Porsche 2.0 Start but Stalls

Erikkraft wrote: ... the engine runs beautiful stationair when there is no vacuum connect at the MAP Sensor.
...

What happens when you close the hose towards the MPS?
Maybe Marc is right, and the engine needs this extra air...?

Regards
Norbert

Norbert,

When i reconnect the the vacuum at the MPS sensor while the engine runs, the engine stalls inmediatly.

Also when the engine runs and i pull vacuum bij hand (mouth)on the MPS sensor the engine stalls.

Regards
Erik

Hi Erik,

please answer: Do you clogg the hose when you let the engine run and disconnect the MPS or does the engine soak extra air through the hose / the connector?

- pulling vaccuum to the MPS signalizes low throttle, the mixture is leaner than without vacuum -

Regards
Norbert

Norbert,

When i take off the MPS vacuumhose from the manifold i place a plug on the connector on the manifold so there will be no vacuumleak.

Regards
Erik

Hi Erik,
all the readings you posted in your first post are o.k. - injector's resistance way too high, maybe a ground <earth> problem? Should be about 2,4 Ohms. There is a central ground connector at the plenum as far I remember.
Fuel pressure is o.k., did you check it with the engine running, too?

At this point I can mention only one more reason for the effect you describe besides a broken ECU:
- Injectors clogged ???

Regards
Norbert

Hi Erik,

just shortly from holidays: If you remove vacuum line from MAP sensor, your MAP sensor will signal full-load to ECU and thus make mixture rich. Does your MAP sensor hold vacuum? And have you checked your engine for vacuum leaks plus tested igntion timing?