E46 316 Bmw rev problem ( when car is idle)
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  1. #1
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    Bmw rev problem ( when car is idle)

    hello peoples. hope you all okay and I want to appreciate that you helping out peoples like me.

    I have a BMW 2002 316ti se compact. petrol and converted on lpg.

    problem just started recently. when I start my car, it rev on 1000rpm for a min then drop down 600-700 rpm. but while driving and car temperature goes on normal. then if i idle my car, the rev's start playing about.
    the goes on 1000rpm and goes to 1600 rpm, then drop down to 1000rpm, the goes to 1600rpm. this procedure goes on and on, every after 15-10 seconds.
    engine management light came on as well, but i don't know if it is because of rev problem or because of LPG converted. but rev problem happens while driving on petrol or lpg.

    car drive good, i recently drove on 100mph, it worked fine. but only happens when its idle.

    pleaseeeeeee can one tell me what problem is it ?

  2. #2
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    Either you have a air leak from a induction/breather/vacuum pipe or you have a sensor issue I reckon.

    I would check for any air leaks from split hoses, split vacuum pipes, split engine breather pipes or split induction pipes, also any valves and diaphragms that may have failed.
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  3. #3
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    Quote Originally Posted by Ronnie View Post
    Either you have a air leak from a induction/breather/vacuum pipe or you have a sensor issue I reckon.

    I would check for any air leaks from split hoses, split vacuum pipes, split engine breather pipes or split induction pipes, also any valves and diaphragms that may have failed.
    do you think, computer diagnostic check will show the problem? or what else do i need to do to find the actual problem?

    is it dangerous driving with this problem?

  4. #4
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    Re: Bmw rev problem ( when car is idle)

    Isn't there a breather pipe that runs along the back end of the head tthats common for splitting on these????

    I seem to remember seeing a few in the past but that was a few years ago now.

    As said though,have a good look for split vac/breather hoses.listen for hissing with the engine running.

  5. #5
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    Quote Originally Posted by richeunos View Post
    Isn't there a breather pipe that runs along the back end of the head tthats common for splitting on these????

    I seem to remember seeing a few in the past but that was a few years ago now.

    As said though,have a good look for split vac/breather hoses.listen for hissing with the engine running.
    Number 2 here, RealOEM.com * BMW E46 316ti Crankcase-Ventilation/oil separator

    Check if that has split or collapsed while the engine is running.

    @bmw messed up you will need to visually check for split pipes at first, otherwise take it in to a garage if you don't feel confident.
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  6. #6
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    Quote Originally Posted by Ronnie View Post
    Number 2 here, RealOEM.com * BMW E46 316ti Crankcase-Ventilation/oil separator

    Check if that has split or collapsed while the engine is running.

    @bmw messed up you will need to visually check for split pipes at first, otherwise take it in to a garage if you don't feel confident.
    i read some peoples says about idle control valve? what does idle control valve do and where can I find it in car? can you reckon if that's a problem.
    its a bmw 3 series 2002 316ti se compact. petrol

    while car running, there is no problem and in any gear, if i put my foot down, it don't shake at all. very smooth while running BUT in idle, revs moves up and down. stays on 1000rpm and goes to 1600rpm until drops again.

    i checked all pipes, they are good but i will look at it once again, is there any pipes, i meant to look underneath?
    if its not pipes, then what else it could be? to cause the rev's to move up and down only when its idle

  7. #7
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    Quote Originally Posted by Ronnie View Post
    Number 2 here, RealOEM.com * BMW E46 316ti Crankcase-Ventilation/oil separator

    Check if that has split or collapsed while the engine is running.

    @bmw messed up you will need to visually check for split pipes at first, otherwise take it in to a garage if you don't feel confident.
    hi
    you and other dude mentioned about spilt pipes and that. THERE IS SOMETHING I SAW TODAY WHILE ENGINE RUNNING.

    if you look to the engine from standing in the front, there is a small pulley on the right side, the box on the right side where the air goes in, the pulley rubbed it and caused a small hole.

    do you think it can cause the rev's goes up and down?

    actually i found this link, it is exactly what happened to my air take lower box.

    2002 E46 316ti Air filter Lower Box Damaged?
    Last edited by bmw messed up; 25-11-2012 at 13:07.

  8. #8
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    Quote Originally Posted by richeunos View Post
    Isn't there a breather pipe that runs along the back end of the head tthats common for splitting on these????

    I seem to remember seeing a few in the past but that was a few years ago now.

    As said though,have a good look for split vac/breather hoses.listen for hissing with the engine running.
    just now, i was looking into it. there is air intake box, it got a small hole because of pulley rubbing.

    i found this link, it is exactly the same.

    2002 E46 316ti Air filter Lower Box Damaged?

    do u think, it can cause revs goes up and down?
    plus i got a maf cleaner, i just sprayed the sensor too.

  9. #9
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    I the hole is post MAF sensor,then yes it's possible that it 'may' cause an issue.Simple way to find out...cover the hole up and see if there is an improvement.

  10. #10
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    bmw messed up

    Quote Originally Posted by richeunos View Post
    I the hole is post MAF sensor,then yes it's possible that it 'may' cause an issue.Simple way to find out...cover the hole up and see if there is an improvement.
    hey thaks for your mail back

    vacuum box is the big box in which maf is fixed?

    i took the both boxes out and looked for any other holes, but only found one, which i already mentioned and super glued it with plastic, it is fine now. i also cleaned the maf with maf cleaner. all pipes were intact.
    i drove the car, firstly the rev's were really bad. it was n 600, i felt like engine gona stop.
    after drove little bit, everything since to be fine. but after i put engine on idle. revs start going up again but not that quick as it used to before.

    it is same on petrol and lpg.

    what else do u think it could be?
    Last edited by bmw messed up; 25-11-2012 at 15:37.

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