E46 318 Unusual 'over-rev' whilst driving
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  1. #1
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    nessie2401's Avatar
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    2001
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    Exclamation Unusual 'over-rev' whilst driving

    Hi There,

    I have I have a 2001 BMW 318i (E46) automatic sedan currently at 172,800 km or thereabouts. This week (twice) I have experienced something rather odd. I am not sure the best way to explain it so please be understanding. I was driving to an appointment and I was very gently touching the accelerator pedal whilst in a 60 km (Sydney, Australia) zone which was about to turn into a 90 km zone with a slight dip before a smallish 'incline'. As I proceeded to be very gentle on my accelerator, the BMW decided to 'over-rev' (I apologise again if that is not the correct terminology) to 4,500 revs before taking a second or two to correct itself back to a better rev range for 90 km/hr. Whilst it is 'over-revving' it does feel for that time that I do not have control of the car. I do at this point have my foot on the brake to try and assist the BMW in correcting itself. The first time it occurred on Monday afternoon (26.09.16) it was a fine day (approx 3:45PM), road was dry, it was not raining and it took me by surprise and I pulled over as I was not sure what was happening and I put the BMW into P and the hand brake on before turning the car off and then on again. I proceeded to turn the BMW on again before making my way back onto the roadway and continuing on - the issue did not occur again that day.

    I was driving again in that same area, the same spot on Wednesday (28.09.16) it was a fine day (approx 3:45PM), road was dry, it was not raining. The same issue occurred where the BMW randomly 'over-revved' to 4,500 revs before taking a few seconds before correcting. When it happened this second time, I was a little more anxious because there was a lot more traffic around me and I was not sure what was going to happen. The BMW returned to the normal rev range for the speed that I was doing and I continued onto my destination (Belrose, NSW) before turning around and travelling on the same road where the incident had occurred twice and nothing happened going in reverse. (I have attached a photo of the road way where the issue has occurred in the hope that someone can help me! - Mona Vale Road, St Ives NSW) As per the attached image, my issue occurs about where the white truck is located in the image.

    This issue has not occurred anywhere else at any other time. I am due to travel on this same stretch of road again tomorrow (Thursday 29/9 - morning and afternoon, Friday 30/9 - morning and afternoon, Tuesday 4/10 - morning and afternoon) as I am doing longer hours for my work which require me to drive this particular route to my destination. I will be getting the BMW serviced after I have completed the additional hours for work.

    Thank you so much for your time..

    Ness

    Attached Thumbnails Attached Thumbnails -09-jpg  

  2. #2
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    ragtoprod's Avatar
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    Jun 2016
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    East Yorkshire
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    Year
    2002
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    if it's happened in the same place twice I would be looking at outside interference, I notice its roughly where the cables are strung between the pylons, highly unlikely to be the cause but you never know.

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