I've read about a lot of people having problems with their Astra's with them having a poor idle, running lumpy, kangarooing and even cutting out.
I have a MK4 2000 1.6 8v Astra X16SZR.
It started to get some of these symptons so at first like many I thought it was a missfire so changed the plugs and leads...that didn't change anything so thought hmmm might be the coil pack... Got a new one of those and nope that didn't work.. GAAAH
I had no engine management light come on and couldnt get the paper clip test to work.
So I done some internet searching and came across a few Vauxhall forums (including this one) that mentioned things like cleaning the throttle body, EGR and ICV...
So I checked Throttle body, Clean as a whistle, but sprayed loads of carb cleaner everywhere like a mad man anyway.... no change.
Ok lets take off this EGR thing... Looks alright not too dirty, blasted a lot of carb cleaner into it and scrubbed away with wire brush... re fitted. Nope no change...
Hmmm must be the ICV then? Took that out cleaned it no change... I have a small parts store near me so thought this little part must be cheap to replace may aswell get a new one....£20, fitted nope no change.
Ok so maybe cleaning EGR didnt work, maybe a new one would sort it... wait over 50 notes? hmmm bit expenisve.... tempted but no. What about blanking it? yeah i'll do that everyone says that works like a dream! Blanked it....NO CHANGE.
So in the end I bit the bullet and took it to Vauxhall and they found out the problem was........an air leak on the inlet manifold with a big hole in the gasket.
They fixed this for £234...... which basically involved just changing the gasket and putting new coolant in (Said it was quite labour intensive and to be fair I didnt fancy taking it all apart). But they also told me that one of my tyres was in a dire state and my balancing was off (I had noticed a bit of a steering wheel shake at 80mph) so they also done that for me. In total with diagnostics, labour and VAT they charged me £384....*GASP*
I prob could have got it cheaper elsewhere but I was so fed up and just wanted it fixed so let them do it. When I picked it up and drove away it was like driving a brand new car. So different, I forgot what it was like to drive a lovely Astra. Got too used to the shaking along the road and kangarooing in 2nd gear....
Will give it a good run over the weekend and see how it goes on the motorway before being completely happy of course
Hope that can help some others who are having similar problems. Another thing to add to the list perhaps.