Hello Folks ( first post here)

 

I have a 61 plate 1.6 Octavia TDI CRS

 

A couple of weeks ago, I had to have my EGR replaced ( motor had burned out, car was in constant limp mode)

 

I didn't have it done at a skoda garage, so was a little cheaper ( still cost £520 though) 

 

before the egr replacement, I had a long term average mpg of 55, with a commute ( 10 miles to the motorway then 50 miles up the motorway)  average of 62 ( occasionally as low as 59, or as high as 68 but nearly always 62)  - using a cruise control

 

after the cruise control, both the long term mpg and the trip mpg have dropped by about 6 mpg.  

 

simply put, does anybody have any ideas?

 

could it be that the EGR needs time to 'loosen up' before returning to something near the previous mpg  or what is likely to be wrong

 

A bit arbitrary asking this kind of question I know,   but maybe somebody has some experience, or any ideas

 

thanks.

 

I should mention, car has now done 80k miles ( 70k of them mine)

 

A broken EGR (if broken in a way that means less or no exhaust is recirculated) will tend to make a diesel engine run more efficiently than a working one, at the expense of worse NOx emissions. Maybe before the old one got so bad as to cause limp mode, it was recirculating less than it should, and giving you better economy?

Edited 3 November, 20169 yr by Wino

A broken EGR (if broken in a way that means less or no exhaust is recirculated) will tend to make a diesel engine run more efficiently than a working one, at the expense of worse NOx emissions. Maybe before the old one got so bad as to cause limp mode, it was recirculating less than it should, and giving you better economy?

 

That sounds a reasonable answer,   except the mpg had always been around the same mark or better since I had it and hadn't improved,  which would be expected if it was the egr giving better consumption through fault,   unless of course it was always faulty since  I bought it ( which wouldn't massively surprise me)

Winter Diesel at the pumps now?

Winter Diesel at the pumps now?

Yep, that plus lower temps at commute time mean I've seen a drop in usual mpg this week.

520 for an egr??? Just had mine done on 2ltr tdi Octavia .... egr was about 75 quid and took less than an hour to fit ..... and mpg is about the same although mine didn't go into limp mode, just put the engine light on

520 for an egr??? Just had mine done on 2ltr tdi Octavia .... egr was about 75 quid and took less than an hour to fit ..... and mpg is about the same although mine didn't go into limp mode, just put the engine light on

I believe the EGR valve on your engine will be considerably simpler and massively more accessible than the OPs.

Hello Folks ( first post here)

 

I have a 61 plate 1.6 Octavia TDI CRS

 

A couple of weeks ago, I had to have my EGR replaced ( motor had burned out, car was in constant limp mode)

 

I didn't have it done at a skoda garage, so was a little cheaper ( still cost £520 though) 

 

before the egr replacement, I had a long term average mpg of 55, with a commute ( 10 miles to the motorway then 50 miles up the motorway)  average of 62 ( occasionally as low as 59, or as high as 68 but nearly always 62)  - using a cruise control

 

after the cruise control, both the long term mpg and the trip mpg have dropped by about 6 mpg.  

 

simply put, does anybody have any ideas?

 

could it be that the EGR needs time to 'loosen up' before returning to something near the previous mpg  or what is likely to be wrong

 

A bit arbitrary asking this kind of question I know,   but maybe somebody has some experience, or any ideas

 

thanks.

 

I should mention, car has now done 80k miles ( 70k of them mine)

fuel stations are selling winter diesel now,as said by golf-fiend above, so the mpg of all diesels will start to drop this could be the issue,

520 for an egr??? Just had mine done on 2ltr tdi Octavia .... egr was about 75 quid and took less than an hour to fit ..... and mpg is about the same although mine didn't go into limp mode, just put the engine light on

your egr is at the front of the engine :thumbup: , the ops is at the rear :thumbdown:  ,

I too have seen a significant drop in MPG over the last two weeks. Winter diesel is here.

 

As it happens it's a 6mpg drop, exactly the same as yours (50mpg down to 44mpg) on my 2.0 CR140 Superb.

Having just read the thread and seen comments about winter diesel this is something ive never heard of?? do we even need it in this country? and Why don't they tell you about it??

 

I notice a change when I fill up at Asda as opposed to Costco premium but about 4-6 Mpg

 

If there is a marked difference in the fuel in winter is it also better for us to swap from normal to premium fuel to reduce the change?

 

My Octy much prefers the cold weather in terms of power but mpg does suffer when its cooler.

They don't tell you about it, because in days gone by, derv had to be winter formula or it would be wax in the pumps and your fuel tank.

All derv will be winter formula, normal or the "Oh I'm so much better than EN590 variety"

Lower temperatures, mean more air and fuel per given volume, hence the more power/lower MPG.

Also worth noting, if the EGR was solid with crud, then changing it will mean the engine can breath again, so with a full load of air it will burn a full load of fuel, rather than being strangled by carbon build up.