Motor won't start - G28 - engine speed sensor

[Tony Hoffman]

The pistons will hit valves in the 12V engine. I just tore one down here in
the shop. I'ts a matter of timing. You are nearly guaranteed if the cams
stop and the crank continues to rotate (as in broken belt) the valves will
bend. However, with them both turning together, you have to time them just
right to bend valves.

The ECU deosn't know you got it wrong because the cam position snesor sees
TDC the same time the crank position sensor does.

BTW, the multivalve V6 is a 30V, 5v per cylinder. It too, will bend valves.
seen it, fixed it.

Glad to hear you got it fixed!

Tony

On Wed, Jan 9, 2013 at 10:10 PM, Andrew Muff <andrew at muffster.com> wrote:

> OK, first - thanks for all of the suggestions. My buddy and I finally
> figured it out. After a suggestion to recheck the timing, we realized that
> we managed to have the timing off by exactly 180 degrees. After timing the
> 4 Audis we own between us about 15 times with no issues, I'm at a loss how
> we managed to get this time so wrong. And the only reason I'm admitting to
> this is so someone might learn from our mistake.
>
> So here is what not to do when timing your Audi. Do not put on the diamond
> shaped washers onto the cams backwards. If you do get one backwards, it's
> likely you'll figure it out when you put the locking bar across and only
> one side fits on. But if you are really not paying attention you'll manage
> to get both of them on backwards. That way with the crank locking pin in
> place, and the cam locking bar in place, you'll managed to set up the
> timing exactly 180 degrees off.
>
> The good news is that I'm told that on the 12v engine, all of the valves
> and pistons will still clear. I'm also told that you won't be so lucky if
> you have a 32v engine as the valves will strike the pistons ever so
> slightly.
>
> Now with a cam position sensor and a crank position sensor, why the ECU
> doesn't know that the timing is off and throw a code or a CEL is beyond me.
> But I'm happy to report that the car is doing laps around the block as I
> type. ;-)