skink Posted February 5, 2009 Report Share Posted February 5, 2009 Hi All,My Mrs has got a 2004 / 53 Lupo 1.0 petrol.We bought it off a friend who had no problems with it, shortly before we bought it, it was serviced as the emmisions light was coming on. Coil Packs, HT leads and spark plugs were changed to remedy it.Ever since we bought it a couple of months later, the car would run ok apart from a lumpy idle now and again (apparently common), but the emissions light would be on and off at random. We took the car to a garage who plugged it in and said it was an intermittent misfire on cylinder 4, so we assumed one of the leads or spark plugs was dodgy (even though they were brand new) and tried swapping plugs and leads round on different cylinders, cleaning the throttle body etc, but still the same error everytime we took it back, so that kind of eliminates plugs, leads or packs as the culprit.Anyway the light went off then and hadn't been on for 3-4 months when all of a sudden the car started to idle very lumpy, almost cutting out and a loss of power accompanied by the emissions light flashing now and again.This leads me to believe that it's a Valve Seat problem which is apparently pretty common on these and requires the cylinder head to be replaced.Could anyone in the know confirm that it does sound like this and does anyone know how much it costs to replace the cylinder head? (the apparent solution).Any help would be really appreciated.Thanks! Quote Link to comment Share on other sites More sharing options...
treblet Posted February 5, 2009 Report Share Posted February 5, 2009 Lambda sensor? Quote Link to comment Share on other sites More sharing options...
VWR Lupo Posted February 5, 2009 Report Share Posted February 5, 2009 Lambda probes usually throw up a fault code and it would still run o.k? Odd one!Never heard of a valve seat problem on 1.0's Quote Link to comment Share on other sites More sharing options...
LuPo SpOrTX Posted February 5, 2009 Report Share Posted February 5, 2009 Does sound like a lambda sensor mate, I had exactly the same problem but with a Fiesta....obviously not quite the same as a Loop but similar style engine!Best of luck! Quote Link to comment Share on other sites More sharing options...
skink Posted February 5, 2009 Author Report Share Posted February 5, 2009 Does sound like a lambda sensor mate, I had exactly the same problem but with a Fiesta....obviously not quite the same as a Loop but similar style engine!Best of luck!Thanks. Worth a try replacing that, certainly be cheaper than a cylinder head Quote Link to comment Share on other sites More sharing options...
lupoluke Posted February 5, 2009 Report Share Posted February 5, 2009 Compreshion test, would help alot . Quote Link to comment Share on other sites More sharing options...
skink Posted February 5, 2009 Author Report Share Posted February 5, 2009 Compreshion test, would help alot .Will get it compression tested also.Anyone know how much it is for a lambda sensor? and where to get one cheap?Thanks Quote Link to comment Share on other sites More sharing options...
jeyesh Posted February 5, 2009 Report Share Posted February 5, 2009 Try GSF or Euro Car Parts Quote Link to comment Share on other sites More sharing options...
skink Posted February 16, 2009 Author Report Share Posted February 16, 2009 Hi All,Had the car compression tested and all was fine, they also had all 4 spark plugs out and they were sparking fine.That leads me to believe it must be a sensor somewhere, but the garage didn't think it could be that as the ECU would have shown a sensor fault code instead of the misfire code it always shows.Could a sensor issue cause the ECU to show the misfire code?I think the next step is try a lambda Sensor or take it to a VW specialist. Quote Link to comment Share on other sites More sharing options...
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