Car Mechanics (UK)

Prob­lem with ac­cel­er­a­tion

- Paul Gore Iceland · Vanuatu · Austria · Belgium

My ve­hi­cle is a 2006 VW T5 with 107,000 miles on the clock. When the ignition is turned on, the ac­cel­er­a­tion is in­stant and the van drives like a GTI. Then, after ap­prox­i­mately four miles, it is not as in­stant and drives like a stan­dard Golf. When I stop for five to 10 min­utes and restart, the ac­cel­er­a­tion is like a GTI again. This has happened since I bought the ve­hi­cle in 2009. Is this a char­ac­ter­is­tic of this van?

I have re­placed the fol­low­ing parts: the MAF, CTS, MAP, TBPS, fuel boost senor, EGR cooler, N75 water temp sen­sor, EGR valve so­le­noid and pres­sure valve. The EGR and turbo have both been cleaned. The in­ter­cooler has also been re­placed and the DPF re­moved and the ECU remapped. I have also had the fuel tank cleaned out. The ve­hi­cle has been reg­u­larly ser­viced at 48,000, 60,000, 72,000, 84,000 and 95,000 miles.

My first com­ment would be that, due to re­cent changes in leg­is­la­tion, it is no longer le­gal to have the DPF re­moved and this will need re­plac­ing to com­ply with MOT reg­u­la­tions.

Look­ing at the list of com­po­nents you have al­ready re­placed, this in­cludes the coolant tem­per­a­ture sen­sor, which would have been my first sug­ges­tion. It is hard to say ex­actly what the prob­lem may be and, from what you write, it is not bad when warm but very good when cold.

As the orig­i­nal ac­cel­er­a­tion is re­turned after switch­ing off and on again, this is most likely the re­sult of an elec­tri­cal item re­set­ting. I would ad­vise get­ting the sys­tem read for any fault codes and would check the live data for any ir­reg­u­lar­i­ties in the given data. You do not say if the ECU was remapped, but the symp­toms may be a re­sult of the remap­ping.

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