GolfGTIforum.co.uk
General => The garage => Topic started by: mk4 nutter on 03 April 2010, 13:21
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Hi all,this is my first post so go easy on me !! Iv just won a very slightly bumped mk4 gt tdi on a salvage web site, had it delivered to me and on starting it up it runs very smokey ( stinks of diesel )and runs a bit rough ( if it was a petrol i would say it had a plug off ) any advise will be appreciated thanks in advance.
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Get someone with VAG-COM to read it, or get a reader yourself.
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stick your head under the bonnet and look for any obvious signs of disconnected pipes
If its running rough at startup it could be the coolant temperature sensor which is about £20 form the dealers and 2 minutes to fit
But as Mr DH says get a fault code reader and see if anything is lurking........
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Diamond hell im guessing vag-com is a fault reader yeh ! the problem there is i cant move the car at the mo front end is off it, do you know any one in the teeside area that could round and do it for me ?? Rhyso, it runs rough all the time not just on start up ! and also the rad got it in the bump so lost water could this be the problem with the water temp ??
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if it runs rough all the time then its one of the following
boost leak
faulty MAF
what's the problem with the water temperature? :huh: I only suggested the coolant temp sensor as you mentioned its smokey on startup
What colour is the smoke on startup / when running?? If its thick and black you've got a boost leak
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The smoke is white and it has a strong smell of diesel ! just been out checked for any wires or pipes off, all ok, filled it with water ran it till warm and the roughness settled down but still kicking white smoke out !!!
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The smoke is white and it has a strong smell of diesel ! just been out checked for any wires or pipes off, all ok, filled it with water ran it till warm and the roughness settled down but still kicking white smoke out !!!
White smoke is not good - has it lost any oil at all??
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No loss of oil so why does it stink of diesel ? when i say white it could be bluey white !
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No loss of oil so why does it stink of diesel ? when i say white it could be bluey white !
bluey white means its burning oil :sad:
white is unburnt diesel :undecided:
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we will go with white unburnt diesel cos it stinks of it !!! what could be problem ??
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we will go with white unburnt diesel cos it stinks of it !!! what could be problem ??
That I don't know I'm afraid. My knowledge ends at that point :sad:
Does it sound like its firing on all cylinders??
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Unburnt diesel: temp sensor could be reading low-low, thus over-riching things.
MAF or something electrickeral NEEDS to be detected by VAG-COM.
Might be losing compression on the motor, but I think that's extremely unlikely.... unless it has a chocolate cam....
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It does sound as tho it is misfiring when cold but does level out when it gets warmer but still smokes! i was reading here about the glow relay, just been
out again to see how long the glow light stays on, it stays on for about a 1 second is this right or sould it stay on longer ?? looks like i'll have to repair
the car and then take it to get the falt codes checked.
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If your running it without water you will kill very quickly.
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No not running it without water although it is leaking im costantly topping it up till i get the new rad fitted.
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Until you've got a new rad in there you're not going to be able to get situation normal as far as the engine's concerned, so sort that and then take a view.
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Right men update new rad fitted and topped up with coolant. Fired up runnig rough and smoking alot, warmed up to temp engine settles down but still
smoking ! noticed a lot of air bubbles running through the clear pipe that runs from the filter to pump ( is this right ) cracked each injector of in turn and
as soon as i do this more air seems to run through the sed pipe ???? So iv got myself a vagcom but have not got a clue how to use it ! can any one give
me step by step instructions how to use cheers in advance Mark.