Sounds like you have done a lot of what should have normally have been general maintenance.
Is it knocking or pre-ignition? Does it run on after you turn it off?harry potter wrote: the engine does sound rough - there is a knocking sound that is noticable when driving and on tick over.
If knocking, what octane petrol are you using? I use 95.
Knocking would not be caused by a "cracked engine". But it is more of a rumble?
Umm. Yeah right. As I suspected. Can you get a retest elsewhere?harry potter wrote: they have said 'that it sounds like the engine has cracked somewhere down near the bottom end bearings. also they would not give it a test drive down the road incase they put a rod through the side of the casing as it sound like the engine is about to give way' the engine was also never opened up by them
l have been offered a engine (v8 3.5ltr) for £300 untested or arround £500-600 for a tested and approved engine from them.
Might I suggest that is where your high readings are coming from?harry potter wrote:also they did try balancing the carbs - one of the needles has actially undone itself and fallen into the jet, also the piston was not rising as it should on the dampener piston as the inside had been scored (potentially by myself when trying to adjust the carb)
Timing is probably an issue, that and tuning. Then you ought to find that your problems are resolved.harry potter wrote:l wounder if the timing was ever advanced fro the lpg???