Why set idle at 1000rpm?
When the car is cold, it will idle at 1000rpm for faster heat up of catylic convertors and coolant . in order to lower emissions, the engine and coolant temp sensor must reach ideal operating temp( 185 to 205degs) quickly. The is the reason in newer car with fuel injection is is ok to start up and go without idling.
What is a healthy idle RPM?
Wrong Idle Speed – Most cars have a proper idle speed, usually between 600 and 1000 RPMs. Idle car speed can change due to wear and tear. Fortunately, an adequate tune-up can restore the correct idle speed.
Why is my VW Jetta running rough at idle?
Really, your Jetta will be running rougher at any RPM, but a misfire will be most pronounced at idle. Spark Plug Wires – While not every model and engine combination of vehicles today comes with spark plug wires (a lot are now coil on plug), if your Jetta happens to have them, they can go bad and cause a rough idle.
What causes a Volkswagen Jetta engine to misfire?
Something is causing cylinders to misfire at random, which is a lot less cut and dry than a cylinder specific misfire code. The P0300 Volkswagen trouble code will trigger the Jetta’s service engine soon light.
What happens if a coil pack goes bad on a Jetta?
These packs are fired by the engines computer at exactly the right time to provide the optimal ignition timing. If a coil pack goes bad, it’ll cause a misfire and rough idle condition. Really, your Jetta will be running rougher at any RPM, but a misfire will be most pronounced at idle.
Why does my VW Jetta have a bad fuel injector?
Your Volkswagen Jetta’s fuel injection system atomizes the fuel into a fine mist. If a fuel injector is not operating properly, it will either let too much or too little fuel into the combustion chamber relative to the amount of air. There are many reasons why a fuel injector may go bad, as well as different symptoms relative to how they went bad.