I have an Astra VXR-like from 2001, with the Z20LET turbo engine. From April till now the car hasn't been started due to a minor accident in the front (just the headlights and front bumper were affected). Now when i assembled it together, i had some problems with the engine, it started to hesitate until 2000 rpm then was fine, but at last the check engine light started to flicker then stayed on
Today i went at the local Opel dealer and managed to put the tech2 on the car, it said Engine Cylinder 4 misfire. The specialist there told me that could be a reason that the car was not started for almost 5 months and told me to put some new fuel in the tank and try to go on the highway and keep it high revs . The worst case he told me, that the ignition coil pack might be faulty. And also the spark plugs, but as far as i know because i changed them i have NGK Iridium BCPR16ES (i read somewhere on this forum about those plugs and they have 7000 km of use)
Do you have any other sugesstions ?