1984 BMW 325e Miss at idle

Notices
 

Thread: 1984 BMW 325e Miss at idle

Reply to Thread
Results 1 to 5 of 5
  1. 1984 BMW 325e Miss at idle 
    #1
    Bimmer Fan
    Car Details
    doorgoo's Car Details
    Model of Car:
    325e
    Year of Manufacture:
    1984
    Transmission Type:
    Automatic
    Car Body Type:
    Coupe

    Join Date
    Aug 2012
    Location
    Pittsburgh, PA.
    Posts
    3
    Thanks
    0
    Thanked 0 Times in 0 Posts
    I have a 1984 BMW 325e that I've put tons of effort into, rebuilding the top end since it had been sitting for over 2 years. The problem is a miss in cylinder 5 at idle until about 1000 rpm where it begins to disappear. It has a refurbished head, just adjusted valves, injector is working, I have plenty of spark, I've ran out of things to try! I compression tested it and the compression came out to about 80 while the other cylinders were at about 135. I adjusted the valves which helped but it still misses at idle, although sometimes there isn't much of one at all where it's maybe the tiniest rumble or nothing to about to stall. I can't think of anything wrong on the bottom end that wouldn't just be a total loss of compression and power. When I run alongside my friend's 325es I can keep up no problem when above 1000 rpm and his car is running at 100%. I've done the IAC valve, my AFM wouldn't cause a single cylinder problem, nor would vacuum lines. I even moved around injectors after cleaning them and still the problem is only at number 5. Any ideas would be appreciated, I'm just at the end of my rope.
     
     

  2. Remove Advertisements
    BimmerForums.co.uk
    Advertisements
     

  3.  
    #2
    Authorised Bimmerforums UK Vendor
    Car Details
    bwchiptune's Car Details
    Model of Car:
    x5
    Year of Manufacture:
    2002
    Transmission Type:
    auto
    Car Body Type:
    estate
    bwchiptune's Avatar
    Join Date
    Jan 2010
    Location
    Hayes west london UB3 1BB
    Posts
    2,390
    Thanks
    26
    Thanked 248 Times in 217 Posts
    If you adjust these valve clearances cold on these small 6cylinder cars and you set them to 0.25mm they will be tight

    Run the car till the temp needle it just over the blue mark
    Then readjust the valve clearances

    If it still misses chech the ht leads and rotar cap

    But it sounds like a tight valve clearance or it has a sticky valve

    If the head is a recon and was from a engine that had the cam belt snapped on it
    This is know to happen if the valve guides have not been replaced after valve to piston damage

    PERFORMANCE ECU TUNING(ALL CARS)FOR Bimmerforums MEMBERS
    CHIPPING AND REMAPPING
    Dyno Dynamics Rolling Road
    WORKSHOP REPAIRS(BMW,AUDI,VW,VAG,MERCS)
    TURBO,SUPERCHARGER TUNING
    ENGINE TRANSPLANT ECU CONVERSIONS
    CODING & PROGRAMMING,
    ECU REPAIRS & DPF,CAT REMOVAL
    REMAPPING TOOLS AND TUNED FILES AVAILABLE
    M5 F10 M6 F12/13 REMAPS £699
    WE HAVE NOW MOVED TO HAYES UB3 1BB
    www.bwchiptune.co.uk
    www.bwautorepairs.co.uk
    www.tuningtools.co.uk
    +44(0)7831 10 30 30
    +44(0)208 561 18 18
     
     

  4. Adjusted Valves 
    #3
    Bimmer Fan
    Car Details
    doorgoo's Car Details
    Model of Car:
    325e
    Year of Manufacture:
    1984
    Transmission Type:
    Automatic
    Car Body Type:
    Coupe

    Join Date
    Aug 2012
    Location
    Pittsburgh, PA.
    Posts
    3
    Thanks
    0
    Thanked 0 Times in 0 Posts
    I already adjusted the valve clearance, it was a bit loose so I snugged it to the .12 that was recommended for when the motor is warm. This might have made a slight improvement. Should I adjust again when it's cold? And what would I want to do for a sticky valve? Thanks for your response.
     
     

  5. Remove Advertisements
    BimmerForums.co.uk
    Advertisements
     

  6.  
    #4
    Authorised Bimmerforums UK Vendor
    Car Details
    bwchiptune's Car Details
    Model of Car:
    x5
    Year of Manufacture:
    2002
    Transmission Type:
    auto
    Car Body Type:
    estate
    bwchiptune's Avatar
    Join Date
    Jan 2010
    Location
    Hayes west london UB3 1BB
    Posts
    2,390
    Thanks
    26
    Thanked 248 Times in 217 Posts
    Quote Originally Posted by doorgoo View Post
    I already adjusted the valve clearance, it was a bit loose so I snugged it to the .12 that was recommended for when the motor is warm. This might have made a slight improvement. Should I adjust again when it's cold? And what would I want to do for a sticky valve? Thanks for your response.
    If it has sticky valves it will need the head stripped down check to see if a valve stem is bent or has picked up and new valve guides will need to be fitted

    PERFORMANCE ECU TUNING(ALL CARS)FOR Bimmerforums MEMBERS
    CHIPPING AND REMAPPING
    Dyno Dynamics Rolling Road
    WORKSHOP REPAIRS(BMW,AUDI,VW,VAG,MERCS)
    TURBO,SUPERCHARGER TUNING
    ENGINE TRANSPLANT ECU CONVERSIONS
    CODING & PROGRAMMING,
    ECU REPAIRS & DPF,CAT REMOVAL
    REMAPPING TOOLS AND TUNED FILES AVAILABLE
    M5 F10 M6 F12/13 REMAPS £699
    WE HAVE NOW MOVED TO HAYES UB3 1BB
    www.bwchiptune.co.uk
    www.bwautorepairs.co.uk
    www.tuningtools.co.uk
    +44(0)7831 10 30 30
    +44(0)208 561 18 18
     
     

  7.  
    #5
    Bimmer Fan
    Car Details
    doorgoo's Car Details
    Model of Car:
    325e
    Year of Manufacture:
    1984
    Transmission Type:
    Automatic
    Car Body Type:
    Coupe

    Join Date
    Aug 2012
    Location
    Pittsburgh, PA.
    Posts
    3
    Thanks
    0
    Thanked 0 Times in 0 Posts
    I haven't gotten to ripping the head off since I'm busy, but I've noticed that my exhaust crackles like there is rock in it. Could that be a hint that an exhaust valve is stuck open?
     
     

Tags for this Thread

View Tag Cloud

Posting Permissions
  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts