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Galaxy 1.9 Sudden drop in MPG

Started by Jameson78, September 06, 2022, 07:59:48 PM

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September 06, 2022, 07:59:48 PM Last Edit: September 06, 2022, 08:15:34 PM by Mirez Reason: fixed formatting
Hey all, not been on for a while and the forums looking good!!

I have a weird problem with my Galaxy 1.9 115. It's been consistently awesome returning 48/50mpg over my 24 mile run to work and back but over the last couple of months there has been a rapid decline in MPG and today I only managed 32mpg. This is coupled with a far more prominent smell from the exhaust, its not a diesel smell just a strong fumy smell but no smoke or anything like that.

The other odd thing is that I gave it a service a week ago to see if that would improve things. Whilst it didn't, when I checked the oil level today (some 300 miles since) the oil is still clean. I've owned this from new and never seen that, it normally goes black within a couple of start/stops so I guess this has something to do with it. I've also tried some injector cleaner and the old Italian turn up but nothing makes a difference and it still drives fine with plenty of power, in fact if it wasn't for the smell and lower MPG I would say nothings wrong. It gets serviced every 8k miles with the correct spec oil!

I've checked the tyre pressures are fine and used a laser thermometer after a run to check the brakes aren't binding and of course the computer says nothings wrong so now I am at a loss. Please help! :rolleyes:  :rolleyes:

I would discount an issue with oil as I find oil these days stays clean longer after changing.
What's the coolant temp reading on diagnostics also checked MAF readings while at it.
Might also be worth cleaning egr valve out in case that's partially sticking.

Yes, could the thermostat be sticking maybe, I changed mine and got more MPG as the car was always running cool
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all. Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

I may be completely wrong here, but I believe that the booster heater burns diesel. Could there be a fault somewhere in that circuit?

Booster heater does burn diesel, believe it has separate exhaust on passenger side near rear wheel.

Where are you seeing the mpg reading from? Dashboard display or by calculating based off fillups?

Unlikely to be the booster heater because those things never ruddy work and are always 'locked out' by the car's computer lol
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all. Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

Quote from: Solentview on September 09, 2022, 07:33:55 PMI may be completely wrong here, but I believe that the booster heater burns diesel. Could there be a fault somewhere in that circuit?

I doubt it as we aren't getting the temperatures to bring boost heat on yet also if car reaches normal operating temp it will be switched off.
Wouldn't be the slightest bit surprised if it is down to engine temp not getting High enough, hard to tell during warmer months when heaters aren't needed plus temp gauge is not an accurate reflection of running temp.

Try changing fuel too, I find I get the most MPG using Shell V-Power
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all. Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

Thanks. It warms up fine so I don't think it's the thermostat and i put the booster heater on a switch years ago so it's not that either.

The MPG reading is on the dash, I've not calculated it officially but having done this journey for years I'm filling up twice a month instead of once so it's certainly using more.

What am I looking for with maf and egr readings?

Don't know on the readings personally but usual advice on the Maf is unplug it and see if it improves like that