HELP- M54 Motor not firing, Vanos advice

[Bulk]

Sorry mate sounds like complete BS to me. If the fuel is "washing the oil off the compression rings" then your piston rings are shot. There should not be any oil in the cylinder at all, ever!

That is one of the design features of the compression rings, they scrape the oil and keep it in the crankcase so placing oil inside the top of the cylinder (on the fuel side) makes no sense and the fact that it worked I think is more a case of coincidence than an actual technical fix.

I read that same thread and the claim by the BMW master tech. I'm still not convinced.....

[SlickGT1]

That is something you do when you rebuild an engine. For some reason my friends engine wouldn't fire up either after he rebuilt it. Don't know why it works. But we were trying to figure out why the car wouldn't starts for two days. Then did the oil trick, and it fired right up.

[Giznaz]

Again, there is no relation between the VANOS and an out of time engine.

The VANOS ONLY activates in the mid range. The valve timing is standard at start up, low idle, up till mid-range RPM's, like 1800is IIRC. It goes back off around 3200 RPM IIRC. It's activated by oil pressure against a piston pressing against a spiral shaft.

It ONLY shifts the cam a few degrees, not enough to cause a no-fire.

If the VANOS is stuck engaged, it may idle poorly, but it would not stop it from runnung.

There is enough spring pressure in the VANOS system, with all the valve springs etc, that even if stuck in the "ON" position, it could not stay there. The camshaft will snap into the "OFF" position all by itself.

Oil pressure activates the VANOS, no oil pressure in that system turns the VANOS off. The oil pressure is controlled by the VANOS solenoid.

[AussieAlan]

Yes Ginaz, you were absolutely right with your advice on the vanos not being the problem with the restart. Thanks once again it saved me alot of worry, thinking I might have to do the seals in the vanos. Bulk, I know it sounds strange about the explanation in the motor "flooding" then putting oil in the cylinders to get the compression back, for some reason it worked. Happy Easter everyone. Thanks for a great forum to get answers.