BMW E66 - 2007 750Li Engine Stall On Hard Stops

[Bahmboo757]

Good Day All,

BMW E66 - 2007 750Li Engine Stall On Hard Stops

Issue has occurred 3 Times in the past 4 Weeks.

Recently had Valve Cover Gaskets; Alternator Seal done.

Thanks in advance.

[Critter7r]

Sound like something caused by vacuum issues. Either a leak, or the engine isn't producing enough. Off the top of my head, I can't remember if that engine has Valvetronic, but if it does, the vacuum pump may be drowning in oil and not producing enough vacuum to begin with.

[Bahmboo757]

Thanks for the response. I will throw that in the hat with my Repair Shop. Initial discussion with them was that it could be the Intake Boot having a slit in it causing un-metered air. This particular thing is under warranty with them as they did work associated with the Intake Boot when my valve cover gaskets were done back in October of 2018.
I will check my extended Warranty coverage options for the Vacum Pump.

Thank you so much.

[Bahmboo757]

Quick update.

Thank you all to those who provided some feedback.

Issue was found. A smoke test was done by my local BMW Independent Service Shop; they found smoke coming out of a Hose that had come loose from the Vacuum Pump; hose is about 3 feet long. Don't know how long the hose had been loose from this connection and I don't remember where they said the hose leads to from the Vacuum Pump. New hose was installed as the previous hose was dried and brittle on the ends which made it difficult to cut down and re-use again.

Total cost to me: $40.50 US.

Substantial difference noticed in braking performance and issue has not occurred since.