confusing or what
so they HAVE done a compression test
then what the hell was the point of checking for blue spark in the dark????????
you either have low compression, or you dont, spark is irrelevent until you sort out the low compression if that is the case
compression tests wont pinpoint a problem unless its compression rings, just gives you a clue..
think you need to ask the results of tests they have carried out, forget their opinion, you just want the actual results
compression test readings...ideally you want to know the total compression figure as well as number of strokes to reach that figure...plus, with your symptoms, would ask what compression was on first stroke...those figures for all cylinders, so a comparison can be made...all helps
exhaust gas readout, if they have done one plus any stored codes
if results of compression warrants it, also need to check valve clearances..they are adjustable according to autodata, though have never done this myself..was always under the impression they were hydraulic.
still doesnt make sense to me...either compression is poor, in which case concentrate on why by stripping it down, the condition of the spark is totally irrelevent at this time...if compression is good ,then you dont have a mechanical problem with the cylinder beyond tight valve clearances????...which leaves fuel/ignition fault