Stepper Motor Removal

[siwebster]

Hi, wondering if anyone can help - my motors running a bit 'lumpy' at idle, ie hunting a bit and sometimes dropping below normal idle as if it's about to stall.

I've had an educated guess at it being the stepper motor, I'm reliably informed that there can be a build up of carbon around the plunger, so as I had a bit of time today I thought i'd take it out and clean it.

Having never done this before, I thought it might be a straightforward job, but it appears to be a bit of a nightmare. I've tried to remove the plenum cover, but the stepper seems to be in the way of getting this out from under the mesh. Am I doing something wrong? Does anyone know a quick easy way to get the unit out?

Help will be much appreciated, particularly as it's meant to be sunny tomorrow so an ideal day for fettling and tinkering. Cheers, Simon

[mb450]

The stepper should just be unplugged and then unscrewed from the plenum chamber.

[siwebster]

Yep, I figured that, but how do you get to it? I can't seem to get an allen key in to undo the bolts - do you remove the plenum cover first? If so, how does it come out, it didn't seem to want to move out from under the mesh once it was undone...

[mt10argyll]

Linky http://www.tvrcc-south-wales.co.uk/stepper.asp

MAX

[dwgriffith]

siwebster said:

Yep, I figured that, but how do you get to it? I can't seem to get an allen key in to undo the bolts - do you remove the plenum cover first? If so, how does it come out, it didn't seem to want to move out from under the mesh once it was undone...

Unscrew the black part only from it's housing, 32mm spanner. The allen screws hold the housing to the plenum, leave that in place.

[siwebster]

Nice one, thanks guys, much appreciated. Suffering an unexpected hangover so might try it later when I feel a bit steadier! Sorry MB450, didn't quite get what you meant at first, all is clear now...

Edited by siwebster on Sunday 20th July 14:05

[TVRmuppet]

I cleaned the stepper motor for the same lumpyness over the weekend. It made no difference. I then cleaned the butterfly valve in the plenum and what a difference.The car now runs as silky as Silky the silkwork. So give that a try as well.

[siwebster]

Sounds like a good idea, how do I do I go about doing that?

Cheers for your help

Simon

[SimonV8ster]

Take the large rubber tube off the side of the plenum and look inside. There you will see the closed butterfly. Open the throttle to give you more access around it but don't shut your fingers in it, quite tricky to keep open.

[siwebster]

Cheers Guys, will give it a whirl and let you know if it does the job...