Fuel consumption- Golf GTTDi PDI

[MoVW]

:mad: Hi everybody

I wonder if anyone can help:

I just done service from non VW garage, changed oil, fuel and air filter, plus changed rear brake pads.
Since servising I am getting 9 mile per galon less then it was before.
Any suggestion what might be wrong ?

Thank you

MoVW

[Eshrules]

:mad: Hi everybody

I wonder if anyone can help:

I just done service from non VW garage, changed oil, fuel and air filter, plus changed rear brake pads.
Since servising I am getting 9 mile per galon less then it was before.
Any suggestion what might be wrong ?

Thank you

MoVW

you say you used a non vw garage, what kind of garage was it? a specialist indpendant, generic independant, back street grease monkey....?

also, what parts did they put on, if they have used cheap components, there is a chance it could be running more fuel. a techie may be able to explain this better. this is my major concern when trying to cut costs, you often pay for it in the long run..... :(

[MoVW]

you say you used a non vw garage, what kind of garage was it? a specialist indpendant, generic independant, back street grease monkey....?

also, what parts did they put on, if they have used cheap components, there is a chance it could be running more fuel. a techie may be able to explain this better. this is my major concern when trying to cut costs, you often pay for it in the long run..... :(


Thanx for this quick reply
I took it to independent garage and I bought myself the parts from Euro Car Parts in Wembley, so they just fitted it.
I used Chevron 10w-40 Turbo diesel oil, VW specification 505.00

Thank you

MoVW

[Eshrules]

Thanx for this quick reply
I took it to independent garage and I bought myself the parts from Euro Car Parts in Wembley, so they just fitted it.
I used Chevron 10w-40 Turbo diesel oil, VW specification 505.00

Thank you

MoVW


the 10w 40 oil you got, am i right in thinking it is a multigrade oil? not a specific vw spec oil?

[devonutopia]

That's the WRONG oil for a PD engine (any decent supplier of oil should know about PD Vs the non PD TDI engines found in older cars.....)

Get some 505.01 in there right away! (5w 40)

It needs to not just be VW approved, but also approved for PD engines. I would not drive that car anywhere except somewhere to get the oil changed. The filter should be OK, but give it a thorough draining off, and get some PD stuff in there.

[Eshrules]

That's the WRONG oil for a PD engine (any decent supplier of oil should know about PD Vs the non PD TDI engines found in older cars.....)

Get some 505.01 in there right away! (5w 40)

It needs to not just be VW approved, but also approved for PD engines. I would not drive that car anywhere except somewhere to get the oil changed. The filter should be OK, but give it a thorough draining off, and get some PD stuff in there.

that's what i was thinking, i just had a quick look for the brand he used, i cant say ive heard of them... not necessarily a bad thing, but the oil that has been used appears to be a multigrade oil :aargh4:

[devonutopia]

It could be a worse oil - Heard of Chevron and at least that grade of oil won't do anything totally disastrous. It will if it's left in there too long, having already manifested itself in 9mpg worse economy. not sure what the 10w / 5w actually means - But the 10w stuff is obviously twice as "something" than the 5w, which perhaps isn't good....

[Teutonic_Tamer]

Gentlemen, may I point you towards the "Oil Labeling" sticky:

http://www.vwaudiforum.co.uk/forum/showthread.php?t=1482
With particular regard to post #12.

Also have a shufty at the "Engine Oil Bible" http://www.chris-longhurst.com/carbibles/engineoil_bible.html, though be cautious, as this is written with a US slant!

Any more oil "Q"s - I'll try and answer them.

Rgds

[Teutonic_Tamer]

the 10w 40 oil you got, am i right in thinking it is a multigrade oil? not a specific vw spec oil?


that's what i was thinking, i just had a quick look for the brand he used, i cant say ive heard of them... not necessarily a bad thing, but the oil that has been used appears to be a multigrade oil :aargh4:

Any oil with two "sets" of numbers, such as 0w30, 5w30, 5w40, 10w40, etc is technically classed as a multigrade. Monogrades just have a single number - eg 30.

The Chevron 10w-40 Turbo diesel oil, VW specification 505.00 - is OK - for tractors, but certainly not PD diesels.

BTW, a starter for 10, who actually invented the diesel unit injector? (PS, not VAG)

Rgds

[devonutopia]

BTW, a starter for 10, who actually invented the diesel unit injector? (PS, not VAG)



Umm, Herbert Akroyd Stuart :D I think. Google is my friend. :o

[Teutonic_Tamer]

Umm, Herbert Akroyd Stuart :D I think. Google is my friend. :o

Double ummm, I need to go back to the drawing board for this one. Just to clarify, my meaning of "unit injector" technology refers to fuel injectors fed by a common rail, and operated by the engine crankshaft, rather than any separate diesel injector pump!

EDIT: well, I'm ashamed I'd never heard of Herbet Akroyd Stuart, who seems to be credited with the invention or the oil burning engine, rather than the German Rudolf Diesel, however, in my meagre defence, all his papers were destroyed on his death!

TIP OF THE DAY (take from the UK Gov't HPA web-site)
The use of diesel to clean skin and hair should be strongly discouraged as this practice has been known to cause serious kidney damage.

Well I never ! ! ! ;) ;) :D

[Eshrules]

Double ummm, I need to go back to the drawing board for this one. Just to clarify, my meaning of "unit injector" technology refers to fuel injectors fed by a common rail, and operated by the engine crankshaft, rather than any separate diesel injector pump!

