Bad fuel economy - reasons?

[azzacalabaza]

Hi guys. Any advice will be appreciated.

I've recently purchased a 2009 MY08 ST Patrol with 120k on the odometer.

I've done a test on fuel efficiency for town driving only and got 16.6L/100 (17MPG)

I was expecting to get around 13L/100 so makes me believe there could be an issue somewhere.

The vehicle is stock standard with no accessories using standard size road tyres. I gave it an oil change as soon as I got it home and replaced oil and air filters.

I have driving it around trying to save on fuel, so no heavy foot and still got the poor results.

I have been driving around with the O/D on which was stated in the manual. Not sure if this would help town driving if it were switched off.

I have used a fuel conditioner on each fill up.

After a highway trip it returned nearly 14L/100.

Is there anything I could do/ or check to help improve efficiency? Could the EGR valve not be functioning properly and affecting economy?

Kind regards,


Aaron.

[azzacalabaza]

20160927_081344.jpg
This is an image of oil around turbo. Could this be the issue?

[the evil twin]

Clean the MAF sensor and disconnect the Battery for 30 minutes to force the ECU to 'relearn' the settings and see how that goes.

[azzacalabaza]

Clean the MAF sensor and disconnect the Battery for 30 minutes to force the ECU to 'relearn' the settings and see how that goes.

Thanks. Just bought some MAF sensor cleaner. Will give it a go and clean out intercooler an see how that goes.

[threedogs]

a catch can should keep your IC cleaner but if its oily to look at,,chances are its leaking.
Nothing you can do about it except buy a fully tigged replacement

[Maxhead]

Being a CRD, drive it like you stole it...lol These motors love revs and perform best in high RPM range. I hit 4000RPM every gear change
With that oil leak, just clean it and tighten the clamp...should sort that out

[azzacalabaza]

a catch can should keep your IC cleaner but if its oily to look at,,chances are its leaking.
Nothing you can do about it except buy a fully tigged replacement

I'm not sure yet if the intercooler is oily. I have yet to remove it and inspect. I will order the plate and scangauge II so will probably do it then. For now I'll try cleaning MAF sensor as suggested.

Anyone have an easy to follow guide on doing that?

[the evil twin]

You need the appropriate Torx bit to fit the sensor retaining screws.
Pull the sensor out and spray the ports liberally with cleaner
Allow to dry and refit

[BigRAWesty]

Your cooler will be oily inside. What Threedogs is saying is that stock coolers leak around the pressed ends.
You sometimes can see oil patches on the fins when they are a bit dusty.

Give the maf a clean as above.
But autos will always use more fuel than a manual.
I get 13-14L/100k on the highway so if your getting 16 around town I'd say that's a good average..

[threedogs]

Its straight forward as ET says dont over think it
just spray over a white tissue or cloth.
Not sure on the size of the torx tool required
its either a number 2 or a 20,,,,anyone,,,
Make sure its dry before installing it again