engine smoke and bad idle

[vr6andy2.9 0]

hi there im a newbie lookin for info, first off ive owned my new golf mk3 2.9 vr6 for about 3 weeks now and i find it smokes when it feels like it...on start up its smokin a blackish grey smoke which i believe to be very rich and it stinks of fuel out the back..when shes warm shes fine but when i give it some throttle.. sometimes the same colour smoke fires out the back...but once i was coming down a very steep hill in second gear revs quite high on vaccum then stopped it was smokin very bad and it smelt like burnt oil and was blue in colour but this soon cleared once i drove off...im also having lots of trouble with bad idle ie: cuts out sometimes and is very irractic on start up after say 2 seconds, once its warm it falls and flicks back up and is normal any help wpuld be great. cheers

[VR6Pete 1,455]

do you find that it's burning alot of oil, what mileage is it on?

[VR6Pete 1,455]

what grade oil is it using? it should be using syntha silver....

[vr6andy2.9 0]

hi there m8, im not sure what grade oil is in it....and as for the oil comsumption...it seems to be fine. i dont think theres any internal damage as it would smoke constantly.....my theory on the hill issue the other day would be, on vaccum its suckin real hard so its dragged some oil into the throttle body and burnt it off...once i opened the throttle it soon cleared up so i rekon the oils not been changed for a long time and or its the wrong grade and thin so its draggin through easier...would u recommend a thicker oil as the cars approx done 90,000 from what he told me coz its had the corrado engine conversion....what plugs oil and leads would u recommend as im about to partly service it myself and then send her in for the professionals to sort my erractic idle. cheers

[vr6andy2.9 0]

also what about clogged breathers or oil sat in them, i find it strange it only does it whenever it feels like it.

[acf8181 0]

do an oil change and put in some synta silver and go from there...a garage once put too thin an oil in my vr6 and it started smoking, changed it back to synta and it was fine again.

[vr6andy2.9 0]

thanks for info guys....whats this oil and where can i get it and how much? 10 40`s is what i need?

cheers.

ps: what can i check clean for bad idle?

[vr6andy2.9 0]

ngk spark plugs for a 2.9 vr6.....anyone know what the part number is and what type to go for?

[vr6turbo 27]

i would do a compression test to see if the head gasket is ok

the garage can test the water for hydrocarbon contamination then if those checked out

do a full vag com check of all the sensors

if you would be willing to travel to or near scarborough

i could plug in my laptop and check for fault codes

also check all your hoses irratic idle is normaly a sign of a leaking vac hose or bad sensor

then plugs check to see if they are oily

change the oil for some vw syntha silver or gold

make sure the oil level is correct and the dipstick tube is properly pushed into the block

otherwise you get a false reading on the dipstick

[rickvr6 0]

ISV for your idling problem. Take your throttle body off and clean it with carb cleaner, bet that sorts the idle. Do the clean b4 u buy a ISV though. Smoke, mine did it, VW tolld me valve stem seals, but it was just a sticky valve. Mine was worse on hills too, ans on acceleration.

[badboyV6 4]

blue smoke on the over- run- if your lucky breather. However im 99% certain- its the valve stem oil seals the oil builds up around the seals and when you accelarate at the bottom of the hill for example, pressure pushes the oil passed the valves (via the worn degraded seals) into the cylinder and gets burnt- thats where the blue smoke is coming from...

valve stem oil seals can be done with head in situ- need a VV specialist to do it though, using a different oil wont solve your problems- a thicker oil will calm it down slightly......- use a 15w40- but ideally you need to change the seals and revert back to 10w40 semi synth- i know this as I had exactly the same issue with my last VR6, i thought it was the flame trap letting oil through into the throttle body (as mine was also oily), however the oil isnt enough to cause the amount of smoke being blown out the back- this is due to the flame trap not working- and letting in oil over a long period of time.

[vr6andy2.9 0]

cheers for the info m8....where did u get your vag com from...how much?.....why do u say head gasket?

ps: a sticky vavle, what did u do?

[vr6andy2.9 0]

wow how much would vw charge to change the seals? the other day i was cleaning the isv out and it was clean after spraying carb cleaner init...the pipe that goes on isv leads to a box on the breather system with a metal plate underneath it ...should this be hissing? shall i clean all the breather pipes out and check the sensors on the engine and clean....what with? give her an oil change as shes due in 1000 miles anyway and do the fuel filter,oil filter, plugs and leads get it tuned and take it from there.

[mightyvr6 0]

NGK BKR5EKU(P) are standard vr6 plugs.

[badboyV6 4]

i was quoted around 300 to do the seals at a specialist...A specialist will use a special VW tool (a threaded air line socket that screws into the spark plug hole) this keeps the valves up while replacing the seals. If you take it somewehre else they may quote you a lot more cos they would probably take the head off!..... hope that helps....

[vr6andy2.9 0]

hi, ive cleaned the breathers out and cleaned the isv and taken the throttle body off and cleaned that too...ive also taken the hall sensor off and cleaned that aswel.....still got bad idle but only seems to cut out when ive given it abit of stick and put the clutch in before i stop and it stalls it still likes to flicker up and down also, if i take my time i can stop it from doin it but its still not right...ive also noticed a snapped wire on one of the sensors...its the one where a pipe comes of the left side of the rocker cover and then a sensor is put in between the pipe that then runs to the induction pipe..what is this? cheers

[vr6andy2.9 0]

can i repair the sensor ie: put the wire back in? how?

[madvr6 0]

Smoke' date=' mine did it, VW tolld me valve stem seals, but it was just a [b']sticky valve. Mine was worse on hills too, ans on acceleration.

How do you go abbout sorting a sticky valve?

I got the same simptoms too at the mo, and also think mine is running very rich as its spitting flames out the exhaust, and on the over-run it pops and bangs followed by a bit of smoke?

[vr6andy2.9 0]

well bin to vw midland specialist and my maf sensor is shot and the lambda sensor is clickin on and off slowly.....or was it the maf lol...anyway there fooked...how much ? and does the 2.0l maf fit????

he also said possibly the sensors are making it smoke or the head needs a rebuilb.

cheers