89 Audi 90 stumbling

[Mark Rutherford]

Did the knock sensor thing first.  Made no difference.  It was in general poor condition so I replaced it.  Made no change.  The one window thing explains why it will not start with MC distributor.  

I documented the symptom in my original e-mail.  The short version is:

As an example approach a 90 degree right turn, decelerate and shift down.  Pressing the gas results in nothing, (feels like no fuel or timing is retarded),after about 2 seconds it will shake then catch it's self at about 3000 RPM.

Thanks

Sent from my iPad

On Jul 4, 2010, at 4:55 PM, Huw Powell <audi at humanspeakers.com> wrote:

> 
> 
> On 7/4/2010 12:50 PM, Mark Rutherford wrote:
>> Checked the hall sender plug, looked good.  Decided to change the
>> distributor to see if it produced a change in behavior.  Pulled the one from
>> my parts car and found one of the wires had broken off the plug.  I then
>> decided to change the pick up in the distributor.  Pulled the shaft on the
>> old one, put the new one in the press and removed it.  In my haste I did not
>> get a reference mark between the windowed disk and the shaft.  Anyone have a
>> picture of a NG distributor, or is there a mark I can not see.  I also have
>> several MC distributors on hand.  Are these interchangeable?
> 
> There should be a TDC mark on the upper outside edge of the housing, visible with cap off.  Rotor should point at it when camshaft is at TDC (crank might get you off 180).  Then fine tune with timing light.
> 
> The crude version is that the rotor should point at the #1 spark wire at TDC.
> 
> The MC is a one-window set up versus five, so, no compatibility.
> 
> And as I said in other mail, try unplugging the knock sensor.
> 
> -- 
> Huw Powell
> 
> http://www.humanspeakers.com/audi
> 
> http://www.humanthoughts.org/