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Model specific boards => Golf mk3 => Topic started by: Jasikasisback on 14 January 2013, 14:06
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Hi I was just wondering what I can do on my own to remedy this. My friend used his vag on the car and there are no faults that came up. Still the car is running rich...:(
I was wondering if there is any way I can adjust the mixture myself to at least improve the fule economy.
I have replaced the dizzy, leads, plugs (all recently) and the injection flange mount (earlier last year).
Still running rich.....
I suppose the only way is to take it to the garage and let them adjust it???(wonder what that will cost me...:()
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Would help if you said what car/engine combo it was ...
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Which engine code? What is "too rich"....
VAG COM log files??
Running rich can be due to a few things.....
First check if temperature for coolant makes sense (i.e. compare ECU VAGCOM read out with dash).....
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How do you know it's running rich?
Could be crap injector/injectors.
Start it up, rev it then turn off while revs are up and see if you got a wet plug.
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aam 1.8. i believe it is running rich because cutting out on startup and almost failed emisiions on last mot. now fuel economy has reduced by about 2l/100km.
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start from the beginning then....
didn't you have some issue with it a while ago? can't remember details....
2l/100km does not need automatically its running rich...
how does it run otherwise??
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this car used to do 6.8l/100km on a motirway run on average. it now does over 8 or 9 on average.
i have changed rocker cover gasket, gearbox oil (auto) tranny filter, ignition coil, spark plugs, dizzy cap, rotor arm and ht leads, timing belt, tensioner, water pump, alternator belt, mid exhaust and back box. i changed the injection flange mount
as well. and engine mounts and some breasther and vacuum hoses
before i touched the car had good fuel economy as mentioned above. now is crap.
if i had just continued to drive it but no wanted it looked after.
took for mot and they said that running too rich fuel air ratio not good grtting too much fuel. byt they dont do repairs
vagcom shows no faults. done 2 days ago.
yay...runs lumpy on startup and some white smoke not realated to temperature as there on warm days as well. runs rough at intersections but once up to speed is ok. acceleration ok.
mechanic will have field day with it.
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is the ignition timing correct?!
you need to put ecu to setup mode with vag com.... then adjust ignition correctly....
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sounds more like temperature sensor, or possibly leaking injector(s) to me. Can't see what ignition timing has to do with mixture, unless its not igniting the mixture.
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hi would the temp sensor come up as a fault on vag?
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only if its open circuit - i.e. totally failed. Worth noting that its two sensors in one unit, one for dash one for ECU - so even if dash says 90c then ecu might be getting 60c reading.
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ignition timing does not cause running rich, but the only indicator that that MIGHT be the case is increased consumption......
since jas changed a number of things, like cambelt which drives the dizzy shaft it is quite possible that ignition timing is off.... and yes this can increase consumption and slightly reduce power...
btw temp sensor can be checked with a cheap multimeter.... cant remember how many times i've posted this here:
(http://data.motor-talk.de/data/galleries/0/96/2436/49448415/temp-sensor-on-aam-716442293713747670.jpg)
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Ok I checked the ohms resistance on the temperature sensor.
I put up some pics on flickr so you can take a look here...
I have done this without the key in the ignition.. the temp guage inside read 90.
then i took the temp sensor off and got these readings. This is without the key in the ignition..
top- 3.99 k Ω
bottom 0,291 k Ω
temp guage at 70
top 4.00 k Ω
bottom 0.287 k Ω
You can take a look at the pictures.. on this link
http://www.flickr.com/photos/67897318@N06/8438946308/in/photostream
or look under vwgolfcl1996...at the newest photos...
Thanks
just wondering if i am doing it correctly..:)
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you measured the ecu and temp gauge :)
you need to measure the sensor that is in the flange. well at least you now know that the wiring is intact, which is not bad either cos you can now exclude it as a cause.
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aha silly me...I will try it again then tomorrow...
Does the ignition need to be switched on so the temp guage is active or no key in ignition needed?
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to check temp sensor take it out, put in freezer for 15 min, should be well below 0, then leave 30 mins at room temp should then be around 20 degrees, then put it in the oven for 15 min at around 80 degrees.
you won't need ignition to measure the sensor. it's diconnected anyway when you take the cable off
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how much coolant will l lose when I take this out?
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a liter or two. if you put a funnel under the flange and take off rad hose and collect in a bottle you will really only use far less than that.
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it appears to be working normally. i will have to look for the cause elsewhere. this looks like it will need a professional diagnostic check.