Re: Two problems

[Dave Lawson <dlawson@ball.com>]

Steve,

The 4000 rpm cutout is also caused by a bad intake air temp sensor. Here the 
computer is limiting engine speed because it is getting bad data from this 
sensor and can't look up the correct boost/timing numbers. My 83 TQC had 
also shown this problem. I ohmed out the wiring and cleaned the connection 
to the air temp sensor and it has been working fine ever since. On some cars 
the wires are soldered to the air temp sensor contacts.

For the two flywheel sensors, one counts flywheel teeth and the other 
detects flywheel rotation via a metal pin. These are used together with the 
Hall sensor in the distributor to varify engine timing.  The Hall sensor is 
only used at engine startup. After the engine is running you can unplug it 
and the engine will continue to run.

The workings and debug information of the ignition system is described in 
two factory manuals,  "quattro : introductory factory service training 
information" and "quattro : maintainance and adjustments manual".


 -
Dave Lawson  dlawson@ball.com