EDIT: well, I'm ashamed I'd never heard of Herbet Akroyd Stuart, who seems to be credited with the invention or the oil burning engine, rather than the German Rudolf Diesel, however, in my meagre defence, all his papers were destroyed on his death!

TIP OF THE DAY (take from the UK Gov't HPA web-site)
The use of diesel to clean skin and hair should be strongly discouraged as this practice has been known to cause serious kidney damage.

Well I never ! ! ! ;) ;) :D

am i right in my thinking that fiat invented this? :o

[Teutonic_Tamer]

am i right in my thinking that fiat invented this? :o

No, they may have common rail, but not unit injector!

Try a Google for Cummins+V903 ;)

[Eshrules]

No, they may have common rail, but not unit injector!

Try a Google for Cummins+V903 ;).


LOL im confused :smashfrea

[Teutonic_Tamer]

LOL im confused :smashfrea

Righty, to the best of my knowledge, the unit injector was invented and/or first used in the Cummins V903 commercial engine. Now my memory is quite rusty on the detail, but they were a V8 diesel, with a capacity of 903 cubic inches, which was I think 14.7 litres. It used cylinder direct injection, fuel fed from a common rail, and the injectors were directly operated by the camshafts. The injectors were obviously quite crude compared to the VAG PD piezo unit injectors, and when stripped down, the internals looked just like a 6" nail.

The Cummins V903, from an American company, came in both normally aspirated, and also turbocharged, and, in the UK, was frequently found in large, 2 or 3 axle fire fighting vehicles! Power was transmitted through a fluid flywheel, into a pre-select semi-automatic gearbox (similar to the DSG!!!), then to a transfer box with power take off, to either rear wheel drive, all wheel drive, no wheel drive (for fire fighting pump), or any possible combination with the fire pump engaged!

[MoVW]

Thanks Jason.

In fact thanks to all of you that have responded to my post.

So....i've now changed the oil and put the proper 505.01 spec oil into my engine. i also changed the oil filter. i'm getting better fuel consumption now but my car just doesn't seem as powerful/as fast as it was before.

What could bethe problem? could i have damaged the engine, or something alse during the time the 10w-40 oil was in my engine?

Any advice or suggestions would be appreciated.

MoVW


That's the WRONG oil for a PD engine (any decent supplier of oil should know about PD Vs the non PD TDI engines found in older cars.....)

Get some 505.01 in there right away! (5w 40)

It needs to not just be VW approved, but also approved for PD engines. I would not drive that car anywhere except somewhere to get the oil changed. The filter should be OK, but give it a thorough draining off, and get some PD stuff in there.

[Eshrules]

Thanks Jason.

In fact thanks to all of you that have responded to my post.

So....i've now changed the oil and put the proper 505.01 spec oil into my engine. i also changed the oil filter. i'm getting better fuel consumption now but my car just doesn't seem as powerful/as fast as it was before.

What could bethe problem? could i have damaged the engine, or something alse during the time the 10w-40 oil was in my engine?

Any advice or suggestions would be appreciated.

MoVW

how many miles did you drive the car for before the oil was changed from the 10w40 to the 505.01 spec oil?

[Teutonic_Tamer]

The worse fuel consumption could actually be nothing more sinister than the usual seasonal variations, including the addition of winter anti-waxing agents to the diesel.

[Teutonic_Tamer]

So....i've now changed the oil and put the proper 505.01 spec oil into my engine. i also changed the oil filter. i'm getting better fuel consumption now but my car just doesn't seem as powerful/as fast as it was before.

What could bethe problem? could i have damaged the engine, or something alse during the time the 10w-40 oil was in my engine?

As eshrules asked, how many miles did you run on the duff oil??

Regarding the poor performance, being as the original garage who seviced it displayed muppetry regarding the oil requirements, maybe muppetry affected the rest of their work.

Did any seals, or the filter itself, get jambed when the fuel filter was changed. Was the correct spec fuel filter fitted (doubtful, going on their track record).

What about the air filter - correct one? Did they forget to clear the dead mouse/birds from the intake pipes?

Rear pads - see the kind of questions, were they the correct spec pad. was the piston wound back fully, is the handbrake cable too tight. After a short run of 5 miles, say, do the rear wheels feel hotter than the fronts? CAUTION - TAKE CARE, THE WHEELS AND BRAKES CAN GET MIGHTY HOT, AND BURN YOU!

Get back with some answers!

HTH, rgds

[meirionr]

In my very humble opinion, a loss of power combined with an increase in MPG, can often be caused by a basly connected or leaking boost hose. Check all these as a first and listen for any additional whistling from under the bonnet under acceleration.

I had this on a modified VRS (went from 185 to about 100BHP and a group N Integrale that went from 265 to about 12BHP and even more outrageous MPG)

Hope this helps and I hope its not serious.

Regards

Rossi

[Teutonic_Tamer]

In my very humble opinion, a loss of power combined with an increase in MPG, can often be caused by a basly connected or leaking boost hose. Check all these as a first and listen for any additional whistling from under the bonnet under acceleration.

I had this on a modified VRS (went from 185 to about 100BHP and a group N Integrale that went from 265 to about 12BHP and even more outrageous MPG)

Hope this helps and I hope its not serious.

All very valid and worthwhile points, oh, and welcome to the forum. :beerchug: