Idle

when i start my 1500 dodge ram rpm goes up and down in morning

when i start my 1500 dodge ram rpm goes up and down in morning
  • 3522
  • Edward King
  1. Why does my car revs up and down when I start it?
  2. What causes high idle at startup?
  3. Why is idle speed increased during cold start?
  4. Why are my RPMs so high at idle?
  5. Can bad spark plugs cause surging?
  6. What should my rpm be at 0 mph?
  7. Can a dirty air filter cause high idle?
  8. Can a bad 02 sensor cause high idle?
  9. How many RPMs is too high?
  10. What RPM should my car be at 70mph?
  11. Is 1000 rpm idle bad?
  12. What is a normal rpm when accelerating?

Why does my car revs up and down when I start it?

Common causes of high RPM excursion at start-up are typically: large vacuum leak, throttle plate stuck open, cruise control stepper motor stuck in one position; faulty throttle position sensor, and/or faulty idle air control motor or solenoid.

What causes high idle at startup?

The most common problem is a faulty fuse. In modern vehicles, engine idle speed is most often controlled by the idle air control (IAC) motor. This can be impacted by bad fuses in many different electronic systems in your car. Next, your high idling could be caused by a computer malfunction.

Why is idle speed increased during cold start?

When a cold engine is started, a component called the auxiliary fuel injector sprays additional fuel into the intake manifold. The extra fuel helps the engine start faster. ... So, the throttle valve opens to raise the engine's idle speed. That's why you see the engine idling at 1500rpm or even higher.

Why are my RPMs so high at idle?

If the computerized engine control system is faulty, high idling can be one symptom. A vacuum leak in any of the hoses can be the culprit—inspect them all for leaks. A bad idle-speed control unit can cause the problem; it may need to be replaced. A faulty alternator can fast idle issues; if so, replace it.

Can bad spark plugs cause surging?

3. Surging and Lagging. Another good indication that your spark plugs are dirty or worn is if your vehicle experiences surges of speed, resulting in a jerking acceleration. These surges occur because your spark plugs are not igniting the fuel in your engine at the proper rate, resulting in an uneven speed.

What should my rpm be at 0 mph?

For a zero reading your engine must not be running. Most engines idle at between 600 to 900 RPM.

Can a dirty air filter cause high idle?

It is just as important for your engine to get enough air, as it is for it to have enough fuel. A clogged filter will reduce the flow of air into the engine, causing a rough idle. It may also increase your fuel consumption.

Can a bad 02 sensor cause high idle?

Yes, a bad O2 sensor can cause a high, or rough, idle. The oxygen sensor output is part of the systems that control engine timing, combustion intervals, and the air to fuel ratio. When it starts to go bad, it can cause rough idling, loss of power, hesitation, or stalling.

How many RPMs is too high?

I would say anything up to 9000 rpm should be fine. That's why they call it redline. If 7750 was its safe limit then that would be the redline. Now 10000rpm might be considered as unsafe.

What RPM should my car be at 70mph?

Generally, the average car stays at about 2500 rpm while doing 70mph.

Is 1000 rpm idle bad?

In most of today's cars, an idle speed of 600 to 1000 RPMs is average. If your car is idling rough, though, it won't feel smooth. ... Rough idle is easy to detect when you start your vehicle, and it may be dependent on the engine temperature when you start your car.

What is a normal rpm when accelerating?

Whenever possible, try to avoid hard or sudden acceleration to high speeds so that you prevent your engine from damage caused by over-revving. Step 4: Maintain fuel efficiency. For the best fuel efficiency, keep your RPMs between 1,500 and 2,000 RPM when driving at a constant speed.

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