+ Reply to Thread
Results 1 to 2 of 2
  1. #1
    Fran Legran
    , ,
    Member No: Fran Legran's Avatar

    Yes | No

    EFI intake manifold compatibility

    I am currently working with two unmatched Zenith carbs on my 74 E9. I actually have them running reasonably well. However, I have three nagging problems that I have pretty much given up on: cold running (choke adjustments), an idle that seems to want to choose between two values (900 RPM and 1400 RPM, with no reason as to which it settles on), and a rough running (lean miss?) at around 2000 RPM cruising.

    So I am looking to upgrade to EFI. I plan on going with an aftermarket ECU, so my primary problems are finding a intake manifold that will bolt to my E9 head. Can anyone out there share some experience on what will work? My research tells me that any M30-engine intake made before '89 will probably bolt up, but that the intake port shape has a number of times between '74 and '89. Also, I understand the brake booster will interfere with the placement of many intakes. Sharing successes or failures are all appreciated!



  2. #2
    Registered Member
    Perris, CA, United States
    Member No: 129993 Earlyshark is an unknown quantity at this point Earlyshark's Avatar
    Join Date
    Aug 2005
    Rep Power

    Yes | No

    Re: EFI intake manifold compatibility

    If you are lucky enough to find a '79-'81 528i, 633 or 733 in the wrecking yard, get EVERYTHING, including wire harness, anything attached to the wiring harness, ecu, distributer, cam/valve cover, air filter, metal water line under the intake manifold. You will need a high pressure fuel pump (the donor car may have a good one) and a fuel return line will need to be added. However, going to Weber 32/36 carbs could be much easier, about $400.00 or so.

+ Reply to Thread

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)



Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
1e2 Forum