Q: I have a stutter at idle

asked by on October 01, 2016

My Stratus has developed a stutter at idle. Specifically, when the ac is on. This problem started about 3 months ago and appears to be getting worse.

When the car idles without ac, it sounds good and sits between 900 and 1000 rpm. When the ac compressor kicks on, it drops to 750 rpm and stutters, shaking the car and engine and dropping the idle as low as a couple hundred. It will kill the engine completely if I dont give it gas.

The car runs great and doesnt appear to have any loss of power at speed, even if I'm at a very low speed with the ac on it does great.

Now here's the kicker: it had these symptoms for a couple months and I was told it was the ac compressor. I replaced the ac compressor properly and now have ice cold air, but the problem remains.

I have also replaced the idle air control valve, air filter, spark plugs, oil, and had the battery and alternator tested (both came back perfect).

I'm at a loss for what else it could be. Help!

My car has 169000 miles.
My car has an automatic transmission.

Mass Airflow Sensor Replacement $171.84 - $740.29 Get a Quote

I would recommend checking the mass air flow sensor. As you know this also contributes to the regulation of air flow into the throttle body. If this does not have the proper voltage going to it, this may also cause a drop in rpms since the ECU detects the change in voltage as a change in air flow and will adjust fuel accordingly. I would recommend having an expert from YourMechanic come to your home to diagnose and possibly replace your mass air flow sensors.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

What others are asking

Is it possible to replace the standard Dimension Stereo in a Non Nav Limited with the Navigation system?

Your best bet is to check a website like Crutchfield.com. They have the best information on what systems will fit your car. Attempting to fit an OE Hyundai navigation/radio unit will probably cost a lot more than you think. Also,...

My mechanic said I needed an alternator. He fixed the starter now My car is making this loud knocking noise, what could it be?

Hi there. I believe we answered your question earlier, but if the mechanic is telling you that you need an alternator, it's possible the noise and the power issue is related. The alternator, like many other accessory systems is powered...

I got a 2014 Dodge Charger V6 and I want to put a 6.1L in it, if it’s possible.

There was a 6.4L engine specified for the 2014 Charger but not a 6.1L. To use any engine other than the original engine you would have to completely change out the vehicle's electrical system (the engine computers are different) and...

Knock sensor how long can I driver it knowing the issue

It all depends on the problem the knock sensor is causing. If your engine is pinging when you accelerate then you may damage the piston and valves by driving it. It is not a matter of giving a time but...

What does my car randomly stall/cut out at all speeds and idling in park. in my 2006 Chrysler 300

Hello. It sounds like you have had a lot of work done trying to fix this issue. It sounds like you either have a communication wiring issue or an ignition switch that is failing. I usually test the ignition switch...

BlueTooth Announcing Texts

I would recommend looking in your 2014 Dodge Dart's owner's manual to see if there are any bluetooth programming options available to you. If so, I would just go into the settings menu and change the bluetooth system to not...

Alarm preventing battery installation

Yes, this can be an issue with the Tundra. You should be able to hook up the battery and hit the unlock button and then start the truck to reset the the alarm. The alarm also should reset itself after...

I jus recently gotten a new battery inserted in my car now my car is not starting without it cutting off.

This is your anti-theft system taking over as a result of the new battery being installed. This is unfortunately something that usually requires the dealer to reset due to safety precautions. Often times you will need to establish some kind...

Car unresonsive, dash lights on

Hello. When you get a pedal sensor code on this vehicle then it is usually a pedal assembly that needs to be replaced and the connections at the assembly that need to be checked. If these are fine then the...

Related articles

Symptoms of a Bad or Failing Ambient Temperature Sensor (Switch)
Common signs include a faulty AC auto mode, inconsistent cooling, and incorrect outdoor temperature readings.
Why Won't My AC Blow Cold Air?
When you turn on the air conditioner in your car, you expect to receive a flow of fresh, cold air....
How To Replace a Cabin Air Filter That’s Behind the Glove Box
Cabin Cabin air filters are a new feature found on many late model vehicles. These filters are responsible for filtering the air that enters the vehicle when the heating and air conditioning (AC) systems are in use. They prevent any...