VW Passat MPG issue

s0ck · 3 Jan 2007 at 20:55

Baron_Samedi said:
For some strange reason they *do* make a 105ps version in the old 1.9 engine.

Have you driven one?
They certainly don't feel like only 105ps

arfur · 3 Jan 2007 at 22:16

s0ck said:
Have you driven one?
They certainly don't feel like only 105ps

agreed the torques quiet good,

I've stuck hald a tank of bio in tonight and I'll see how it goes, it did the job with my old golf, cleaned all the injectors out....and its quiets but smells of snickers

arfur · 8 Feb 2007 at 12:15

Ok, the problem is still here, I've tried different garage fuel but it hasnt made any difference.

Its been to VW again and they cant see any error codes and the emissions are .54 , the legal limit is 3.00

Urban I'm getting about 34 MPG which is ok, but motorway work is 39-41 mpg at a steady pace not club footing it.

what a friend has suggested is maybe the car is ok the fuel sensor is faulty and could be under reading and so working out that more fuel has been used than it has. I have 3/4 tank left which is 50 litres so I'll try and stick another 25 in as it hasa 75 litre tank and see if I can or not.

any other ideas?

Stonedofmoo · 8 Feb 2007 at 12:16

Handbrake sticking and not releasing the rear brake(s)

Barry Smalley · 8 Feb 2007 at 12:19

Try and reset your ECU. Unplug the battery overnight, then see how it gets on after that.

Baron_Samedi · 8 Feb 2007 at 12:21

If you do that and I don't see why you should, remember where your radio code is kept!

blueboy2001 · 8 Feb 2007 at 12:27

I've not noticed any significant increase in consumption due to the colder weather or winter diesel on my Mondeo ST TDCi.

The new Passat is a very heavy car, and you've got the lowest powered engine which won't help. What sort of average speeds are you getting, and what sort of speeds do you cruise at on the motorway?

Trip computers vary wildly in accuracy - brim the tank, run it for a couple of hundred miles, then brim it to the same level again. Work out your consumption manually and see what it comes back as.

Cyrus · 8 Feb 2007 at 12:27

sounds to me like the maf is on the way out did vw check that?

arfur · 8 Feb 2007 at 15:06

whats a MAF?

usually cruise between 60 - 70 most days, no heavy accelerating

Baron_Samedi · 8 Feb 2007 at 15:12

Faulty MAF's usually trigger a CEL (Check Engine Light) and would have shown up on the dealers test equipment... plus engine power would be way down.

Phal · 8 Feb 2007 at 15:13

If the MAF was the cause of the extra fuel useage then Id expect a lot more smoke coming from your exhaust :/

v0n · 8 Feb 2007 at 15:16

Not neccessarily. MAF doesn't have to be completely shot, it might be just malfunctioning, you will get effects like those of dirty or blocked system...

Stonedofmoo · 8 Feb 2007 at 15:48

My suggestion seems to have been ignored and yet it actually fits the symptons...

Baron_Samedi · 8 Feb 2007 at 15:52

Certainly worth checking whether the rear pads are fouling the brake calipers somehow... but this shouldn't be an issue on a vehicle as new as this.

blueboy2001 · 8 Feb 2007 at 18:08

New Passat has an electronic handbrake, and if the rear brakes were binding to such an extent as to reduce the MPG significantly they would be extremely hot after a long journey.

Stonedofmoo · 8 Feb 2007 at 18:11

Yes and in my experience brakes that are hot from binding brake even harder

Certainly worth checking, easily done too. Simply feel the wheel and if its damn hot you know where the problem is

arfur · 8 Feb 2007 at 18:40

Stonedofmoo said:
Handbrake sticking and not releasing the rear brake(s)

nope, got them to check this today, they jacked it up with handbreak off and the wheels turned freely... electronic hand break is a pain in snow... no handbreak turns allowed

anyway, the oil light came on last night, I dont think its linked but I need to top it up, I asked why it had come on with only 7000 miles from new and yet its suppose to be on a long life service, VW say it will use 1 litre every 600 miles or so and only holds 4.xx litres... sounds crap to me...

Stonedofmoo · 8 Feb 2007 at 19:22

That can't be right surely :confused:

I've never owned a car that burns oil. Even the 306DT only loses about half a litre every 6000 miles and thats an engine with 166k miles on it!

OllyM · 8 Feb 2007 at 19:44

It is right, it's how VAG TDI engines work.

They can go (up to) 30,000 miles between oil changes.

arfur · 8 Feb 2007 at 20:03

OllyM said:
It is right, it's how VAG TDI engines work.

They can go (up to) 30,000 miles between oil changes.

but with top ups I take it?