Q: RPMs very low

asked by on

The RPMs are really low, and the engine is shaking.

It sounds as though you may have a vacuum leak. A vacuum leak is simply unmetered air that is allowed to enter the engine and disrupt the air/fuel ratio. This can cause many symptoms including a rough, low idle. There are a handful of methods used to locate vacuum leaks. The best method, which professionals use, is a smoke machine. The machine is hooked up to a vacuum port and forces smoke throughout the system. Smoke can be found escaping from the location of the leak. I suggest having a professional inspect your vehicle firsthand with dedicated equipment to diagnose your vehicle’s low RPM and vibrating issue and determine what repairs are appropriate.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. RPMs very low

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Loud noise from engine when starting

Hello. There are many components that can fail and cause an internal engine noise. On your car the most common is either a failure in the camshaft, this would cause a loud ticking, or a rod bearing which would cause...

Q: Leaking inside the car after the rain

A few things can cause water to leak into the car. The most common would be the windshield leaking through, bad door or window seals, an AC evaporator core leaking, or one of the body seams allowing water to pass...

Q: Performance issues when driving and idling, RPM dropping abruptly

The symptoms you are describing are almost always caused by a bad catalytic converter. When this fails it clogs the exhaust, which causes these problems to occur. Do a back pressure test on the exhaust first. If that is fine...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...