Results 1 to 3 of 3

Thread: Surge

  1. #1
    Join Date
    Aug 2017
    Location
    Saskatoon Canada
    Posts
    2
    My Cars
    1996 Z3

    Surge

    I have 1996 z3. engine surges back and forth 800 to 1000 rpm, probably more by the sound of it, but this is what the gauge shows), only when warm engine and not all the time. Sometimes the computer "finds" the right info and settles in at 700. It never happens when the engine is cold. I cleaned the auto idle control valve, then replaced it with no effect. When I unplug the wires from the valve, the engine runs slower about 700 rpm but a little rougher and no surging. There is no surging when the accellerater is depressed, only at idle, only when the enginde is warm, and it's intermittent. What do i check next? Someone said the fault is in the computer. How do I fix that?

  2. #2
    Join Date
    Jul 2004
    Location
    Houston, TX
    Posts
    12,462
    My Cars
    36 Cylinders
    Wrong forum.

    You need to read the computer codes associated with the check engine light, if on... That's what they meant.


    You likely have a vacuum leak from torn rubber boot/intake tract.
    -Abel

    - E36 328is ~210-220whp: Lots of Mods.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg
    - 1999 S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
    - 2019 M2 Competition, self-tuned, 504whp
    - 2016 Mini Cooper S

  3. #3
    Join Date
    Apr 2012
    Location
    Tampa, FL
    Posts
    4,403
    My Cars
    E36,E38, and E46
    Adjust the throttle plate further open. Someone adjusted it already because of the low idle while unplugged. It will surege more and more and then it will stop surging. The CEL sends it to an alternate map so you may have to adjust then clear the light and adjust again. It will feel wrong until it snaps in to shape.

Similar Threads

  1. ROUGH/SURGE Idle Update
    By HK_M3 in forum 1992 - 1999 M3 (E36)
    Replies: 57
    Last Post: 04-24-2002, 09:50 PM
  2. power flickers/surges WHY ?! PLEASE help !!!
    By Changster in forum General BMW and Automotive Discussion sponsored by Intercity Lines
    Replies: 4
    Last Post: 03-16-2002, 12:26 PM
  3. Rough/Surge Idle Mystery SOLVED!
    By HK_M3 in forum 1992 - 1999 M3 (E36)
    Replies: 0
    Last Post: 02-26-2002, 01:00 PM
  4. strange rpm surging??????
    By jefiddler in forum 1991 - 1999 (E36)
    Replies: 5
    Last Post: 02-20-2002, 11:32 PM
  5. car surges when cold
    By KiSsM3 in forum 1991 - 1999 (E36)
    Replies: 1
    Last Post: 11-20-2001, 01:07 AM

Bookmarks

Posting Permissions

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