X5 stalled/set codes while being inspected!

[workingonit]

Originally Posted by andrewwynn

Fuel pressure constant suggest FPR and fuel filler ok.

If vacuum pump on FPR vent would do anything so should running at idle.

Realtime O₂ values? (Trims are directly related but it's helpful to see).

If you still have the other MAF it does feel like MAF. Have you done the tap test?

Also: was the needle solid?

I recall fighting trims for a long time i put in cheap O₂ so i could get them fast and it seemed to work at first but then i had trim problems.

I ended up getting new Siemen MAF and Bosch O₂ and finally fixed. (just months before deer killed the poor car!)

Ps: i would still do the vac/psi test on the vent hose. Maybe wrong type of FPR that changes with vacuum.

Honestly i don't know how the injectors work properly without the vacuum feedback.

Back to O₂: compare bank one and two; are they very similar as they should be?

–awr–

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I have a proven good Siemens MAF, and good Bosch O2 sensors (low mileage) on the X, and all seem to be working correctly (refer to post #63, with pictures of my Torque Pro display, showing MAF, O2, and fuel trims).

The constant fuel pressure readings would indicate to me that there shouldn't be a supply problem, so why is there a momentary stumble/stall exiting hard turns, and lean fuel trims suddenly becoming rich fuel trims?

Makes no logical sense to me.

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