Intermittent no-start MC turbo problem (kinda long)

[Marc Swanson]

> 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.


I've seen the reference sensor fail intermittently but that is usually
temperature dependent in the cases I've seen (causing hot start
problems).  I imagine a moisture problem could provide similar
symptoms.  Time to check those connectors and use contact enhancer and
dielectric grease where appropriate.


> Any ideas on what to check?  Ignition switch maybe?

your car turns over ok so I believe that eliminates the ignition
switch.  If you've got a spare reference sensor I'd try that first and
see if the problem goes away.


Best Regards

--
-Marc
87' 4ktq
88' 90q
www.mswanson.com/audi