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1990 740 turbo

posted by  Amarin on  Tue Mar 10 00:43 CST 2015
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last visit: Thu Oct 23 22:42 CST 2014
[RELATED]

Hi Chris,

With a bad neutral switch the engine won't turn over, just like starting in gears other than neutral or park.

Try to spray clean the switch first before replacing. See if the no-start symptom improves for a while.

The switch has 4 wires. Two for the start circuit and two for ECU feedback. The feedback is to increase idle speed when gear is engaged to compensate for increased engine load. Otherwise engine vibration would be felt due to uncompensated idle during gear engagement.

Amarin.






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