I've had my current car an Astra 1.7TDi (04) estate for nearly 2 years and in that time it's been a real 'dog' to drive - all 30,000 miles! It has never seemed to run properly but no warning lights have ever come on the dash in that time and I suspected that there were several things wrong with it.
It started to improve about 4 months ago when I moved jobs and stopped putting Tesco diesel in. It next improved when I had the timing belt changed at 70,000 miles. I suspect that the head timing was out!
This leaves me with what I hope is the final problem to solve.
The symptoms are:
It seems like the throttle is on elastic. It's slow to respond on acceleration and over-rev's when I dip the clutch to change gear (mixture?).
It also seems to be down on power at low revs and only pics up around 2,000 r.p.m., with a hesitation at around 2,500 r.p.m.
Also, when driving slowly the car is really 'jerky' when I roll on or off the throttle - no matter how smooth I try to be. This gets worse when driving in slow traffic and usually ends with me dipping the clutch when it starts to kangaroo!
It also rev's up on it's own about 500 r.p.m. when I dip the clutch in slow traffic.
I've also noticed recently that when driving at night and I look in the mirror when pulling away hard at a junction hard it smokes heavily (mixture).
Every so often the car seems to 'come in to tune' and drives 'normally' (if I remember rightly!) for a short time before going back to being a 'dog!
I hope someone recognises the faults above and can point me in the right direction. I looked at a few other threads on the forum and wondered if it could be a faulty 'air flow meter' or a sticking 'EGR valve'?
your desperately, SpenBeck