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any bmw experts?

  • 30-01-2005 2:52pm
    #1
    x in the city
    Closed Accounts Posts: 7,134 ✭✭✭


    my e36 is revving up at idle and also stalls or tries to stall when changing from lower gears upwards, say in city driving. its a 94 316.

    got the fuel filter done, no joy it seems......

    any ideas folks

    e


Comments

  • #2
    lomb
    Registered Users, Registered Users 2 Posts: 6,017 ✭✭✭lomb


    on an unknown motor that doesnt run right start with a compression check u can buy a tester cheap. just screw it into the spark plug hole and it will give u a leakdown result, if this is no good take it down to a car auction.
    then move onto the next thing-mafs, o2 sensors air cleaners, throttle bodies, obstucted damaged cats, faulty fuel injection etc. i dont think its too difficult to analyse a modern car with basic tools like a multimeter and a diagnostic plug but it needs to be done systematically.


  • #3
    stratos
    Closed Accounts Posts: 1,038 ✭✭✭stratos


    I think there is a post here. Someone had much the same problem, turned out to be the throttle position sensor (tps).


  • #4
    Seth Brundle
    Moderators, Politics Moderators Posts: 41,217 Mod ✭✭✭✭Seth Brundle


    Before you try anything else, clean the idle air stabiliser with carb cleaner and see if there is any difference. It is usually the cause of an erratic idle. Also spray this all around the engine to see if there are any vacuum leaks.


  • #5
    lomb
    Registered Users, Registered Users 2 Posts: 6,017 ✭✭✭lomb


    kbannon wrote:
    Before you try anything else, clean the idle air stabiliser with carb cleaner and see if there is any difference. It is usually the cause of an erratic idle. Also spray this all around the engine to see if there are any vacuum leaks.

    how would this indicate a vaccum leak? would u c bubbles?


  • #6
    Seth Brundle
    Moderators, Politics Moderators Posts: 41,217 Mod ✭✭✭✭Seth Brundle


    revs will drop or car could even cut out if carb cleaner is sucked into the system after you spray it around


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  • #7
    lomb
    Registered Users, Registered Users 2 Posts: 6,017 ✭✭✭lomb


    Very Clever :)


  • #8
    pablo21
    Registered Users, Registered Users 2 Posts: 728 ✭✭✭pablo21


    All very good suggestions, but in reality the first thing you do is plug it into a diagnostics tester, This will isolate your airlow sensor, o2 sensor,TPS, etc. It could also be your tank recert valve staying open ( It should only open at motorway speeds to vent to the carbon can under the bonnet) and you'll never know without a diagnostic. But like I said, you could spend all day guessing, just get a diagnostic run. Most respectable garages have the ability to test most models now.


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