Q: Floods bad when cold runs great when warms up

asked by on

When I first crank it up won't hardly run floods bad when it warms up it runs great the colder the weather the worse it does. Ok

My car has 136000 miles.
My car has a manual transmission.

Hi. This problem is most likely caused by a faulty coolant temperature sensor, which is sending a signal to engine management that it is colder than it actually is. This causes engine management to inject more fuel than is needed for the cooler temperature, making the engine run rich or flood. This temperature signal misrepresentation is less of an issue as the engine warms up, although it is probably still running a bit rich. If you need further help having this addressed, a qualified pro from YourMechanic can come to your car’s location to inspect the rough running issue and guide you with accurate repairs.

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. Floods bad when cold runs great when warms up

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: Driver's side windows do not properly function

If removing the driver door window switch (or the driver-side console switch), and applying direct power to the harness yields successful operation of the window, the problem is the switch that was removed for the test. This can be confirmed...

Q: Engine won't even try to start but all the lights turn on and battery is fine.

Hey there. One of many components can cause a no crank condition. A bad ignition switch can be a cause. If the switch does not send a signal to the starter, nothing will happen when you turn the ignition to...

Q: Car cranks but won't start - 2001 Pontiac Firebird

Simply put, the engine only requires three things to start: fuel, air, and gas. The car is likely not receiving one of these in the right amount or at the right time. You can do some simple tests to help...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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...