Q: Q: Cold engine problems

asked by on

My car has an automatic transmission. Lately, it's been having some problems running when the engine is cold. When it warms up, it runs fine. When I'm stopped in the traffic with the engine still cold, the RPMs would go up and down, which resolves itself upon warming up. Also, when I'm stopped in the traffic and am about to keep driving, the engine would hesitate and for several seconds until it finally gathers power and speeds up. While this is happening, I can floor the gas but the acceleration is really sluggish. After this, the car would shift well and run okay. What might be causing it?

There are numerous potential causes for the problem you are having. One thing that comes to mind is a failed engine coolant temperature sensor (ETC). The ECT does exactly what it sounds like - it monitors engine temperature. The ECT’s input to the powertrain control module (PCM) affects the entire engine management operating strategy. Many of the engine’s fuel, emissions and driveability are directly affected by ECT operation. This can result in driveability issues such as those you are having. The first step in diagnosing your vehicle is to retrieve any stored diagnostic trouble codes (DTCs). These codes serve as a starting point for any further diagnosis. A professional will be able to do this and diagnose your car’s acceleration issue. I suggest you give the team at YourMechanic a call since we come to your home or place of work.

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. Q: Cold engine problems

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: Car is making a popping sound when I turn the wheel. Most noticeable when I turn right

What you are describing sounds like a failing CV joint. A CV (Constant Velocity) joint is a shaft that connects the transmission to the wheels, essentially transferring the power from the drive train directly to the wheels. The CV joint...

Q: Why would my car have a delay in acceleration in my 201 Acura CL

Hello. It sounds like you either have a failure in the throttle body or a problem with the throttle body position sensor. If the throttle body itself is failing then the throttle plate may be sticking so I would inspect...

Q: Car stalling at first start, black smoke from exhaust

Hello. There are a few possibilities for why your car is stalling when you first start it. Your car’s coolant temperature sensor could be sending the wrong information to the PCM, which will cause the PCM to send the wrong...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.