GolfGTIforum.co.uk
Model specific boards => Golf mk4 => Golf mk4 TDI => Topic started by: gazd101 on 31 January 2007, 19:24
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hi guys wondering if you could give some advice
my mpg figures on my 115 gt tdi have fallen from 50 ish to nearer 42 im wondering if there is a way to check with vag com if it is overfueling
iv tried looking at my maf and its giving readings which are higher than wot is required is this a sign that my maf is broken or could it be something else?
cheers guys
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I have been led to believe that its normal for the economy to drop off at this time of year compared with summer. Mine has done much the same.
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really i cant say iv ever noticed the problem before and iv had this car for about three years.
confussed by my MAF readings to cant understand why the figures im getting are higher than whats required does any one know if these figures look about right?
thinking of just putting another MAF sensor on and seeing how the figures compare
Engine speed MAF (specified) MAF (actual) EGR duty cycle
1512 730 681.1 4.8 4th gear
1449 250 494.9 4.8
1344 255 343 52.6
1239 715 509.6 19.9
1050 250 494.9 50.2
1575 745 607.6 4.8
1659 850 779.1 4.8
1764 700 857.5 4.8
1827 620 632.1 52.2
1848 540 529.2 47.4
1848 615 681.1 39
1848 620 592.9 45.8
1911 535 524.3 49.8
2016 850 1082.9 4.8
2163 850 872.2 4.8
2331 850 911.4 4.8
2499 850 960.4 4.8
2646 850 965.3 4.8
2793 850 970.2 4.8
2919 850 935.9 4.8
3045 850 940.8 4.8
3192 850 921.2 4.8
2583 850 1029 4.8 5th gear
2646 850 886.9 4.8
2730 850 926.1 4.8
2583 250 656.6 4.8
2310 850 852.6 4.8
2352 850 784 4.8
2352 615 666.4 60.2
2310 240 543.9 4.8
2268 240 534.1 4.8
2226 240 539 4.8
2142 240 543.9 4.8
2016 240 529.2 4.8
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I have been led to believe that its normal for the economy to drop off at this time of year compared with summer. Mine has done much the same.
Yeah, isn't it something to do with the cooler tempreatures having an effect on the density of the fuel? Most systems (including petrol pumps, so I'm told) measure volume as opposed to density.. which has a net result of a system despensing more fuel.
This might be complete rubbish, but let's discuss! :laugh:
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well thats certainly a possibility as strange as it sounds
thanks for the help guys
p.s does anyone no if the free version of vac com is capable or reading fault codes or do i need to buy the registered version?
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I think the free version will read the fault codes. Whether you can clear them or not is another thing.
I'm sure a bit of delving into the Rosstech site will tell you for sure.
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I think the free version will read the fault codes. Whether you can clear them or not is another thing.
I'm sure a bit of delving into the Rosstech site will tell you for sure.
only a similar note, anyone point us in the direction of a cheap cable that works, i bought a USB one from fleaBay and its sh1t, it only works with half the stuff in vag com
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Just wondering what is vac com.
I don't really seem to get the mpg most talk about what's the best way to test if all okay.
Will a motorway run at a certain mph let me know if i am getting the right mpg.
Cheers
Tim.
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Just wondering what is vac com.
I don't really seem to get the mpg most talk about what's the best way to test if all okay.
Will a motorway run at a certain mph let me know if i am getting the right mpg.
Cheers
Tim.
VAG Com is the name of a piece of software that emulates the Volkswagen diagnostic hardware.
if lets you do certain tests on the ECU, turn stuff on and off eg passenger air bag, check for faults etc
in terms of mpg, if find it varies depending on the weather and the trip as going uphill is going to use more than going down hill.
Personally i'm happy if i get 485 from a tank, but this figure is going to vary depending on what your journeys are like and how fast you drive.
What i do, i reset the 2 trip counter, when i fill up, that way i can see exactly how far i got from that tank, most i've seen is 517, but i'm sure some of the guys with 115 & 130's will have seen more.
What sort of mpg you getting at the moment?
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Cheers for the replies
Not sure on the mpg , i have not tested it properly yet. Me and the Mrs have have only been doing about 3-4 miles and back and forward from Tesco and her mums house so i suppose it can't quite get going.It goes upto between 30 - 40 by about 2-3 miles is that about right.
Also i have a 3 week old baby and we have been putting her in the back because of the airbags but we can't see her. How can i turn the air bag offs I thought they have switches , not mine that i can find anyway.
Cheers
Tim.
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doing short journeys never does a car's MPG any good. depending on the traffic the figures you've quoted sound about right. From where i live into town is about 2 miles and the trip computer will show around the 40mpg by driving like a granny. Winter temperatures definietly seems to have an adverse effect.
I believe the MKIV didn't come with de-activation switches for the airbags so it's either get hold of VAG COM through someone who has it and you can buy a couple of beers or take it to the stealers.............the obvious problem with deactivation is when an adult is sat in the front and the worst happens then the air bag won't deploy.......... :sad:
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Cheers mate.
The baby will always probably be in the front so hopefully that should not be a problem.
Can i buy vag com myself and do it. If so where is the best place to buy it from. Will the ebay job do the trick or do i need a proper one.
Cheers
Tim.
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think you need the full version mate.
Check out www.rosstech.com for more details as these are the guys who sell it.. Think its circa £200 :undecided:
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regarding the cable, some of the ebay ones work, some only work with certain versions.
one of the lads that has a working lead, can probably point in the right direction regarding that.
obviously you'll also need either a lap top or a pc with a really long lead to use the cable with.
i think the air bag switch was an option, that if you had it sat in the small hole, next to the service manual in the glove box.