My vanos is stuck on

[hoveringuy]

VANOS will be engaged when the motor has warmed a little bit and under load until around 5200 rpms. If I rev my motor hard while parked my "V" light will light (VANOS), so I don't think road speed is involved.

ECU will complete a ground to the solenoid. Solenoid should always have +12 volts with ignition.

How do you know what the VANOS is doing?

[JGood]

The computer needs a road speed signal before it does anything with vanos AFAIK, which is why you need the wire from the back of the cluster that goes to the pin 20 of the x20 connector

That's the thing, the computer IS doing something with vanos, it's engaging it permanently. As soon as the car starts, it sends the signal to vanos to engage.

And I do have the road speed signal hooked up. Proof of that is my ability to rev to 7000, I think? Because with no speed signal aren't you in limp mode, with a rev limit of ~6300?

I'm going to try my old chip today, just to be sure it's not that.

[Dissembler]

The computer needs a road speed signal before it does anything with vanos AFAIK, which is why you need the wire from the back of the cluster that goes to the pin 20 of the x20 connector

[JGood]

I guess my questions are:

Does the DME use any info to determine vanos engagement other then RPM? Could another sensor (knock, for instance) that has an out of spec reading, cause the DME to advance timing at all RPM's?

Could the DME be bad in a way that would cause normal operation, except for this?

[JGood]

Another...

[JGood]

I am always getting power to it. The solenoid and all other vanos components work as supposed to.

The DME should provide 0 volts until ~1k PM's, then provide 12 volts. This activates vanos. Then The DME cuts the 12v supply around 5.5K RPM's, which deactivates vanos.

Here is the wiring diagram. Actually, it looks like the DME actually cuts the ground supply to the sensor, as opposed to cutting the positive supply. Positive comes from the main relay.

[M-technik-3]

So your saying the solenoid is defunct or you are always getting power to it? Just wanting to make sure I understand you correctly.

[JGood]

So my vanos is stuck on. I have 12v coming from the harness at all RPM's, as opposed to just ~1k to ~5.5k. What would cause my ECU to not deactivate vanos? I'm losing top end power, when I unplug the vanos and drive it, I have no low end but it screams up around 6k.

It's a 94 e34 m50 with s50 cams and a TRM tune.