What causes rough idle when cold?
What causes rough idle when cold?
While there are many potential causes for shaky cold-weather performance, two of the most common are failing engine temperature sensors and bad thermostats. In both cases, the underlying reason for a rough idle is an overly rich air to fuel mixture.
Is it normal for a car to run rough when cold?
It is not normal for the car to run rough when it is cold. This could be a sign that the car needs a tune-up and may also need a fuel system flush. The spark plugs, and ignition coils should be replaced as well, since the car is 16 years old.
What causes rough idle and acceleration?
Ultimately, everything from the ignition and fuel injection systems, to valves and pistons can cause a rough idle. A few of the most common components include: If clogged or gummed up, the injectors don’t provide the right mix of fuel and air, resulting in a rough idle or slow acceleration.
Why does my engine run rough at idle?
Many different problems could result in a rough idle for your car or truck, including: dirty fuel injectors, clogged air filters, bad spark plugs, and a variety of exhaust system issues.
Why does my focus shake?
Any unusual shaking or vibrating forces coming from the engine is cause for concern. It could be something as simple as old spark plugs producing an uneven power delivery, it could be something serious like worn or broken engine mounts, or it could be even more serious in the case of internal engine damage.
What causes a Ford Focus to run rough at idle?
Updated January 17, 2018 When a Ford Focus exhibits problems with running roughly at idle speeds, auto mechanics generally look first to either a vacuum problem, or more often, a problem with water getting into the Differential Pressure Feedback Sensor (DPFE), a part of the EGR (exhaust gas recirculation system).
Why is the Ford Focus’s EGR pressure gauge not working?
With the Ford Focus in particular, the problem may be caused by water getting into the DPFE sensor, interfering with its ability to accurately gauge pressure changes in the EGR system.
Why does my Ford Focus not pass emissions test?
If you live in a state with vehicle emissions testing, this may be the reason why your car fails the test. With the Ford Focus in particular, the problem may be caused by water getting into the DPFE sensor, interfering with its ability to accurately gauge pressure changes in the EGR system.
