Hi All,

I have an Octavia I 1.9tdi (110bhp) estate remapped to approx 140bhp (by Celtic Tuning).

It has been excellent since the remap until a few days ago when I first noticed a dip in power during acceleration. This occurred a few times until today when after a ten mile run the acceleration in the top 3 gears was permanently pathetically slow, its like perhaps the turbo isn't kicking in (?).

I made it back to my house ok and noticed that as I neared home the car flew up some very steep hills in first and second gear so it appears the problems is only in the higher gears.

Any suggestions would be appreciated.

Incidentally, I have done a full VAG-COM scan and no faults are detected (performed when car was idling) except for an old fault regarding intermittent single line operation, though as this is an old known fault I don't think it is the cause of the acceleration problems.

Cheers! :confused:

Update: I have just done a log of measuring blocks 003 and 011 as described on the VAG-COM website. The MAF appears fine at around 960 at 3000 rpm and the Turbo actual/expected boost vs rpm looks almost as described on VAG-COM but without a significant spike at 2.1. This should make sense to those in the know if not please ask and I will clarify.

Unfortunately (?), during the above logging the car ran almost perfectly and was accellerating as normal (or damn close) so it may be an intermittent fault.

Maybe it have goed to overboosting and has been at fault state (turbo dropped out). It resets self by turning ignition power off and back.