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  1. Golf mk4 2.0 gti running rich 
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    My golf 2.0 gti mk4 has gradually been using more fuel.i am currently getting approx 18mpg.there is excessive black smoke and petrol fumes from exhaust.the idle is also not good.when the car is ticking over the fuel computer displays 15mpg when it used to be at zero.should i start with the lambda sensor? Any suggestions will be helpful.
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  2. Re: Golf mk4 2.0 gti running rich 
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    No you should start with a fault code read. The three most common cause of this problem on your engine are the lambda sensor, the Air Mass Meter or the coolant temperature sensor but you will have no idea where to start without a code read.
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  3. Re: Golf mk4 2.0 gti running rich 
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    O.K ,will get check.Should I be getting any fault light on?
     
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  4. Re: Golf mk4 2.0 gti running rich 
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    It depends on the year and engine type code.
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

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  5. Re: Golf mk4 2.0 gti running rich 
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    I didn't have the smoke issue but when I bought my 2.0 gti I first changed the fuel filter and air filter and cleaned the MAF sensor with contact cleaner from maplin. Got an instant jump in MPG. crusing on the motorway 60/70 was giving me 35ish and local journeys mid 20's to 30. Then with the cold recently I have have sludge build up in the oil breather. Due to the icy weather and short journeys not burning off the condensation in the engine its dropped again. So as I replace gaskets 1 by 1 to try and solve the air gap I keep cleaning out the breather pipes coming from the rocker and to air filter pipe and cleaning the MAF sensor at the same time. My car bubbles at just under 800 rpm on iddle...not sure if that's right. Also check your spark plugs, they may give you a good indication of oil buring / rich fuel so on.....
     
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  6. Re: Golf mk4 2.0 gti running rich 
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    sounds as though we have same problems.my car also does short journeys and i also get a bit of the old sludge.i replaced the lambda sensor yesterday and it seems to have cured fault.the thing that bothers me though is if something else is wrong.my fuel computer showed better mpg straight away but it wont zero.does yours zero when u let off throttle?mine reads 5mpg at idle but when stopping just stays at last reading.i was thinking of cleaning maf,is it straight forward?
     
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  7. Re: Golf mk4 2.0 gti running rich 
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    What was the result of the fault code scan?


    Considering selling my VCDS KEY-USB interface. If you're interested please contact me via PM or email.
     
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  8. Re: Golf mk4 2.0 gti running rich 
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    Quote Originally Posted by VW NORTON View Post
    sounds as though we have same problems.my car also does short journeys and i also get a bit of the old sludge.i replaced the lambda sensor yesterday and it seems to have cured fault.the thing that bothers me though is if something else is wrong.my fuel computer showed better mpg straight away but it wont zero.does yours zero when u let off throttle?mine reads 5mpg at idle but when stopping just stays at last reading.i was thinking of cleaning maf,is it straight forward?
    I was thinking about doing the lamda as well, seemed awkward to change form above, did you jack it up and go underneath?? Is it fairly straight forward and how much is a replacement?

    Since replacing my oil breather assembley attached to the rocker and cleaninf all pipes and MAF again. Car runs great but the trip is saying poor MPG, even though the state of the issue is alot better! another check of pipes and so on tom I think.

    The trip says random MPG numbers everytime I stop. But the average drops like a bomb now when I am at a standstill, its like countdown!

    The MAF is very simple to clean and take out. You don't take it out itself but in the housing its in which connects to the air filter and air pipe. Solid plastic, just take it out, clip one side and 2 phillips screws the other, unplug the connector first. Hold it and spray lightly both ends from distance the sensor is side and let it dry before replacing. I use SERVISOL super 10 - switch cleaning lubricant, from maplin. Its less than £6.
     
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  9. Re: Golf mk4 2.0 gti running rich 
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    Cleaned maf a couple of days ago,it didnt look dirty but was well worth it.I can not believe how much more power the car has now,i cant remember it ever running as well! Anyway,had fault read on it today and looks like the other 02 sensor needs doing now,this is the one that is after the cat.Cost me £40,gonna fit it on monday.I would definitly recommend fitting the sensor yourself if your half decent with your hands.I did buy the pucker tool for getting it out,it cost me £9 and was worth every penny cos it loosened it easily.Its a bit tight but only seems possible to attack it from above but get some ramps cos the sensor plug is located underneath car in line with the cat.
     
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  10. Re: Golf mk4 2.0 gti running rich 
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    Glad the MAF sensor clean went well! and successfull. After another full clean and positive running results. Car is struggling to climb over 20mpg without really touching the pedal! Very fustrating. I don't have the money to changet the Lambda sensor unless it's defo the problem so I guess my next plan of action is to find a nice person somewhere in Surrey with a VAG com to help me out to see what's going wrong. Or a cheap VW specialist close to Gatwick area.........

    Wondering if the MAF has gone now possibly as well.....Love the car but too many sleepless nights since buying it from a cheeky garage who stiched me right up with too many problems!
     
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