4113Re: [bmw e28] Power problems with 1985 (C Reg) 520i
- Jan 14, 2006I've got exactly the same problem as you. 1985 "c" reg 520i n i can't
get over 70mph. Just suddenly happened whilst driving. Feels like i'm
only running on 3 cylinders instead of 6 even tho it idles fine at
I've done a vacuum check on the inlet manifold & I have found that I
have got very little vacuum working through the inlet manifold
itself. So the cars working with normal fuel levels but with very
little air. Therefore using a very rich mixture & flooding the
engine. Sounds like I have a split air pipe somewhere around the
I'll let you know what my fault was when its sorted.
> >To: bmwe28@...reg)
> >Subject: [bmw e28] Power problems with 1985 (C Reg) 520i
> >Date: Wed, 14 Dec 2005 22:12:38 -0000
> >Hi, I'm hoping some of you may have some suggestions. My 1985 (C
> >520i will no longer go above 2500 rpm in any gear or when revvedhad
> >stationary - above this it 'stutters' and all loses power. I have
> >a diagnostic done on the ECU but am told all is well. It has beeninto
> >suggested that one of the sensors has failed and the ECU has
> >automatically entered mid range figures for its output and gone
> >'LOS' mode to prevent the engine from being damaged - however, Ime.
> >cannot find anything about this in any of the manuals available to
> >The ECU is the early L-Jetronic and I'm also told that the numberof
> >sensors is limited and anyway, the diagnostics do not extend to the(message
> >sensors as with later models.
> >Any suggestions welcome from those more experienced with these
> >wonderful but frustrating beats,I posted before on 23 Nov 05
> >4015) but no responses ( probably you're all as confused as I am )on
> >.... it's getting awfully embarrassing only being able to do 65mph
> >the motorway and having zilch acceleration. Even push-bikes beat me
> >away from traffic lights!
> >Thanks in advance
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