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    Loss of acceleration at speed

    Here's the deal. On the road at about 70 mph. No idle problems, no electrical problems. Nothing suspect. Accelerator drops to the floor. No gas , no rev, nothing. Everything has electric power. Car coasts to a stop. I popped the hood to check for broken belts. Any smells nothing.

    10 minutes later, turned the key. Vroom. All the way home no problems. WTF! When I got home I checked under the hood again. I checked under body. No fuel leaks . Alternator at 13.3. ?????

    Any help would be appreciated. Thanks team........G.

    #2
    I'd suspect a loose battery connection or a loose ground.

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      #3
      I'm thinking maybe pump relays. Keep in mind all electronics worked. Pre set radio stations and 6 button OBC never missed a beat. This is a car I just got one year ago this month so I have done suspension, brakes, belts, ac, oem maf, alternator bushings, Optima yellow top, Alpine HU, steering wheel swap, z3 antenna, all under intake hoses, Ryan G splitter. Car runs like a top. Now this!!

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        #4
        I'd agree with the comment about relays, fit new Motronic and fuel pump relays. I once temporarily fixed a dead E30 just by thumping it's fuel pump relay with my Leatherman.
        My BMW site: www.unixnerd.demon.co.uk since 1996

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          #5
          Originally posted by g.ruff561 View Post
          I'm thinking maybe pump relays. Keep in mind all electronics worked. Pre set radio stations and 6 button OBC never missed a beat. This is a car I just got one year ago this month so I have done suspension, brakes, belts, ac, oem maf, alternator bushings, Optima yellow top, Alpine HU, steering wheel swap, z3 antenna, all under intake hoses, Ryan G splitter. Car runs like a top. Now this!!
          Ahhh, I missed the part about everything electronic working. Disregard what I said earlier about grounds/battery connections.

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            #6
            No worries Mike. Anybody have a pic of the pump / ECU relay location. This is my first M42. The engine bay set up is different. I will check real oem for relay part # and cost. Thanks for the feedback. G.

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              #7
              I'll take pic tomorrow for ya I have to check mine tomorrow


              Sent from my iPhone using Tapatalk
              91 318is "under construction"
              2007 328i - daily
              sigpic

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                #8
                @ stretchkid, good looking out. I'll be checking. It's funny, I checked YouTube and there is not much there for E30 M42 general maintenance. Lots of turbo stuff.

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                  #9
                  You have to remove the harness cover.


                  They are on the driver side. Same part #'s as an m20 (Replacement relay is part Part # 61368373700), usually orange, four prong. The white/silver five prong is your main relay for the ECU...

                  john@m20guru.com
                  Links:
                  Transaction feedback: Here, here and here. Thanks :D

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                    #10
                    I might as well replace all 3 since I'm right there. Thanks for the feed back...... G.

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                      #11
                      Main relay is part # 61361729004

                      Other 2 are the same (one is fuel pump, other is oxygen sensor).
                      john@m20guru.com
                      Links:
                      Transaction feedback: Here, here and here. Thanks :D

                      Comment


                        #12
                        After that, which you should do first,
                        the other things would be fuel pickup screen, filter
                        and pump, especially if there's crap in the tank.

                        t
                        now, sometimes I just mess with people. It's more entertaining that way. george graves

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