It is most certainly possible that the new vanos was not installed exactly the way it was originally. It can all be tested via the dis machine. It's also quite possible that your old vanos unit was giving too much and what you have now is where it should be. It's hard to say. If the vanos was installed properly it should be working properly. Normally you would notice if it was wrong.. it would run pretty bad. Take it back and have them reinstall everything and reset, then test it.
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