loss of power

hi ive got a mk4 53 plate golf and for the last couple of weeks i have had a loss of power there were some occasions that the car had picked up. ive taken it to my local garage in swansea which is the registered repairer because it is under warranty and the mechanics said that it was fine i said i wasnt happy with it so eventually with a struggle they booked it into vw sinclair in swansea they said that they had done a diagnostic check and said nothing was found. im new to all of this i really don't know what to do any ideas.

many thannks

filly

Hello and welcome. What is the engine in this car?

hi there thanks for gettin back its a 1.9 gt tdi 150 bhp is there anything else you need to know.

I had a similar problemwhen I first bought my TDi 150. It seems that the Fuel Hose had been squashed so there wasn't enough fuel for the turbo to be activated.

Two common problems spring to mind when there are no fault codes stored, the Air Mass Meter which is a huge problem on all modern VAG products and is affordable and easy to fit and the other is a faulty turbo which is neither affordable or easy to fit and is a common failing on the ARL 150PD engine, I have one to do next week.

wat do u suggest i look at first it is under warranty but the garage which is the registered repairer up here said there is no lack of pwer but my uncle is a diesel fitter so maybe i could ask him to look at it many thanks for getting back

It would help if you could get someone who knows these cars to drive it and experience the problem. Does the problem come and go?

hi there yeh it does come and go but the last week or so it seems to have got worse il let my uncle look at it he is a diesel fitter for coaches so hopefully he mite no because the garage which i have been going to are no help at all and said that all problems would show up a message thank u very much 4 getting back it has been so stressful not knowing wat to cos my dad doesn't no anything bout cars

If its under warranty, ask them to replace the Air Mass Meter. It's a common problem as mentioned by Crasher, and the Diagnostics won't pick this up in their tests, unless they do extensive checks to analyse the bhp output etc - which I very much doubt they will.

Apart from that, no idea what it could be. Do let us know how you get on though.

Have you experienced a juddering at very high speeds, above 80 ish MPH, even though you should not be going that fast? Ask your uncle to check the engine at idle, to see if the engine shakes, almost as if it is missing on one cylinder and if the exhaust fumes smell odd and oily, rather like they aren’t fully combusted. Also ask him if he thinks the turbo sounds excessively noisy, basically whistling too much. Do you know if the engine could possibly have been chipped/remapped/modified in any way? It may be worthwhile seeing if the VW dealer knows if the car has had or is due for any software updates. Don’t give up; you have consumer rights to ensure this car is as it should be, if you don’t get satisfaction you need to start getting heavy with threats of Trading Standards and solicitors letters.
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