Dodgy accelerator

P

Panjabi

Guest
Have to press it so hard these days as it seems stiff.

Oh and I get a feeling that the gears are changing too late.

Its 1.0 Automatic.

Oh dear what could that matter be? Any help appreciated.
 
59 bhp is more than enough said:
auto's dont have clutches they have torque convertors not much experiance with auto micras so cant really help.
Assuming this is a K11, the Nissan CVT in it doesn't have a torque convertor, it uses an electromagnetic (or powder) clutch.

If the accelerator pedal itself is stiff then it could be the pedal hinge thingy, the throttle cable or the throttle body, I think the cable would be the most likely one, it might be a bit frayed or it could just need greasing.

If the CVT seems to be changing a bit sluggishly the transmission fluid level might be low so yank the yellow dipstick out and take a look. If it's low, top it up with proper CVT transmission fluid and see if it's any better. If the fluid level is right or topping it up makes no difference try a Nissan dealer or an automatic transmission specialist.
 
cheers you lot will check it out and see what is is. Although after a brief glance under the bonnet yesterday I noticed there were small cracks in the timing belt too - so it might be that and the tensioners. Here is hoping.
 
Panjabi said:
cheers you lot will check it out and see what is is. Although after a brief glance under the bonnet yesterday I noticed there were small cracks in the timing belt too - so it might be that and the tensioners. Here is hoping.
Timing BELT?! Ummm... I don't know about all the K11s but mine has a timing chain, u can see it if u take the oil filler thingy off. Assuming u mean one of the accessory drivebelts then, with it being made of rubber, if it's cracked the rubber's probably perished and it's had it. It's not a really big deal, they're more or less a wearing part. I've just remembered, with it being an auto it also has a kickdown cable which is attached to the throotle in some way so check if that's causing any problems too.

59 bhp is more than enough said:
how do the "powder clutches" work
If I've understood it rightly, powder clutches do away with the friction plate and replace it with a powdered material that can be magnetised. There's a coil (or set of) on one side of the clutch which gets a certain amount of current depending on the torque demanded from the motor. The current creates a magetic field which causes the particles of powder to join up, like a string of paper clips between 2 magnets. The stronger the magnetic field, the stronger they join up and the more drag there is between the driving and driven sides of the clutch (akin to increasing the pressure on the friction plate in a normal clutch). I've only managed to find one diagram and that's for an industrial one which is laid out a bit differently to the Micra one, although it works the same way.
 
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