Last year my swb tt auto started to play up on full throttle. I checked connections etc and still no joy. So I purchased Series 1 & 2 PTU's. I have just got round to swopping over series 1 PTU. Everything seemed a bit better, but as soon as the temperature increased , back came the lack of horses. It seems to be a missfire, but no smoke. If I drive it gently it seems to be oKish, but then if a blip the throttle hesitance and a missfire. It ticks over allright.

So maybe 2 faulty PTU's? or something else. Is there anybody near Andover who has a diagnostic set up? I would book it up with Zedworld, but I'm worried how far it would get and what damage might be incurred. I am reluctant to butcher my wiring to fit the series 2 device. I would prefer a interconnecting loom/cable.

Any ideas anyone??

how are your plugs? any boost leaks?

Just a thought, but as you say it's when it warms up that there is a problem, is your throttle balanced? Mine had a hesitation problem when warm and after reading a thread on here I decided to check my throttle balance, was way out on the drivers side, adjusted that with the little screw on the passenger side, so that both throttle bodies opened at the same time, and presto, no more hesitation.

plugs have been replaced. It was running fine and then I went to floor it and it didn't go as usual, almost sounded as if was going to backfire so I backed off. That was a year ago almost and as I said decided to change PTU... I don't use it often and have owned it 10 years and covered probably less than 20K miles.