MAC11 update

[John Cody Forbes]

DING DING DING Ben just found a possibility that I haven't seen suggseted 
nor checked yet. Check the engine's ground strap for cleanliness and 
tightness. Then check it again. Maybe, just maybe, the ground is not good 
enough to allow the ammount of current flow required at higer-than-idle 
RPM's.

-Cody

Ben Swann wrote:
> Cody,
>
> That is a good clarification - what this also means is that in order
> for the primary signal to be generated, both flywheel sensors need to
> be present and signaling and they must sync. up with the Hall sensor
> in the distributor cap.  This also triggers the fuel pump.  From then
> on out, the primary goes through the Darlington Transistor/signal
> amplifier mounted on the coil then through the coil, cap and rotor
> and out through the wires and plugs to ground.  So the only things
> that could be breaking down are coil, cap, wires or ground.
>
> Once again, unlike the earlier cars that used only hall signal to
> generate primary( five window hall distributor), there is no ignition
> timing adjustment - distributor must be in a set position, which is
> preferably dead middle of the hall window.  The ECU does the rest of
> the timing.
>
> One possibility that breaks this above "rule" down is that the timing
> belt has slack and/or window is just on edge so that the ignition
> slips out of window.  Usually this reveals itself in a no-start
> condition that is temperature related.
>
> So - you might have a breakdown in the spark output side, but I think
> you have covered thost bases well.
>
> Ben
>
> -----Original Message-----
> From: John Cody Forbes [mailto:cody at 5000tq.com]
> Sent: Wednesday, September 10, 2008 1:08 PM
> To: Ben Swann; 'Rick Houck'; 'Louis-Alain Richard'
> Cc: quattro at audifans.com; 'P Cole'; 'Ado Sigal'
> Subject: Re: RE ; MAC11 update
>
> What Ben means to say is that all is well with primary ignition
> (signal output to the coil), but the ECU knows nothing about whats
> going on in the secondary ignition (everything between the coil and
> plugs inclusively) and won't store codes for these areas. Thats where
> the scope comes in. Get ahold of that scope, your problem will be
> diagnosed for sure.
>
> -Cody
>
>
> Ben Swann wrote:
>> Again - what do the MAC-11 codes say.  If 4 4 4 4 then all is well
>> with ignition.