan since November, 2017. When I bought the car (before I did anything to it) I was getting 34 mpg in the city. When I do city driving, I do about 25% highway driving. After I replaced the thermostat and replaced the rear calipers, my mileage went up to 38.5. That was just one tank though. I then replaced the fuel injectors and did a tune from Kerma. I had Charlie do a performance/economy tune and ended up with 36.5 mpg on the next tank. I then went back to Charlie and had him do a pure economy tune. I'm going to get about 36.5 mpg on my current tank as well with the economy tune.
There at people on here that get 42 mpg in the city with the same engine/car.
Should I just give up in my quest for better FE and be happy with 36.5? Does anyone have any suggestions for things to check?
Here is what has been done to the car in my quest for better FE:
* Replaced intake manifold (old one was 40% coked up - did not clean out the intake ports on the head)
* Replaced ASV valve (old one was coked up)
* Replaced both rear calipers (old ones were dragging, new one spin freely)
* Cleaned snow screen. (40% clogged)
* Checked injection timing with Vagcom. Set to intersect with green line.
* Set IQ to 3.0. (I had this at 5.8 and Kerma told me to set it to 3.0. Didn't make any difference)
* Tire pressures are at 45 psi.
* Replaced all of the smaller vacuum lines.
* Replaced turbo actuator. (It is adjusted correctly)
* Tested N75 valve.
* Replaced MAP sensor.
* Replaced fuel filter and air filter.
* New timing belt, rollers, etc 1 year ago. (Done by previous owner at Autobahn Motorworks in Phoenix)
(static timing has not be rechecked, but I think this is a VW knowledgable shop)
* I try to keep the car at 2000 rpm when not accelerating.
* I use 5th gear whenever possible down to 45 mph.
* Replaced vacuum reservoir and brake master vacuum hose with new ones.
* Tested vacuum and got 24".
* Did full EGR delete.
* Checked intercooler and no oil came pouring out of it. (removed the hose from the turbo to check it)
* Checked engine temperature multiple times. (Average 188-195 degrees F)
* Cat and muffler were replaced with a straight pipe.
* Checked odometer against GPS and I am correcting the mpg figures.
* Installed Panzer plate to replace missing bottom engine cover.
* Replaced thermostat and coolant temperature sensor.
* Adjusted turbo actuator so it has the correct amount of boost. (used Vagcom)
* Fixed cap on the top of the fuel tank. (wasn't screwed in and was leaking fuel)
* Replaced fuel injectors with Bosio DLC 520 injectors.
* Did KermaTDI tune with EGR delete.
* Front end alignment done recently.
Thanks!
There at people on here that get 42 mpg in the city with the same engine/car.
Should I just give up in my quest for better FE and be happy with 36.5? Does anyone have any suggestions for things to check?
Here is what has been done to the car in my quest for better FE:
* Replaced intake manifold (old one was 40% coked up - did not clean out the intake ports on the head)
* Replaced ASV valve (old one was coked up)
* Replaced both rear calipers (old ones were dragging, new one spin freely)
* Cleaned snow screen. (40% clogged)
* Checked injection timing with Vagcom. Set to intersect with green line.
* Set IQ to 3.0. (I had this at 5.8 and Kerma told me to set it to 3.0. Didn't make any difference)
* Tire pressures are at 45 psi.
* Replaced all of the smaller vacuum lines.
* Replaced turbo actuator. (It is adjusted correctly)
* Tested N75 valve.
* Replaced MAP sensor.
* Replaced fuel filter and air filter.
* New timing belt, rollers, etc 1 year ago. (Done by previous owner at Autobahn Motorworks in Phoenix)
(static timing has not be rechecked, but I think this is a VW knowledgable shop)
* I try to keep the car at 2000 rpm when not accelerating.
* I use 5th gear whenever possible down to 45 mph.
* Replaced vacuum reservoir and brake master vacuum hose with new ones.
* Tested vacuum and got 24".
* Did full EGR delete.
* Checked intercooler and no oil came pouring out of it. (removed the hose from the turbo to check it)
* Checked engine temperature multiple times. (Average 188-195 degrees F)
* Cat and muffler were replaced with a straight pipe.
* Checked odometer against GPS and I am correcting the mpg figures.
* Installed Panzer plate to replace missing bottom engine cover.
* Replaced thermostat and coolant temperature sensor.
* Adjusted turbo actuator so it has the correct amount of boost. (used Vagcom)
* Fixed cap on the top of the fuel tank. (wasn't screwed in and was leaking fuel)
* Replaced fuel injectors with Bosio DLC 520 injectors.
* Did KermaTDI tune with EGR delete.
* Front end alignment done recently.
Thanks!