fan noise when accelerating????

[need help]

Hi all new to this site right just brought an 02 plate Audi A4 1.9 TDi and all has been fine. BUT now i am noticing a fan like noise every time i accelerate. Aircon unit will be off and vents closed but will still hear this fan like noise coming from the dash area anyone any ideas please HELP

Regards
Dave
:aargh4:

[aaaa4aaaa]

Switch on the re-circulate function and redo the test, I've also had it, was merely the wind forcinging in via the vents. I normaly have the auto recirculate function on so it is not always there..

Regards

E

[madfella65]

is this by any chance the sound of your turbo that you are hearing?

[need help]

Thanks both for your reply i thought it might be the turbo as well but because this is my first audi tdi just wanted to ask the question. If it is the turbo it has only just started to work and seems very noisy. Going to have a dig around the engine on my day off wish me luck.

[hendy]

got same problem in my passat i think its turbo noise ........does your car sound loud when you lower windows ????

[need help]

Right the fan noise has now gone but so has all the cars power so iam thinking that the noise i was hearing was in fact the turbo and everything was fine. But now their is somthing wrong with the car can any boudy help?
:(

[nickynibbles]

Pop the bonnet with the engine running, rev the engine hard, if you cant hear the turbo spin up then you've got a problem with the turbine blade i'd hazard a guess. May just be jammed, if its disintergrated then you'd of heard bits going through the exhaust! Surprised your not getting an ECU warning light though? If you can hear the turbo in the above test give it a high speed motorway run (as in 70mph of course!) to blow out any cobwebs. If you cant hear the turbo, get it to the garage! I get the wind noise on my V6 and the recirculation button works by the way!

[need help]

Thganks for the reply. the problem was getting worse so i disconnected the MAF sensor and removed the air filter gave it all a dam good clean and touch wood the care is driving better than ever. But will take it for a high speed run at 70mph over the week end and see how we get on (Fingers crossed)

[hendy]

sorry to sound like a total thicko but what is the MAF sensor ?? and where is it located

[onzarob]

sorry to sound like a total thicko but what is the MAF sensor ?? and where is it located

Mass air flow or MAF, it senses the air going into the turbo so the ecu can control the amount of boost. Its located after the air filter and has a connctor in it.

See below

460

[need help]

Hi hendy as the post above explains about the MAF i wont harp on about it. Not sure where it is located on the passat's? but will be after the main air filter as the picture shows. might be worth changing your air filter as well mate

[need help]

ok so all was going well but know when i reach 70mph feels like i just hit a brick wall. All the power just go's then when i pull over turn the car off and then back on again the power will be their until i reach 70mph then just cut out any ideas guy's????? Also (sorry to harp on) but when i do have power and i can hear the turbo but when i open the car windows the wooooossssshing noise is really loud is that normal? or could it be a loose pipe? any help welcome guys

[onzarob]

you need to get the fault codes read, it could be the maf (doesn't allways log a code) or it could be overboot. I had this problem and the accelerated well but when you use more thrittle the car just drop revs like mad, felt like i was crawling up hill.

I knew what was wrong due to a pipe being broken on the pressure converter which controls the turbo, it logged a overboost code in the ecu.

Hope this helps

Rob:D

[need help]

Thanks mate looks like i will have to book it into the garage :(. Do you think it could be anything to do with different fule i put a tank of bt ultimate diesal then filled it up with asda's diesal?? Also is it worth putting in a fule additive to clean the enigine?? If so once you have added it do you need to keep adding it every time you fill the tank??

Thanks in advance

[hendy]

took my car into local vw audi specialist yesterday and he found a massive split in air pipe from intercooler to turbo replaced pipe job done !!!! i also had boot catch replaced and air con re gassed for £138 so i am happy and would recommend this guy to anyone

[need help]

Sorted my car is now sorted and run's like new the vacume pipe had come loose and another pipe had to be replaced cost me £35 (at a private garage not a dealer lol) well happy now its a joy to drive thank you all for your messages.

Regards
Dave
:biglaugh:

[technohippy]

hey i have an 02 1.9tdi and i have a very quiet (some people cannot hear it but i can) sort of grinding swooshy noise (is swooshy a word?
probably not) when i accelerate it does not happen when i rev the engine only when i am in gear and moving and it also only happens at low revs, when the revs get up a bit the noise seems to dissapear, also at constant speed there is no noise
i can only assume this is something to do with the turbo but having never owned a "turbo'd" car before i have no idea (though to me it sounds bad)