Subject: 'normal behavior?' questions. Author: peeeot : member since August, 2009 : 222 posts Posted on: 2010-08-30 22:17:18

I have 2 things I'm hoping you other e23 owners can confirm as being normal for these cars.

One is a sort of high-pitched hissing noise that my car makes when accelerating. I only hear it if I'm beside a wall or another vehicle when acclerating. It's not super loud, but gives the impression of rushing air. If I rev the engine with the hood up, I don't really hear it, though the noise the intake manifold makes sounds kind of like a muted version of it. Anyone know what I'm talking about?

The other has to do with auto transmission performance. Most of the time, when I push the pedal down to about 75%, even if the trans downshifts it will start trying to pull from around 2k rpm and build speed slowly. This is in contrast to most other cars which will put the engine at a higher rpm point and let it wind up a bit before upshifting. Even my '59 Ford with its 2-spd auto will demonstrate a substantial increase in engine speed when I get on the throttle, though it seldom downshifts (can only do so much with 2 gears!) To put it another way, it feels like I'm accelerating a manual trans car in too high of a gear, in that there is little tq converter slip (as indicated by minimal rpm increase) and a slow building of both engine and road speed. Typical?

Btw, adjusting the trans cable will cause earlier downshifts, but the same general effect remains present.

1985 735i

• 'normal behavior?' questions. - peeeot 2010-08-30 22:17:18 (956 views)
  • Re: 'normal behavior?' questions. - Hitmanx 2010-08-31 17:10:39 (887 views)
    • Mine is the 4-spd all-hydraulic unit. - peeeot 2010-09-03 11:26:57 (885 views)
      • That downshift switch isn't connected on a non-EH tranny. (nt) - demet 2010-09-03 17:40:09 (1104 views)
        • Hah! I didn't know. What does the wide open switch - peeeot 2010-09-03 23:30:41 (945 views)
          • Lack of WOT signal may explain your leisurely acceleration. (pic) - demet 2010-09-04 08:46:03 (975 views)
            • Re: Lack of WOT signal may explain your leisurely acceleration. - peeeot 2010-09-07 10:50:28 (1338 views)
  • If you have the EH tranny have you tried the acceleration in sport mode? - phathome 2010-08-31 13:19:40 (908 views)
    • My '85 is probably the same as your '84 was. - peeeot 2010-09-03 11:32:36 (896 views)
      • My 85 non EH auto kicks pretty good- - stevebu 2010-09-03 14:30:53 (917 views)
        • How big is the gap - peeeot 2010-09-03 23:29:10 (973 views)
          • Re: How big is the gap - Hitmanx 2010-09-03 23:37:11 (929 views)
            • Re: How big is the gap - peeeot 2010-09-07 10:48:34 (1311 views)
              • Re: How big is the gap - Hitmanx 2010-09-07 23:03:15 (1298 views)