2003 X5 stalled while driving at low speed

[workingonit]

Originally Posted by Effduration

Long Term fuel trims at -8% ??

That's not right...that tells me it is running RICH.. The minus sign says that based on O2 readings the DME is removing fuel from the air/fuel ratio.

Ideally, the Long term trim should be about +2-3% after warm-up.

I would check fuel pressure at the rail...should be close to 50psi...We had a bad batch of Hengst fuel filter/regulators that resulted in 60 psi and a rich condition.

Not good news for my situation, having just bought a Hengst FPR/filter, last month. Hope it's not bad out of the box.

While my health is keeping me from changing out the filter right now, in preparation for a fuel system refresh, from tank to injectors, I got mine from Amazon (and a Vevor cordless ratchet) using a gift card, hoping that it would help fix my fuel delivery problem.

After installing a new fuel pump, my M54 went from running lean to running rich (like the OP's X), and stumbles on hard turns, and when I last checked fuel pressure at the rail, it suddenly dropped to zero, leading me to suspect a partially plugged up filter (original, probably filled with debris after using Jectron and Cataclean in combination), or a FPR gone bad. Hence, getting a Hengst!

I should have bought a Mahle, but I try to get good but cheaper OEM quality parts if possible.





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