[krustyflaps]

i fitted a new crank shaft sensor the other day its been running fine done a 100 miles since today i was just pulling in up into a car park and the engine stalled in first gear this is the first time i have stalled the car thought it was impossible the engine mangement light came on but the car started straight away and no more problems on the way home 30 miles i just read the fault code and it reads PO725 Engine Speed input Circuit Malfunction are they realted and is it serious i have cleard the code now

 

[ponchoj]

i fitted a new crank shaft sensor the other day its been running fine done a 100 miles since today i was just pulling in up into a car park and the engine stalled in first gear this is the first time i have stalled the car thought it was impossible the engine mangement light came on but the car started straight away and no more problems on the way home 30 miles i just read the fault code and it reads PO725 Engine Speed input Circuit Malfunction are they realted and is it serious i have cleard the code now

I would say they're related. The crank sensor is used to gauge engine speed.

Without it, the ECU would have to rely on the cam sensor and I don't think that would be enough to run the car properly....certainly not on the V6 engine anyway, that's only sends a signal once every two revolutions. Don't know about other alfa engines.

If they're the same then it would have to be a momentary blip. Check the cable isn't trapped, or touching the exhaust or something. Clean the connections too maybe?

 

[krustyflaps]

I would say they're related. The crank sensor is used to gauge engine speed.

Without it, the ECU would have to rely on the cam sensor and I don't think that would be enough to run the car properly....certainly not on the V6 engine anyway, that's only sends a signal once every two revolutions. Don't know about other alfa engines.

If they're the same then it would have to be a momentary blip. Check the cable isn't trapped, or touching the exhaust or something. Clean the connections too maybe?

its not trapped all clipped up and sprayed the connections this morning just keep an eye on it