What can cause rev hang?
Rev hang tends to be an issue with electronic throttle bodies because of emissions, according to Fenske. They are usually programmed to cut fuel and delay throttle closure when the driver lifts off the right pedal, in order to maintain a consistent air-fuel ratio for emissions purposes, he said.
How do you get rid of rev hang?
Elimination/reduction of the rev hang is possible by modifying software in the ECM. There are various after-market companies offering “tunes”, predominantly for the purpose of improving performance by increasing power.
What is a rev hang?
Rev hang is a delay in engines revs decreasing when you lift off the throttle. It occurs on most modern internal combustion engines, but is more noticeable on manual transmission equipped cars because you are in complete control of shifting.
Do automatics have rev hang?
Cars fitted with automatic transmissions suffer the same rev hang problem as cars with manual gearboxes but drivers are much less aware of it because of the design and function of the auto ‘boxes, especially those fitted with torque converters.
Is rev hang good or bad?
Rev hang can be a nuisance but also has real-world benefits. Here’s everything you need to know! When you dip the clutch in a car, the revs will drop. This is due to the inertia of the flywheel, and the lack of air going in the intake as the throttle is release.
Can you disable rev hang?
With a quick reprogramming of the throttle body control codes and a bit more competence when it comes to checking oil levels, rev hang can be eradicated and your gear changes can be as smooth and as quick as you desire.
Why do modern cars rev hang?
Since modern cars have electronic throttle bodies, the car’s ECU can delay how much the throttle actually closes, despite your foot being all the way off the throttle. This throttle delay is what causes rev hang.
Why rev hang is bad?
That extra fuel causes a rich air-fuel ratio, which is bad for emissions. Since modern cars have electronic throttle bodies, the car’s ECU can delay how much the throttle actually closes, despite your foot being all the way off the throttle. This throttle delay is what causes rev hang.
Why do people hate rev hang?
What kind of problem does a VW Jetta have?
I have a VW Jetta 1.4tsi 122 (2008) and it has a strange behavior. First of all, a have noticed that it doesn’t keep the same rpm when runs on idle. For example, when I stop at the first traffic light it runs at 600rpm and at the next traffic light it runs at 1000rpm.
What to do if your Volkswagen Jetta is stalling?
Before troubleshooting any automotive issue, including stalling issues with the Jetta, make sure that you check the vehicles trouble codes with an OBD2 scanner. Trouble codes are always a great place to start diagnosing problems on today’s modern computer controlled vehicles. Without them, you are in the dark. These codes are vital to diagnosis.
When does a VW Jetta run at 600rpm?
For example, when I stop at the first traffic light it runs at 600rpm and at the next traffic light it runs at 1000rpm. Also in the morning when its cold it keeps 600rpm and when the temperature rises to 90deg it climbs to 1000rpm.
Where is the throttle position sensor on a VW Jetta?
Your Volkswagen Jetta uses a series of complex sensors to report what is going on to the ECU. The ECU then uses this information to adjust the timing, air fuel mixture, and more. When one of them goes wrong, it can lead to stalling for sure. Throttle Position Sensor – The throttle position sensor is typically located on the gas pedal.