[urq] Finally re-assembled engine and car...won't start

[Thatcher Hubbard]

Okay, I think I know which one you're talking about, I thought it
might be a ground strap, but now that I think about it, why would a
ground strap be insulated.  It's a thick, black wire on my car.

When I was putting the timing belt back on the car, I was using three
indicators for TDC: the divot in the cam wheel, the notch in the crank
pulley and the '0' on the flywheel that's visible through the little
window on the bellhousing.  The would not all line up, I spent a
couple hours trying to get them to.  When I took the car apart I had
noticed that was the case, so I ended up setting it the way it was
when I took the car apart.  What I ended up with was the '0' and the
notch on the crank being where the ought to be and the divot on the
cam pulley being past the TDC mark.

Should I be able to put a multi-meter on the TDC sensor and get some
sort of signal to assure that I've got that part of the equation
right?


On Mon, 1 Nov 2004 07:54:49 -0800, Wolff <wolff at turboquattro.com> wrote:
> The TDC sensor is in the top of the bell hosing. It reads a pin on the
> flywheel. It is a much more accurate way to measure the position of the
> crank than the hall sensor. However, being a 4 stroke motor, the pin passes
> the sensor twice for every revolution of the cam. The hall sensor is used to
> determine the correct pass of the pin to use for ignition timing. I have
> heard that this comparison only happens during the starting of the motor and
> once running, only the flywheel pin is used. However, on a 3B I know from
> experience that the ECU does check the hall sensor postion after the motor
> is running as well and will cut boost if there is a significant difference
> in relative position.
> HTH,
> Wolff
> 
> 
> ----- Original Message -----
> From: "Thatcher Hubbard" <thatcher.hubbard at gmail.com>
> To: <urq at audifans.com>
> Sent: Monday, November 01, 2004 7:19 AM
> Subject: Re: [urq] Finally re-assembled engine and car...won't start
> 
> > Okay, I'm glad to know that it's likely not that my coil has failed.
> > I know about the Hall sensor window and stuff, but where is the TDC
> > sensor?  I didn't even know these cars had one, I guess I thought
> > that's what the Hall sensor was for.
> >
> 
> _______________________________________________
> 
> 
> Audifans urq mailing list
> Send posts to: mailto:urq at audifans.com
> Manage your list connection: http://www.audifans.com/mailman/listinfo/urq
> Have an urq question?  Check the Audifans Knowledgebase!
> http://www.audi-quattro.org/cgi-bin/twiki/view/Audi/UrQuattro
> Have an urq answer? ... Please help others by adding to the KB ... all contributions welcome!
>