Starting problem with 200T A -88

[Sami]

Hi guys,

I have starting problems with Audi 200 Turbo Automatic 1988.
It has a MC engine with Hitachi MAC-12D box.

Sometimes when starting it doesn't give a spark at all. The diagnostics says 
2111 and 2113, HALL and RPM senders. Also when RPMs are above 3000 the 
check-engine light is on which could be a knocking sensor problem but there 
is no diagnostics faults about knock sensor. I have changed the RPM sender 
and checked the HALL sender with LED and it seems to work ok. Also the 
wirings to ECU are ok I quess that the coil and ignition power stage are ok 
because when the engine doesn't start there is no signal to ignition power 
stage. The distributor shaft seems to have quite a big cap when turning it 
by hand, I wonder if it might be the problem...the engine also "hits back" 
sometimes when starting which could mean the ignition timing being too 
"early" but I have done the basic timing adjustment for the distributor and 
it should be ok.

What is the relationship between TDC sensor in flywheel and HALL sender? 
Should they give the signals at the same time?

Is the hall sensor a inductive or capacitive unit, I mean if I measure the 
Hall sensor, is there continuty between pins or not?

Thank you in advance

-Sami R from Finland
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