hi
i own a 89 mk3 and have two of the above problems thus being crunching gears and it wont start with the clutch pressed down
here are the reasons
1. there is a cable adjustment system on the pedal that compensates for clutch wear sometimes it gets it wrong and gives too much slack which means the clutch can still be engaged very slightly that is why the gears sometimes crunch its a design fault that may have been (not promising) sorted out when the mk4 came out
2
the reason why the car wont start when the clutch is pressed is because the engine is so small it lacks the momentum to get started and the gearbox is slower than the engine at stopping so it aids in the starting of the engine.
3 get you\'re tracking done as it may be out, does the steering wheel judder, maybe you need to check tyre pressures (30-35 psi)
30 psi standard driving 35 for motorways
is this car carburetored or is it an injection engine if its carb\'d you can increase the idle by looking for the idle tap that looks like an old regulator of an oil lamp (circle shaped with flowery edges) turn that clockwise a minute amount to increase rev\'s dont do it with engine running you may get something caught on one of the belts,
Hope this helps
James Stephenson
mk3 fiesta owner/repairer/cleaner/driver
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