Vxownertelford said:
....Nobody will tell us just what the problem is only that the engine lost compression on number 3 cylinder at low revs but the car drove fine no lo ss of power smoke ect. They then said that replacing the engine might fix the problem but they didn't know for sure....
This doesn't make sense. The 1.0T is a 3 cylinder engine, if it had lost compression on one cylinder due to failed head gasket, piston rings or valve issues it would struggle to run at all and you would certainly notice a loss of power, smoke and very rough running.
Also why would the dealer be unsure if a new engine would fix the problem? If they knew the problem was in the engine then a new engine would definately fix the problem unless it was a design flaw that may exist in the replacement engine - unlikely.
This suggests it may be an electronic issue and rather than a new engine it may need new ECU, wiring harness or sensors. It is often the case that Vauxhall will supply a stripped engine, this would not include the ECU, injection system, turbo, cat etc. The dealer would re-use or transfer these parts across from the original engine which is probably why they suggested a new engine may not fix the issue?
Given the number of random electronic issues I've had with my car I would not be surprised if it was an electronic issue, very difficult to track down too.
Hope you get it sorted soon!