Long start time 1.9 PD AUY

Vehicle: Seat Alhambra 1.9 PD AUY 115 hp Manual Transmission 6500 km Odometer

Problem: The engine only starts after a long period of inactivity. (As if the hall sensor is being disabled) This problem has been present from the beginning.

Completed Work: Engine control unit replaced, starter and battery replaced, camshaft sensor replaced,

If the engine control unit is re-coded for automatic transmissions, the problem is solved!
Unfortunately, this cannot be the case, as the vehicle maintains the engine speed during gear changes.

When the temperature sensor is disconnected, the problem is not as frequent, however, the engine speed increases significantly for a short time, as if you were pressing the accelerator to the floor.

Which parameters are changed in the engine control unit when it is reprogrammed for automatic transmissions?

In the cold state, the problem is not quite as common.
In a warm state, 9 out of 10 starting attempts succeed.

Is the position sensor of the camshaft set correctly, because, as far as I know, it has the most important task of recognizing which cylinder is firing? Maybe there's still an error there?
When it comes to a brand new car... what does the mechanic say?

The search function and database are your friend...

/viewtopic.php?t=3094

So, unfortunately, I am the workshop. Therefore, I have all sorts of tools available to me. But they are not helping me. I can rule out the camshaft sensor. It must have something to do with a size that changes when I reprogram the control unit for an automatic transmission. That is, normally, the coding for manual transmissions is 0002 and for automatic transmissions is 0001. If I code 0001 (automatic), the vehicle starts perfectly. If I code it back to 0002 (manual), the problem is back. I have also already replaced the control unit.

wildboy wrote:

So, leider bin ich die Werkstatt. Ich habe also alle möglichen Mittel zur Verfügung, aber sie helfen mir trotzdem nicht. Ich kann den Nockenwellensensor ausschließen. It must have something to do with a size that changes when I reprogram the transmission control unit for an automatic transmission.

Hi,

Please read the starting values in the manual and automatic transmission coding.

Maybe the automatic transmission will get a little more fuel, which, in combination with a weak starter / battery / frayed cables, gives the decisive advantage...

I did that, and it initially looked like it was working. When the engine was warm, the starter amounts were almost identical. I also tried increasing the initial amount, but that didn't help either.
I have now adjusted the pump-nozzle components. It is currently starting up perfectly. I've now let the engine idle and will then see if the problem is fixed.

wildboy wrote:

I've now adjusted the pump-nozzle components. It's currently starting up perfectly. I've now let the engine idle and will then see if the problem is fixed.

Not only see --> write

If the problem is resolved, it would indeed be worth adding as an entry in the error database. . . .

Unfortunately, nothing has worked. I urgently need a new idea. Otherwise, I'm finishing up for the day.

wildboy wrote:

If I code 0001 (automatic), the vehicle starts perfectly. If I code 0002 (manual) again, the problem reappears. I have also already replaced the control unit. When the engine was warm, the starter quantities were almost identical. I also tried increasing the starting amount, but that didn't help either.

However, automatic encoding cannot be the real solution, because then all AUYs would have to behave in the same way.

Is the booster pump working? Perhaps it will be controlled differently in the automatic coding process, so that some problem is hidden there?

Maybe this is also another case of camshafts that were adjusted from the factory?
For example, if the automatic software should inject later overall, it could better cope with a late NW setting.

Have you checked the starter speed or the cables between the battery and the starter after playing the organ for any warm spots -> contact resistance?