britishmeat

Hello

I have a 2001 TDi 110bhp and i seem to be losing my fuel economy. I can normally get 60mpg on my journey to work as it is quite busy roads and you can't really go over 60mph.

However i am now only getting 45-50 and i don't know why i think i have a slight loss of power as well, I disconnected my MAF and i got a complete loss of power, does that mean the MAF is ok? my fuel economy does seem to inporve when i have done about 15 miles into a journey.

I don't have VAG COM so i can't do any tests

Anybody got any ideas?

CHeers

Bill

KenONeill

I'd love to get a real 60mpg (under any circumstances other than dual cabbageway cruising at 60ish). I've seen better from the trip computer, but it reads ~10% better than tank to tank fills (same method of filling and same pump most of the time).
I think you've absolved the MAF sensor.

britishmeat

Sorry, but when you say absolved the MAF what do you mean.

I only changed the MAF about a year ago and i have done about 15-20k. Is it possible for the MAF to go again. I have been very naughty though and not had the car serviced

what do you think?

KenONeill

I mean that a loss of performance with the MAF disconnected means that it's working. But yes, it's possible to break more than one of them.

I'd think that a service would help, particularly the oil change, since well-used deisel oil loses its lubriscity, and increases viscosity, both of which increase the oil's power absorbtion.

mbames

change of air filter would certainly help too. does your turbo still work?

britishmeat

To be honest i am not sure if the turbo is working, i can't seem to feel much of a boost when hitting 1900/2000 RPM. but my performance does definatley reduce when i disconnect my MAF.

KenONeill

I don't feel a kick at those revs either, but peak torque's lower, maybe 1750rpm. I do hear the turbo going on/off just, if accelerating 1500 to 2000 ish repeatedly with the driver's window open and a wall on my right for it to bounce off.

britishmeat

I will try that then to see if i can hear the turbo kick in, i took it down to my local garage today and they put it on VAG COM but it didn't display any errors. Tried changing the MAF and that didn't help much either.

They have suggested that i try some injection cleaner and if that doesn't work then they will put it on the rolling road to see if the power is what it should be.

I am sure something is not right but i'm worried that finding the solution may be expensive.

Can anybody suggest a decent injection cleaner?

drumbold

I've got a 90bhp TDi Octavia and if I leave changing the oil too long the economy drops off - the car does seem to like clean oil.

The other thing I've found, as I only tend to potter to work etc with the car is, once up to temp drove it like you stole it for a bit - it then seems to feel better.


I used to have an old Ford Orion - same thing 55mpg every tank, then it would just drop to about 40mpg - change the oil and filter - back to 55mpg again..

britishmeat

I have tried some injection cleaner and failed with no avail.

I will now try a some new oil and a new oil filter. Does the Ocatvia have an Fuel and Oil filter that needs changing? I really need a new cambelt as well soon so i mighe get it done all at once.

Anybody know anybody good in the Peterborough Area that maybe likes "cash in hand jobs" LOL. Getting Married in May so cash is a little tight at the moment.

KenONeill

There is a fuel filter.

Also this is not what you're going to want to hear I think, but I'd get the water pump changed if the cambelt's being done anyway. Reasoning being that it's a known failure point, and takes about 10 minutes to do when replacing the cambelt, but as long to do as the cambelt if it needs doing between cambelt changes.

Stuart_J

How many miles has the car done ??

Possibly sticking vanes on the turbo, do you drive the car hard ?

__________________
Speed is an addiction for which thankfully there is no cure

britishmeat

The Car has done 117K, i do through stages where i drive the car hard , it just depends how i am feeling. Is that just something you can clean and fix or do you need to buy a new turbo?

