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TDI Fuel Economy Discussions about increasing the fuel economy of your TDI engine. Non TDI related postings will be moved or removed.

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Old January 18th, 2018, 10:26   #1
Cheap guy
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Join Date: Jan 2018
Location: St Thomas Ontario
Default Help Me Help Me, Please

Hello, How is everyone? This group was boasted about to me by a friend, so I'm new here. You can call me poorbadluckbuck.

So after a bad back injury I find myself on odsp not by choice. Which means I have no money. I only need a vehicle so I can get my daughter who's an hour away for our visits. I've gone through a truck, my Audi, and a VW over the last eight years s of driving both ways.

I know .. wa wa. Such is life. My point being is I managed to get a car after my 2000 VW finally dies at 600 000km. 850 km per tank of fuel.

My new car. 2003 VW wagon TDI.
Got a deal... Ya ya, turns out it needed a new engine. Ha ha, jokes on me. ... So I did an engine swap.... Yes I owe people money. ....

When I swapped the 1.9 TDI out I took the EGR delete pipe and over sized air filter off my old 1.9 and put on my new one. While doing all this work. It seemed a good idea to delete the EGR cooler as well. Don't need it, take it off. Right?..... Then I deleted the codes with a scanner.

Here's my problem. I can't keep it out of limp mode. The fuel economy is killing me. 700 instead of 950 plus...
I've since changed the fuel filter, as a code said infificient fuel.... That code is gone.....

It seems to fall into limp mode as soon as the car starts to heat up....

New car, new moter, I don't know what sensors to check or where to start.... I thought maybe I screwed up the vacuum lines, but they checked ok..

Does anyone have any suggestions?

Thank You
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Old January 18th, 2018, 13:21   #2
InfoSec
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Join Date: Jul 2000
Location: Belmont, MI
Fuel Economy: 48-55mpg
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Load a Malone Stage 1 tune with egr delete.
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Old January 18th, 2018, 15:32   #3
Windex
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Location: Cambridge
Fuel Economy: ʎɯouoɔƎ lǝnℲ
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Even with the EGR delete, you should get the same fuel econ.

My guess is that you have a boost issue causing the limp mode and poor fuel econ.

Do you have VCDS or just a generic OBDII scanner?

Do you have any codes set for boost deviation?
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Old January 24th, 2018, 23:40   #4
turbovan+tdi
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What Windex said, you have other issues and its not the EGR causing limp mode. EGR can affect mpg as it needs to see it but that won't cause a drastic drop.
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