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Subject: Re: Past the 500 mile mark. Bad news
Author: rajaieq as Rajaie (moderator) : 156 posts
Posted on: 2008-06-26 20:59:05

A CPS failure will usually produce a fault code and engine light. You would also likely experience other failure symptoms.
I don’t know a way to check the CPS sensor. I suppose you could connect an oscilloscope to the signal and inspect it. It should be periodic.

Actron is a popular OBDII code reader. There are several models.
Autoenginuity provides a PC (laptop) based software OBDII product. It's a high end solution that provides more detailed OBDII information, like long term fuel trim adjustment values.

Reading your fuel trim adjustment values might provide important diagnosis information to help address your likely problem.

The CVV is located under the air intake manifold around cyl 2. It can't be seen from above. It can be seen from below the car.
Remove the driver side engine cover. This will uncover the intake manifold. The vent hose on the front corner of the valve cover goes down below the intake manifold and connects to the CVV. Another hose connects to the CVV and comes up through the intake manifold around cyl 2. The CVV and 4 associated hoses are made of plastic that easily brittles and cracks from the hot engine gases running through it. This creates a vacuum leak.
You can visually and physically inspect the CVV hoses for cracks. On a cold morning cold start you might hear a whistle coming from the location of a crack. While the car is idling, you can remove the oil fill cap and place your hand palm over it. You should feel a slight vacuum.
I don't know of a definitive way of detecting a crack in the CVV and associated hoses. A smoke test, performed by a mechanic, is meant to locate a vacuum leak. I don't know if a smoke test will catch all possible CVV and hoses cracks.
The CVV and hoses repair procedure is unfortunately not documented in the BMW TIS or Bentley repair manual.

One thing I didn’t mention before is to clean your idle control valve. Remove the ICV and spray clean it with brake or carb cleaner. This won’t improve your performance, but it might resolve your idle problem.

Rajaie
528i 5sp 06/00

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