Stuart_J

Ours died at 120,000, main symptem & one that many get was the car going into limp mode when driven very hard, ours you had to hold flat out in top for around a minuite, ours was mapped so quicker than stock but it was usually showing around 100 on the clock before going into limp mode. If you havent experienced limp mode the car looses performance very noticably, probably a max of about 70 is all you can achieve. Once you turn the ignition off & restart the car it will go back into normal mode until the next time. If the vanes are sticking it can cause excessive boost when flat out, the car senses this & puts into limp mode before it goes bang

Personally I would get it serviced first & DONT rag it if the cambelt change is over due. Turbos can be cleaned but you need someone who knows what they are doing. New Turbos are silly money !! If its fooked go down the breaker route as there are bound to be loads around. Skospares are a good place to start

__________________
Speed is an addiction for which thankfully there is no cure

britishmeat

Cheers for your advice

I am really not sure what is going wrong as my car has never been limited to speeds of just 70. When i was driving it home from work today the power seemed ok but the fuel economy was really low, it was just above 40mpg when i can normally get 60mpg, could the car needing a service affect my economy by that much? what else could possibly cause my reduced fuel economy?

Stuart_J

If the car is overdue a service then it needs doing, hopefully at the same time they can shed some light on what other problems there might be. Find a good independant. The only people I know in Peterbourough are Jabbasport, certainly cheaper & better than a main dealer but certainly not cash in hand types & you will certainly find cheaper but I doubt better. Mike who is Jabbas mapping wizzard runs a 110 tdI Octy as his daily drive so knows more than a bit about them !

Out of interest when did the car last have a proper service

__________________
Speed is an addiction for which thankfully there is no cure

mbames

air filters can cause a drop.... one of my mates with a PD passat said his dropped right off before it was serviced....

cheezemonkhai

TDI 110, at about 30k miles the fuel economy dropped approx 10mpg on average and I was scratching my head for a bit. Took out the filter that is only due for a change every 40k and it was black and caked in thick soot.

Changed it for a new genuine one (about £10-15) and everything was back to normal pretty quick. I now change them at somewhere between 10 and 20k.

Oh and if you get the cambelt done, definitely make sure they do all the tensioners as well or you might be needing a new engine.

HTH

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Cars make CO2 and trees absorb CO2. By driving your car you're feeding a tree and helping the environment.

britishmeat

Cheers for the advice,

I have had the car since Dec 05 and i have done 27k and not had it serviced yet but i did change the air filter about a year ago.

I will get the car serviced and see if that improves things, i will report back after that.

Many thanks again for everyones thoughts.

Bill

cheezemonkhai

Dirty oil will get thick and won't help things.

I would definitely get it serviced as 27k was the longest I managed between variable services.

__________________
Cars make CO2 and trees absorb CO2. By driving your car you're feeding a tree and helping the environment.

britishmeat

Update:

Got a service done, thanks to TOMVRS, great guy, cheers mate.

Economy does seem better as i managed to get 61mpg on my journey to work this morning. It still doesn't feel right tho as i had to drive like a super Grannt to achieve this, My economy seems fine when i am crusing but seems to seriously reduce when i accelerate, i know this is normal for it to reduce when accelerating but it doesn't seem or feel right.

I have recently got 4 brand new tyres, could this be affecting my economy i would assume they are at the correct PSI but i have not checked yet.

If not, what else could possibly be affecting my economy

Tom_vRS

Glad to be of service.

The air filter looked ok, but the oil was pretty manky. Pollen filter looked like it had been in there forever!

I should have my laptop back anyday... bring it over and we'll do a diagnostic scan, and check the tyre pressures, lol.

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97/R BMW 328i in Boston Green.

gcr31463

My economy has gone done since I put new "grippier" tyres on.
My average (on screen) this month is 56mpg, it used to be 60mpg.
On the plus side, it does actually feel like it's attached to the road!

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Steve Blanchard

Could also be the gasket on the vacuum pump. Even a service and cam belt change can cause the problems mentoined above!! Just done a week in N Yorkshire, felt like I was going backwards at times with no turbo. Worked fine on the way to the garage and hasn't worked since.