TD5 - Horrendous MPG
Discussion
I've recently bought a TD5 90, which seems to like a drink of the dark stuff big time. Prior to the remap (Twisted Performance) it could only manage 300 miles to a 60 litre tank cruising at 65mph. Since the remap, nothing has improved with the worst case being 240 miles cruising at 65-70mph on motorways; so no change then.
As far as I can tell, there's no diesel leaking and I've tried to be as sympathetic as possible to improve fuel economy, but so far with no success. I've put injector cleaner into the tank with no improvement.
So, any ideas? I'm sure I must be able to achieve more and am wondering if there could be a problem with the MAF sensor? One discussion with a Spanish mechanic suggested that each fuel rail had independant lobes on the cam which 'may need balancing'?
Any ideas gratefully received!
As far as I can tell, there's no diesel leaking and I've tried to be as sympathetic as possible to improve fuel economy, but so far with no success. I've put injector cleaner into the tank with no improvement.
So, any ideas? I'm sure I must be able to achieve more and am wondering if there could be a problem with the MAF sensor? One discussion with a Spanish mechanic suggested that each fuel rail had independant lobes on the cam which 'may need balancing'?
Any ideas gratefully received!
I've ruled out the tyres as they're the same size as the ATs I had on before. The MAP/MAF has been cleaned and whilst there was some sludge in the MAP it wasn't overwhelming so didn't bother with the rest of the inlet manifold, but may have to re-visit this area when I'm back in the UK.
Even driving like Miss Daisy, I can only get around 320 to the tank which works out around 24mpg. OK, achievable but it's torturous driving round like that ranging from 642m altitude to sea level!
Could there be an injector problem? I take your point about the EGR but it seems the jury's out as to whether this will affect economy reading other threads on the matter?
The brake pads have been changed to rule out binding, plus an oil change and its only done 65k on a 02 plate.
Puzzled. Thanks for the useful photo showing the MAP by the way.
Even driving like Miss Daisy, I can only get around 320 to the tank which works out around 24mpg. OK, achievable but it's torturous driving round like that ranging from 642m altitude to sea level!
Could there be an injector problem? I take your point about the EGR but it seems the jury's out as to whether this will affect economy reading other threads on the matter?
The brake pads have been changed to rule out binding, plus an oil change and its only done 65k on a 02 plate.
Puzzled. Thanks for the useful photo showing the MAP by the way.
fesuvious said:
Oh, may I ask you a question:
At your '65-70mph on motorways' what revs is your 90 sitting at?
Unfortunaely, it doesn't have a thrashometer and my backside isn't calibrated accurately enough for RPM.At your '65-70mph on motorways' what revs is your 90 sitting at?
Thanks as ever for the replies people. Looks as if the EGR will have to wait for my return to the UK which is a bummer as I could have done with the improved fuel economy on the way back.
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