Skip the auto shop - Our mechanics make house calls

Q: My car is losing power while I'm driving and while idling

asked by on

Morning iv ask a few times what the problem could be with my car. Iv tried all the things that I have been told but problem persists. My car starts first time when I turn the key. There is no warning when the car starts. It's sit at round about 1100 rpm then it slowly drops to the idle position and then acts like it's going to stall. Yesterday I started the car and sat with my foot on the accelerator at 2000 rpm and then it just dropped to a 1000 then picked up again. It also happens while I'm driving. Iv changed the cmp,was sensors also the iac valve. What can I try next.

A: Hi there, this may be an indication of a va...

Hi there, this may be an indication of a vacuum leak. As you may know, when a vacuum leak is present, this tends to cause a lean fuel condition which will generally make the engine idle higher than normal. I would suggest to start with checking for vacuum leaks around the intake. Without additional information as to the make and model of your car and engine, this may be a bit difficult to narrow down without further detail. I would suggest having an expert from YourMechanic come to your home to take a look at your car to diagnose its loss of power.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Rough idle after replacing Mass Air Flow Sensor - trouble codes P0171 and P0102

The P0171 refers to a possible lack of fuel pressure, a leak in the intake air system, or a possible vacuum leak. The P0102 also leans towards a leak in the intake air system. It is possible that there is...

Q: Truck accelerated past 35 and started sputtering

Hello there, thank you for asking about your car. The first thing that comes to mind is a secondary ignition misfire (spark plugs, wires, etc.). An ignition misfire is most noticeable under load and can be felt as a shudder...

Q: Car bucks, jerks, and idles rough - 1991 Ford Mustang

Hey there. This may be a sign of a failing idle air control valve. The idle air control valve is located on or near your intake manifold and monitors the air intake as it is mixed with fuel prior to...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.