The dreaded hot start problem

Discussion in 'General Motoring' started by 89 740 gl, Aug 6, 2014.

  1. 89 740 gl

    89 740 gl

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    As my user name suggests, I have an '89 740 GL. It cranks but doesn't start when engine is warm/hot. So far we have replaced: throttle position sensor (found a test somewhere and determined it was bad), Radio Supression Relay (fixed the no start ever problem we were having, but not the hot start problem), fuel pump relay, coil, and RPM sensor (the one on the bell housing. I've seen it called other things as well. This improved how well the engine was running, but not the hot start prob.) After it cools for 15 -20 minutes or so, it will start. I'm out of ideas and extensive internet searching has not yielded any other results. Anyone want to take a stab at this? I really need the help. :/

    Thanks!
     
    89 740 gl, Aug 6, 2014
    #1
  2. 89 740 gl

    89 740 gl

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    Edit

    Also the fuel pump relay behind the fuse panel has been replaced.
     
    89 740 gl, Aug 7, 2014
    #2
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