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Jun 14th, 2026
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Joined: Aug 2017
Posts: 310 Likes: 9
Learner Plates Off!
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Learner Plates Off!
Joined: Aug 2017
Posts: 310 Likes: 9 |
Had the same issue with my old '93 +8, it turned out to be the stepper motor sticking. +1. Crankcase fumes are fed into the plenum chamber to be burnt in order to reduce emissions. This gums up the stepper motor. It is possible to clean the piston shaft of the stepper motor but the rest is a sealed unit and the bits that move the shaft can't be cleaned. Once it starts causing trouble you are best off changing it. Any problem with tick over is usually the stepper motor till proved otherwise!
1994 +8, BMW Calypso Red.
2002 4/4, 4 seater, BMW Calypso Red.
How do you open the boot?
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Joined: Nov 2016
Posts: 122
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Nov 2016
Posts: 122 |
An update. I removed the stepper motor (idle air by-pass valve) and cleaned it again, but also its housing, and cleaned everything with carb cleaner. Re-assembled and bingo, idle behaves perfectly. I must say neither was very coked up so I'm thinking it might have been a particle trapped between the valve and its seat ??
Thanks for the replies, regards, John.
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Joined: Dec 2009
Posts: 37,416 Likes: 977
Tricky Dicky Member of the Inner Circle
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Tricky Dicky Member of the Inner Circle
Joined: Dec 2009
Posts: 37,416 Likes: 977 |
An update. I removed the stepper motor (idle air by-pass valve) and cleaned it again, but also its housing, and cleaned everything with carb cleaner. Re-assembled and bingo, idle behaves perfectly. I must say neither was very coked up so I'm thinking it might have been a particle trapped between the valve and its seat ??
Thanks for the replies, regards, John. Thanks for the fix result John, you never know when mine might start playing up some time.
2009 4/4 Sport Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Con Green +8 prev
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Joined: Nov 2016
Posts: 122
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Nov 2016
Posts: 122 |
BTW, if anyone needs a stepper motor a quality one is available for the 3.9 from Bearmach, there's the link https://bearmach.com/stepper-motor-etc6660Regards, John.
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