Hi, All I have a 1995 astra 1.7 low blow diesel. the revs on the tacho drift around a bit and are a 150 or so revs low. Does anyone have any ideas ? I thought it might be something to do wit the alternator.
thanks Jim
How did you check it is 150 rpm low? If you had a way of checking a pulse counting instrument this accurately, surely you'd be able to work out whether it or the alternator was at fault?
Like a slack fanbelt?
Indeed driven from the alternator- so check the drive belt isnt slipping. If the belt is slack, then the drift would tend to me more at higher revs or with a high electrical load- when the belt is more likely to slip
Tim..
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