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Old 12-12-2012, 03:16 AM
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BMRfanatic BMRfanatic is offline
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Location: South Shore MA
Join Date: Mar 2008
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Mein Auto: Bad Luck 46
Originally Posted by granlund View Post
Yes, I recently diagnosed a friend's car that way.

The electrical wire goes from the solenoid on the front edge of the motor (near the oil filter housing) to a connector underneath the intake manifold. It might be a little bit difficult to reach the connector, but you should see it.

If there is no electrical signal to the solenoid, it will not apply oil pressure to the VANOS piston to advance the cam. However, if the VANOS piston seals are bad (which is very common on older cars), the oil pressure will also not advance the cam and you will experience poor performance.

This is an easy way of diagnosing the VANOS with no cost in parts, nor any measurements.
Just tried it. Good easy to test the vanos.

Now i know why my moms car stalls during cold weather warm ups

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