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5415RE: [bmw e28] 83 528E converting the car from automatic to manual 5 speed

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  • Jeff Schlenker
    Aug 17, 2010
      The fact that it runs means the TDC sensor is functional. Either the engine
      speed sensor is bad or the wiring is bad, or that pin on the computer is
      fried, or that circuitry in the computer internally is toast . Those cables
      (TDC & engine RPM) are shielded because the signals that traverse them are
      itty-bitty electrically. There is a lot of stray electrical interference
      (coil & spark plug wires most notably) in the engine compartment. Scrape the
      cable and the computer will get false readings. The distance the sensors are
      from the flywheel is also critical. Closer is better. The engine block must
      have a good ground and share the same ground as the shielding on the sensor
      wiring. I have several of these older BMW's and the first thing I do when I
      get one is re-do all the ground wiring. This clears up 90% of all the
      electrical gremlins. Spark advance is determined by engine speed (no advance
      = low power). The start of spark timing is determined from TDC sensor
      (backfire = unreliable TDC signal). A sloppy worn out timing belt will cause
      performance issues as the distributor is driven off the cam.

      From: bmwe28@... [mailto:bmwe28@...] On Behalf
      Of Gil Thereault
      Sent: Monday, August 16, 2010 8:15 PM
      To: bmwe28@...
      Subject: Re: [bmw e28] 83 528E converting the car from automatic to manual 5

      This may sound stupid. The first thing come to mind the automatic trans has
      a separate computer that is still hooked up?? Unless one of the two sensors
      are bad. Swapping out these may also rule out things.

      --- On Mon, 8/16/10, elswwjd316 <lone.antelope.ranch@...
      <mailto:lone.antelope.ranch%40gmail.com> > wrote:

      From: elswwjd316 <lone.antelope.ranch@...
      <mailto:lone.antelope.ranch%40gmail.com> >
      Subject: [bmw e28] 83 528E
      To: bmwe28@... <mailto:bmwe28%40yahoogroups.co.uk>
      Date: Monday, August 16, 2010, 1:36 PM

      Have completed converting the car from automatic to manual 5 speed. Ignition
      timing is still off after replacing both sensors on bell housing and having
      them set by a shop. Low power, hard starting and occasional backfire.....


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