Numpty stepper motor question
Discussion
Apologies for raising this again but after following good advice on this forum to cure a high idle speed and slow decrease on start up, I took out and cleaned the stepper motor. Took great care when resecurit not to crack the housing and I think it is air tight.
No real diffrence that I can tell but I seem to recall there was some mention of needing to reset the stepper.
Is that so and if so how is this done?
Kind regards and thanks in advance.
No real diffrence that I can tell but I seem to recall there was some mention of needing to reset the stepper.
Is that so and if so how is this done?
Kind regards and thanks in advance.
medieval said:
Apologies for raising this again but after following good advice on this forum to cure a high idle speed and slow decrease on start up, I took out and cleaned the stepper motor. Took great care when resecurit not to crack the housing and I think it is air tight.
No real diffrence that I can tell but I seem to recall there was some mention of needing to reset the stepper.
Is that so and if so how is this done?
Kind regards and thanks in advance.
Disconect the ECU for a few minutes then recconect.No real diffrence that I can tell but I seem to recall there was some mention of needing to reset the stepper.
Is that so and if so how is this done?
Kind regards and thanks in advance.
Big clip on side of ECU should be at the side of the battery in the passenger footwell.
V8 Animal
Darren,
The stepper motor is the device just in front of the bulk head below the windscreen and is attached to the back of the plenum chamber.(the big silver thing on top of the engine that says 400, 450 or what ever depending on your engine size)
It looks like a big bolt with 3 wires coming out of it and is used to regulate the engine idle speed. (well in theory)
The motor turns a threaded rod inside which pushes a tapered tip in and out which in turn blocks and unblocks a small hole in the plenum chamber, which
again in turn allows more or less air into the engine.
This is what then regulates the idle speed, all of which is controlled by the engine management system.
Its the tip of this device which tends to get covered in soot and carbon which then can cause a poor seal to the other mating surface in the plenum chamber and this can cause the famous bad idle problems.
Hope that explains it a bit.
Paul.
The stepper motor is the device just in front of the bulk head below the windscreen and is attached to the back of the plenum chamber.(the big silver thing on top of the engine that says 400, 450 or what ever depending on your engine size)
It looks like a big bolt with 3 wires coming out of it and is used to regulate the engine idle speed. (well in theory)
The motor turns a threaded rod inside which pushes a tapered tip in and out which in turn blocks and unblocks a small hole in the plenum chamber, which
again in turn allows more or less air into the engine.
This is what then regulates the idle speed, all of which is controlled by the engine management system.
Its the tip of this device which tends to get covered in soot and carbon which then can cause a poor seal to the other mating surface in the plenum chamber and this can cause the famous bad idle problems.
Hope that explains it a bit.
Paul.
SimonV8ster said:
Can't you just remove the stepper motor (leaving it wired up) and turn the ignition on/off and then replace it ?? I thought this ensured that it was in its correct position when the ignition was off ??
What you can do is when you have the engine ticking over at the level you want, leave the engine running and then disconnect the stepper.I did this to mine and has ticked over perfectly ever since.
There have been some people say that after a while the inner rod had moved forwards reducing the tickover...the only 'problem' i have had is that for the first 30 seconds or so after starting you have to keep the revs up a little until the enine has warmed uo a bit.
smithyboy64 said:
just wondering,after cleaning step/mo, was u chim difficult to restart or did it fire up ok???????????????
Mine would fire up but then instantly died thats why you have to reset it. I just unscrewed it and turned the ignition on/off, you can hear/see teh motor wind in and out then put the thing back in again. The cone needs cleaning, but more importantly the keyway that runs down the shaft. Its a prime point for dirt to collect. Access can be tricky as the springs in the way a bit. I pulled the whole assembly out by clamping the cone in a vice, (obviously dont damage the tapered bit of the cone) and pulling / rocking the motor to make it spin. Its a bit brutal, but it does pull out slowly. You can then really clean it. To get it back in, just align the keyway with its notch, reconnect the motor and cycle the ignition on /off and it will pull the shaft back in.
Gassing Station | Chimaera | Top of Page | What's New | My Stuff