3b s2 coupe resurrection

[andy10v]

what? since when 7a and 3b gears are different?
Left one does not seem like it was 7a/3b gear.

this is how 3b/7a gear looks like: http://www.ebay.co.uk/itm/Audi-I5-20...-/221181943104
note the angle of gear teeth

it looks like 10v distributor on the left. can you please check again which was from your 3b and which was a loan distributor from 7a?

The distributor on the left is definitely the one that has been fitted to my 3B since I got it in 2009

I thought 3B and 7A dizzy was the same with a different rotor arm, also people fit the same metal gears, and fit 7a cams to 3bs.

The AAN with the cam position sensor in the dizzy location has the fine gear drive (3B left, AAN right)

http://forums.quattroworld.com/s4s6/msgs/22580.phtml

So is my car an oddball? Or has a mish mash dizzy?

[newsh]

Good ol 3B, parts bin special

http://www.sjmautotechnik.com/trouble_shooting/nostart.html#hall

Hook an LED up to your dizzy and crank it over.

[domas]

I am not too aware about AAN cams and tuna can hall sensor.

But again 7a and 3b must be the same. Either I am very mistaken or... lets wait for some more replies.

[andy10v]

Good ol 3B, parts bin special

http://www.sjmautotechnik.com/trouble_shooting/nostart.html#hall

Hook an LED up to your dizzy and crank it over.

Just using up stock of cam and dizzy gears? As long as they were fitted as a pair it was fine.

Thanks for the link, I need to order some LEDs, I will try this with the dizzy off the car, ignition on and turn the rotor arm by hand.

Peel back the rubber boot on this hall sensor connector and connect a DMM to terminals 1 and 2 with the ignition key on. The voltage measured across pins 1 and 2 will be ~4 volts when the distributor hall sensor is shielded by the metal cover (hat) on the distributor shaft. The voltage should be between 0-0.5 volts when the hall sensor is not shielded by the metal hat. You can remove the distributor cap, and slowly rotate the engine around while you watch the voltage measured at pins 1 and 2.

[andy10v]

Pin 1-pin 3 4.99volts
Pin 1-cam cover 5.02v

Pin1-Pin 2
0.11v Hall sensor shielded
4.88v Hall sensor un sheilded

[andy10v]

So mine seems to be inverted from what SJM says?

[newsh]

So mine seems to be inverted from what SJM says?

Sorry bud, I think the 200TQ is wired differently to the 20valve

[andy10v]

But as I get a low voltage, then high voltage at the window the hall sensor appears to be working ok?

Crank sensors next?

[newsh]

Yeah seems like it has output.

[newsh]

Did you actually do the really basic check for fuel and spark?

Injector in a jar / plug laying on the cam cover?

[Wizard-of-OD]

But again 7a and 3b must be the same

They are. I swaped a brand new 7A distributor complete into my 3B.

As for AAN cams early, that is the first time I have seen that and I dismantled 2 1992 AAN motors!

[Error404]

The hall sensor on the ABY is reversed compared to the 3B according to the schematics. Not sure if it matters.

[twoqu]

Just for clarity the ABY Motronic Manual shows the following:
Pin 1 goes to Pin 12 in ecu which is the 5V reference out.
Pin 2 goes to Pin 8 in ecu which is signal back in.
Pin 3 goes to Pin 19 in ecu which is the ground.
There is supposed to be 4.5-5.5V between Pin 1 & 3.
There is supposed to be 4.3-5.2V between Pin 2 & 3.
So its only Pin 2 that should change when the window is opened or closed.
As Error as said it appears that the pin assignmemnts were reversed from the 3B!
However we know that the engine started so it seems likely that the wiring was correct.
I remembered this:

http://www.picoauto.com/tutorials/audi.html

Unfortunately most of us don't have a few £K to drop on this piece of kit. But if you read carefully it says the engine would start sometimes when letting go of the ign key and even when it started it basically would run for 5mins before dying again. So that seems consistant with your issues. It also ties in with that hall sensor out of sync code you had.
So perhaps its a mechanical rather than electrical issue.

[martinws]

Man this sucks that you still haven't got to the bottom of it. Apart from my ABY ecu I don't think I have anything else of use to you. If you are still having issues I can maybe pop through and lend a fresh pair of eyes and put our heads together.

[twoqu]

Maybe cam pulley has sheared?