Thread: Fuel consumption up after fitting EGR blanking kit

Hi Mario,
On one of my regular journeys (in now sold TD6) I would consistently get 10.5 L/100 before fitting the EGR Blanking, after fitting this went to 10.1-10.2. so economy improved.
cheers, Peter

Originally Posted by peter g

Hi Mario,
On one of my regular journeys (in now sold TD6) I would consistently get 10.5 L/100 before fitting the EGR Blanking, after fitting this went to 10.1-10.2. so economy improved.
cheers, Peter

Hmm interesting, so there is something causing it. it's only .5 of a litre more , but it equates to nearly 5 litres over a tank.
I did some more googling and it brought up an old post on AULRO, http://www.aulro.com/afvb/technical-...0401-20-a.html
Cause: a leak from a split vacuum hose from the EGR ( the Grey one with the Blue strip ) had a split. I have examined this hose on mine at the EGR end and it looks ok, but cant seem to find the other end of it as it disappears on the side of the passenger side of engine, it's pretty hard to get to, so it might be removing the top engine cover to give some more light to it. It is the only hose that was disturbed when I pulled it off the EGR, maybe the removing caused the hose to split somewhere along it's length.
Cheers, Mario

I tried something today, I disconnected the battery for 10 mins , then joined the disconnected POS & NEG leads together for 10 mins, I read that doing this resets the ECU .
So after 10mions I reconnected the battery and and took her fro a drive.
Immediately I got a fuel consumption reading of 26.1 litres per 100 kms.! but as I drove it started to come down, it got as low as 7.5 litres per 100 kph. I drove for 40 kms and it strated to move to 8.5 then to 9 and settled at 9.5 - 9.9 for most of the journey, acceleration up steep hills increased it to 10.1 litres per 100kms, so I was very happy. but now it's creeping back up to and sitting 11.1 litres per 100 kms, so I'm at a loss.
I can't find a suspected vacuum leak anywhere, so at a loss.


The only error code is that P0401-20 extended fault path exhaust gas recirculation governor deviation - negative deviation. which has me stumped.

Interccooler to intake hoses are replaced so no leak there. Vacuum hoses all hold suction so no leaks there.

PS, just went for another drive and fuel consumption has dropped again., it's now around 10.3 around town, I noticed this relates to lower ambient temperature, temp was 17.5C, earlier on when the Ambient temp was up around 26c the fuel consumption was higher. co incidence?

It might be time to flush out the intercooler.

Originally Posted by rar110

It might be time to flush out the inter cooler.

Would a gunked up inter cooler cause these symptoms?

If it's running better cold then maybe. I presume on the td6 oil vapour enters the turbo intake and then travels with clean air through the intercooler. If the crank case ventilation filter isn't working well there could be extra oil in the ventilated air.

Fuel consumption will always go higher as ambient temperature increases providing the engine is at operating temperature, ie has warmed-up. Cooler air is denser so provides more oxygen for more efficient combustion.

Originally Posted by rar110

If the crank case ventilation filter isn't working well there could be extra oil in the ventilated air.

The Crank case filter has replaced by the later modified cyclonic filter, so clogged filters are out of the equasion