Reply to Thread

Post a reply to the thread: M70 engine runs rough acceleration only-stumped

Your Message

Click here to log in

Please correctly re-type the phrase f o o t d o c t o r in the form box. Re-type it without the extra spaces and put the one space where it should be. We apologize for having to do this but this silliness helps slow the spammers.

 

Additional Options

Topic Review (Newest First)

  • 12-04-2010, 09:44 AM
    bshupe

    Shogun thanks - I'll be checking the DK motors

    So many of the links seem to be dead - I'll try your site.
  • 12-03-2010, 11:56 PM
    bshupe

    Re: did you check both distributors and rotors?

  • 12-03-2010, 06:24 PM
    Highline

    did you check both distributors and rotors?

    that would be the first to check. Then check for air leaks around intakes, pull the intakes by hand and spray brake cleaner into that area to see if idle changes.
    And first thing I would do is cleaning the throttling valves, completely, often the brushes get stuck and then the problem starts.
    See pics on my website, also under refence data there are the data to test them, and here a good write up
    http://www.mwrench.com/Whitepapers/DKMotorcleanup.pdf

    Is the EML light coming on for 2-3 seconds when you switch ignition on and then disappears? If not, the problem is in the cluster. See link to Johan & Sean on my website, under electronics it is shown how to repair this problem.Shogun E32 Tech Tips: http://twrite.org/shogunnew/topmenu.html
  • 12-02-2010, 08:36 AM
    bshupe

    M70 engine runs rough acceleration only-stumped

    My 1990 750iL (about 70K miles, nice condition car) started running rough about 6 months ago. It would start and idle fine, but accelerating from about 2000 rpm it would miss and shake a bit. I replaced the plugs. It ran better for a few weeks and then the miss/shake came back. So I replaced the plug wires (and reset computer codes per Shogun) and again it ran OK (not like new) for another few weeks and the shake and loss of power comes back. So I replaced the O2 sensors and reset the codes again and it has been stellar for 6 weeks, great accaleration - fixed, no. Yesterday coming back from a 70 mile trip from home it started up again to the point were I barely got home. No power and extreme vibration during acceleration only. Starting, idling, low demand on engine its fine. How can a car be fixed and go back to its old ways on its own? No engine or EML light on. Any ideas? Thanks.

Posting Permissions

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