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whistling noise and the cause of the low speed issue is air leaks on the intake side, change O rings on plastic manifold to metal manifold and the big O ring where the EGR valve goes into front of air intake.
actually its most likely the temp sensor itself, and its also the cheapest bit to try first. (about £8)
the glow plugs are controlled by the temp circuit, they stay on from cold until engine reach 60 degrees (the temp circuit switches that relay you showed picture of), so if the temp sensor is out of whack, no glow light (this is controlled by relay) and hence no glow plugs from cold and if the temp sensor then reads low or zero after running for a while it could easily be turning glow plugs on then and causing your knocking...
the advance solenoid is typically most noticeable when running hard, sometimes it will seem to 'pick up' on throttle response better than others, run tank to 1/4 full put in diesel injector cleaner (£6) and give it a good thrashing often cure it as they can stick sometimes.
glow plugs are actually easy to change but the manuals only tell you so much, you really need to remove header tank bolts and place header tank to right hand side, then remove header tank bracket from body (2 x 10 mm head bolts), this bracket and pipes attached will then push right down back of engine this gives plenty of clearance then to get top intake off.
4 bolts hold the plastic air intake on (most fiddly bit going back on is those bolts) and then all glow plugs are easy to change, set are about £18 on the like of eBay (their 10 mm thread versions on those engines)
my scudo has exact same engine set up set up as yours in picture, fault codes give nothing useful on these engines typically usually no faults shown even when glow lights etc not working, its a pretty basic set up.
my 1.9 scudo will sit at 90 MPH all day on the motorway, they are not bad if their well sorted and kept maintained.
best wishes
Fred
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