Skip the auto shop - Our mechanics make house calls

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?

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!
  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: My engine is knocking

When your car begins to knock due to a lack of oil, this could mean many different things, such as broken or bent valves, a bad camshaft, rod or main bearings, and many other different things. As you may know,...

Q: Engine start to tremble when pressing gas. One time the engine light started flashing.

Hi Stephan. Thanks for taking time to contact us today in regards to your Nissan Altima's issues. Anytime the engine or warning light illuminates, it's due to an error code being created by one of the multiple fuel, ignition or...

Q: Van not starting - 1996 Ford E-150 Econoline Club Wagon

The fuel pressure would need to be checked to see if the fuel pump relay or pump has gone bad. The relay is near the battery under the plastic cover with the computer relay. If you would like, a certified...

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...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...