Intermittent no-start MC turbo problem (kinda long)

[Nate Stuart]

Sounds like you simply have a flaky timing reference sensor. They can be
temp sensitive when they get old/worn out. Even if the car isn't
starting you should never see that error code, unless the sensor is
failing, or the wiring to it is damaged somehow. Those sensors (timing
reference and engine speed sensors) are what tell the ECU that the
engine is actually turning over, and to start the fuel pump. Thats why
when everything starts to magically work again you can hear the fuel
pump buzzing away.

They don't come very cheap new (looks like ~$110 from thepartsbin.com),
so you may want to gamble to test it out and grab one out of a junk yard
or something. The two sensors are interchangeable (engine speed and
timing reference).

HTH!
-Nate
'89 90tq
http://www.newtsplace.com/90tq

> The car will start and run fine with no problems 98% of the time.  I've put
> about 7k miles on it since the swap with little to no problems except that
> sometimes it will not start when I get in it in the morning (maybe once out
> of 75 starts).
>
> This behavior seems to happen only when the car has been sitting overnight,
> engine cold and possibly when there's been high humidity / precipitation
> (can't prove that last condition though) This only seems to happen if the
> car has not been run for longer than 10 hours or so
>
> When the engine fails to start, it'll turn over fine and crank with no
> problems but doesn't even try to run.  Upon closer inspection, it appears
> that the engine is not getting spark from the coil or to the cylinders.  I
> get code 2112 (crank sensors) coming from the ECU when this happens, but I
> understand this isn't out of the ordinary since the car is not starting.