Im new to the site as a member but have looked often and thank everyone for help Ive received via others questions in the past. Its a great site.
I have a 1.9 CDTI Astra van. Sportive 120 model. I fitted a red unit about 14 months ago mainly to see if I could improve on the MPG as the new van was a bit dissapionting after running around in my older 1.7td for 200,000 miles which without effort returned 55-60mpg. I travel 120 miles a day to workand back so doing the same journey everyday its easy to see how the MPG compairs with and without the DTUK unit. My van has an auto 6 speed box and when i got it I was never able to get over 42mpg. With the box fitted it went up 8-10mpg instantly. The performance was a bonus and have nothing but praise for what the DTUK box has done to transform my van.
But i do have a problem that has happened a few times and Im troubled by it again now. I can travel to work OK in the morning but on the way home within 10 miles of setting off the little car and spanner light comes on. If Im quick and take off the DTUK unit before it goes into slow mode the light will extinguish after a few more miles. If I cant stop quickely and remove the box the light is then on for 30 mins or so in go slow safe mode after I have removed it. I remove the box and install the pug into the end of the loom only.
The last time it happened was around the same time in the service cycle with about 5000 mile to go before its service. When I took it in last time (minus the unit) Vauxhall said they had reset the engine management as the engine wasnt breathing correctly. It has been Ok since until now. Ive run it for a few days without the unit and all is fine until I miss having it installed and cant wait any longer and put it back.
Any one have any ideas. I did talk to DTUK last time and they offered to check the loom which I thought might have been the problem at the time. But to be honest I dont think it is the unit, its a engine or servicing problem.
Any help would be appreciated.