E36 316 Revs don't drop to idle when stopping
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  1. #1
    The name is Derek but people call me Derek.
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    Revs don't drop to idle when stopping

    I need some help regarding the latest issue.......Ever since the head-gasket has been replaced, the car idles like an automatic bus when stopping. For example, when I'm coming to a stop, I'll press the clutch and brake pedals, but the car will idle at about 1500rpm (compared to before when it would idle at +-850rpm when the clutch was pressed). Then when I do come to a complete stop, it will still idle at about 1500rpm for about a second or 2 before dropping down to the normal +-850rpm. Sometimes when I am stopped (traffic or waiting for someone), the revs will increase from the normal +-850rpm to 1500rpm then fall back down.

    Could this be caused by the Idle Control Valve? Will cleaning it cure this "automatic bus" syndrome? Will the mass air flow meter also cause this? And could it also be caused the timing? I presume these were taken out and put back in again when the HG was changed.

    Also, does anyone know where to buy ashtray bulbs from? I've managed to take the rear one out, but I can't seem to separate the bulb from the holder Is it all in one and only can purchase it from BMW? Or is there some secret James Bond 007 Austin Powers way of separating the bulb?

    Thanks!

    *Extra info: e36 1998 saloon/sedan, so 1.6 litre M43 engine. The car starts with no problems.

  2. #2
    Worn out....
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    1st thing to do is remove and clean the idle valve. These can stick especially if they have been disturbed recently...

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    DerekJr. (05-08-2012)

  4. #3
    The name is Derek but people call me Derek.
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    Quote Originally Posted by Steve View Post
    1st thing to do is remove and clean the idle valve. These can stick especially if they have been disturbed recently...
    Okay thanks man!! I'll do it when the weather makes up it's mind. Do I just need to wipe it with a cloth, or would I need some brake cleaner/degreaser thing to clean it?

  5. #4
    Worn out....
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    Remove it off the throttle body and spray it out with brake cleaner or carb cleaner. Hopefully it should free it up...

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    DerekJr. (05-08-2012)

  7. #5
    The name is Derek but people call me Derek.
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    Okay thanks man! I'll defo try it tomorrow.

  8. #6
    The name is Derek but people call me Derek.
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    Okay so 2 nights ago I decided to look at the throttle cable, particularly the end bit (where it hooks unto the lever thing that controls the butterfly valve I assume). I turned it 90 degrees and it cured the "automatic bus" syndrome. However, on the motorway this morning (when I was merging from slip road to main motorway) the car just started to accelerate without me putting the effort into the accelerator (I was following traffic). I completely let go the accelerator which had no effect, then I decided to pull over as I knew something was wrong.

    It turns out that the end of the throttle cable (the plastic bit) got jammed between the lever that controls the butterfly valve and the metal thing that supports the throttle cable cover. I turned the plastic bit 90 degrees back to how it was. The rest of the journey was okay. This isn't the 1st time I drove on the motorway after I rotated the plastic bit of the throttle cable. Any ways, just thought I'd update y'all lol. Seriously feel like getting another car. I doubt I'll get it to it's former glory like in my signature pic! Only probably is that is getting harder to find a good example 316i or 318i saloon near my area.

  9. #7
    A clever person solves a problem. A wise person avoids it.
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    Was it number 6 here you twisted round? RealOEM.com * BMW E36 316i Throttle Housing Assy

    Not unheard of for the throttle body to go tight, more so when warm.
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  10. #8
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    It seems you have found your problem, I had the same car back in the day, and (please bear with me, totally non-mechanic) i kept splitting the big rubbery air intake pipe which caused this same issue.

    It would split, and i'd spend weeks wondering why the car was over revving, then I'd realise and duct tape it up, then it would split again, and i'd forget and spend weeks with it not working right till i remembered and duct taped it. lol. i actually sold it real cheap while it was "broken" and the guy who bought is was like "yup, just needed a new intake pipe thingy - the thing covered in duct tape" - kicked myself for that one.

    Not really helpful to you as yours is a different issue, but that was why mine had the same problem, and a funny story.
    Yeah yeah, I'll fix my Sig soon......

  11. #9
    The name is Derek but people call me Derek.
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    Quote Originally Posted by Ronnie View Post
    Was it number 6 here you twisted round? RealOEM.com * BMW E36 316i Throttle Housing Assy

    Not unheard of for the throttle body to go tight, more so when warm.
    Yeah that's the thing I rotated. And the car was idling and revved great. I drove on the motorway and around town after I did it (when the engine was cold and running temp). But today on the motorway, that "number 6" got jammed between the thing that "number 8" screws unto and the lever thing that "number 6" hooks unto.....Sorry if I'm not making it clear. So I rotated it back and now I got the "automatic bus" syndrome back. Should I fasten/loosen the screw of the throttle cable?

  12. #10
    The name is Derek but people call me Derek.
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    Quote Originally Posted by Foolishbean69 View Post
    Not really helpful to you as yours is a different issue, but that was why mine had the same problem, and a funny story.
    haha, that was the 1st thing I looked at on mine, but all pipes seem to be in good condition. My problem only started after I had the head gasket changed.

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