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2003 2.0 HDI Poor fuel consumption
#21
Fully agree that any pure cleaner will do the job on the filaments and the thermistor but you have to consider the effect on the plastic housing. Do the active ingredients melt plastic? Not sure that all brake cleaners are cleared for use on plastic housings but, you pays your money and you takes your choice.
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#22
Update.  Did a long run this weekend.  No coughs, no misfires and got 42 mpg.  Thanks to all.
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#23
(30-01-2019, 10:18 AM)Norfolkboy Wrote:  Fully agree that any pure cleaner will do the job on the filaments and the thermistor but you have to consider the effect on the plastic housing.  Do the active ingredients melt plastic?  Not sure that all brake cleaners are cleared for use on plastic housings but, you pays your money and you takes your choice.

I’ve never used a brake cleaner that damaged plastic, maybe I’ve just been lucky, even if you get acetone on abs it will soften it, but as long as you don’t touch the surface it will remain in tact and the correct shape... but car parts are designed to be safe with petrochemical substances which is what all brake cleaners are I’ve ever used
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#24
I just got 38MPG out of my 2.0 HDI. Mixture of around town driving and some longish 100 mile motorway runs. Slightly skewed by idling for 20 minutes or so 2 or 3 times when I was out camping in her and it was bloody freezing!

I may try a MAF clean to see if I can get a few more mpg, I was hoping for mid-40s.
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#25
For what its worth (is that fwiw in internet speak?) the 2.0 90 BHP does not have intercooler.
BTW (yes I know this one). I normally get 600 miles to a tank of diesel. But that is little traffic idling.
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#26
IIRC Wink my 2.0 averaged somewhere about 42 or 43 MPG according to the trip computer with or without the MAF, but I read somewhere that the trip computers are a bit optimistic.
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#27
(06-02-2019, 11:04 PM)LukeLog Wrote:  I just got 38MPG out of my 2.0 HDI. Mixture of around town driving and some longish 100 mile motorway runs. Slightly skewed by idling for 20 minutes or so 2 or 3 times when I was out camping in her and it was bloody freezing!

I may try a MAF clean to see if I can get a few more mpg, I was hoping for mid-40s.

Cleaning the MAF will not improve your MPG, it's either working or it's not. You'll know if it's not working as the car will not rev out or pull cleanly. I had no success cleaning mine and had to replace it at a cost of about £35 I think it was. Well worth it to have the performance back but it worked well just disconnecting it as a stop gap.
So where does this bit go then ?
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#28
(10-02-2019, 09:16 AM)ffrenchie Wrote:  
(06-02-2019, 11:04 PM)LukeLog Wrote:  I just got 38MPG out of my 2.0 HDI. Mixture of around town driving and some longish 100 mile motorway runs. Slightly skewed by idling for 20 minutes or so 2 or 3 times when I was out camping in her and it was bloody freezing!

I may try a MAF clean to see if I can get a few more mpg, I was hoping for mid-40s.

Cleaning the MAF will not improve your MPG, it's either working or it's not. You'll know if it's not working as the car will not rev out or pull cleanly. I had no success cleaning mine and had to replace it at a cost of about £35 I think it was. Well worth it to have the performance back but it worked well just disconnecting it as a stop gap.



Ah ok, well it seems to run just fine. It's my first diesel but it pulls well enough, gutless after about 3800rpm but I'm guessing that's when the turbo is starting to run out of puff anyway.

Will perhaps unplug the MAF today and just see how it feels. Will have to look elsewhere for MPG improvements!
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#29
(10-02-2019, 09:16 AM)ffrenchie Wrote:  
(06-02-2019, 11:04 PM)LukeLog Wrote:  I just got 38MPG out of my 2.0 HDI. Mixture of around town driving and some longish 100 mile motorway runs. Slightly skewed by idling for 20 minutes or so 2 or 3 times when I was out camping in her and it was bloody freezing!

I may try a MAF clean to see if I can get a few more mpg, I was hoping for mid-40s.

Cleaning the MAF will not improve your MPG, it's either working or it's not. You'll know if it's not working as the car will not rev out or pull cleanly. I had no success cleaning mine and had to replace it at a cost of about £35 I think it was. Well worth it to have the performance back but it worked well just disconnecting it as a stop gap.
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#30
Beg to differ on the working or not.  Cleaning improved my fuel consumption and cured the hesitation, misfire/cutout.  On the other hand, if the MAF has failed, either by broken heating wires or a falied thermistor, no amount of cleaning will save it.   Contamination on the wires will insulate them, reducing the heating effect, contamination on the thermistor will reduce its sensitivity.  No way of telling which will work, cleaning or replacement unless tried. Agree on the diconnect the MAF disconnect first though, confirms where the problem is.  You pays your money and you takes your choice.
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