Why is my car slightly revving on its own?

Why is my car slightly revving on its own?

It sounds like you may have a dirty or failing idle air control valve. This valve is controlled by the vehicle’s computer and will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage.

Why are my revs low?

When you notice your car idling low, suspect three common sources of trouble: Faulty or clogged idle air control valve. Vacuum leaks. Ignition system problems.

When does a car over revve but not gaining speed?

When I’m driving along the dual carriage way it takes ages to pick up speed yet the car is over revving. Cars are always over taking me, it’s embarrassing. I’m on the dual carriage way barely reaching 30mph at times. When it finally reaches 40 I up the gear to 4th. Thinking about it now the over revving seems to happen when i change gear.

Is there tip lag on a VW Passat?

The “tip lag” has been around as of this writing for 10 years. Audi has it, VW has it, BMW has it, Porsche has it and I assume Mercedes has it and so on. Versions of these cars were released that did not have it, however.

Is there a problem with the Volkswagen DSG transmission?

The mechanic has specified a DSG software upgrade to correct this which is due to be done shortly under warranty. Are you aware of this being a common problem with Volkswagen DSG transmissions and how confident are you that a software upgrade will provide the solution? Extremely common and the subject of a Worldwide recall.

What to do if your VW TDI loses power?

If you are not sure whether it is bad, simply rev the engine to 5100 RPM while in park or neutral. If the MAF is bad, you will not be able to do it. If the MAF has not failed totally, you should be able to do it. You can also unplug the plug connector. The ECU will then replace the faulty signal with a default value.