GolfGTIforum.co.uk
Model specific boards => Golf mk2 => Topic started by: messenjah on 17 January 2011, 13:19
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hi guys some issues with my gti im getting 13 mpgfrom a standard 8vdigi
today im gonna swap the afm because adjusting themixture screw does NOTHING
recentlychanged the blue temp sensor for a genuine vag one gonna check the timing and put some injector cleaner through it
what else
should i look at ?
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is there a screwdriver through the fuel tank!? Would be worth a good nose around for leaks...
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where are you getting these figures from? If its the MFA I wouldn't trust it... work it out properly.. hows it running?
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Are you sure the screw is actually in? i.e. has the thread caught properly or is it just loose over the hole?
Also test the AFM by testing the resistance through it before you condemn it. I can't remember the exact reading range it needs to be, but it will tell you in Haynes. Think it's in the mid 20's somewhere..
Digis are fickle and need everything working and setting correctly and accurately to work properly (e.g. CO at 1.5-1.8, Timing 6deg BTDC @ 2-2.5k rpm).
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there are no leaks yes the reading is coming from the mfa but i used £30 of petrol on a 100 mile trip last night which puts it at about 15 mpg roughly ...
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Thats an 8V @ 15MPG something is big time wrong!
I think its time to let a pro check your timming on it :lipsrsealed:
If you have a sensor go down on your digi it will eat up 25% more fuel as the mapps are generic so possibly you will need to start testing or swapping out parts all electrical related to see if it helps?
Does it idle or drive rough? Smell any fuel from the vents?
The last time I saw figures like that was when the ECU was playing silly buggers :undecided:
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idle is a little lumpy and there is a intermittant miss fire on light throttle
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Is the engine running at the right temp? The needle should be in the middle of the gauge, if the engine temp is low the blue sender will tell the ecu to keep the mixture enriched. If your temp is low then change the stat for a genuine one. Short journeys will also kill mpg.
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temp only ever reads 1/4 of the gauge so i guess that could be part of the problem ill change the stat
im having trouble finding an afm and dont have a multimeter to check the resistance
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i had mpg figures like that on my mfa when i had the cam sprocket on the wrong way round on my 8v
the cam belt sitting a few mm over the front edge of the sprocket was the main giveaway that something was wrong
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when you say the screw does nothing, did you have the digi in setup mode while you were playing with it?
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temp only ever reads 1/4 of the gauge so i guess that could be part of the problem ill change the stat
im having trouble finding an afm and dont have a multimeter to check the resistance
The temp gauge often reads low, there is a seperate sender for it, thats not connected to the ECU. Both the blue (ECU) and black (gauge) senders can be bought from VW for not much money, and are a safer bet than non genuine ones. Get a couple of sealing rings with them too, or you may get a poor seal in the coolant housing.
May be worth getting a wee multimeter, they aint to expensive either....
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sorry, you have a good blue one already. Did you re tune it when you fitted this? Running through the tuning guide in the maintinance section would be a cheap place to start.