Opel astra 1.4 cam timing marks

the cam turns at 1/2 distance. It take 2 full turns of motor to return cam to the timing marks. have you changed timing belts, they do stretch.

Hi did you do the engine overhaul yourself? if so I don't think you have any comeback, but, is a registered agent did the work, you should take it back and get them to rectify the problem at their expense as they are the agents for the Opel company in Germany. Incidentally, General Motors sold Opel and Peugeot, France bought it, so you may have a battle to get satisfaction. Good luck!!

when you put belt back make sure timing mark is aligned / in correct spot

Is this correct for your vehicle below :
Opel Astra GTC 1.9 L 2006 model
Who puts out Opel Astra ? Is it Nissan, Ford, Chevrolet etc.
Let me know

remove the rocker cover and look on the ends of the cams ,their are slots and they align with the head ,i use my old spanner from my angle grinder its just about the right thickness ,lower pistons to the middle then set the cams ,make sure no1 the valves point up and outwards like a V victory sign then bring the no1 piston up to TDC ,i take the plug out and use a long thin screwdriver for this .then put the belt on

You need to have your car hooked to a scan tool, it will tell you what the computer thinks the problem is.

cam?
or spark only
what displacement they have many, huge.........!!!!!
wiki this.
2000 Daewoo , and see just how complex the engines are. ouch.
yours is GM,

Sig: I must ask questions first, I'm blind, and my tools can't reach, dig?

try checking all the wiring pugs on the engine particuarly the ones to the crank and knock sensors if you have a managment light on then plug in a code raeder and see what codes are stored

check that the cam sensor rotor is on the camshaft properly and is adjusted to the correct air gap
if the dealer just did the overhaul then take it back to them

may be the tendur it not gd and chek the valve