Astra 1.7 dti performance drop off - Ralph Bayley
I have an Astra 1.7 dti 2001 model with the isuzu 16 valve engine (y17dt) I've noticed that the performance of the engine has reduced and it's become a little sluggish. Also the engine appears to misfire occaissionally when the outside temperature is 6 degrees C or lower. The engine management light has not illuminated so that would imply that the engine management system is ok. I've checked the MAF to see if it was dirty which it isn't. I would welcome any suggestions as to what to look at. I use shell diesel and normally add Millers Diesel plus to the tank.