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.

A: Hi. This problem is most likely caused by a...

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

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: Truck won't start after warming up

You need to check the purge valve to see if it is leaking vapor into the intake when at idle and when the engine is off. If it does then it may be bad and needs to be replaced. Check...

Q: My car shut down after it running 'loud' for about 20 miles, steering stopped working once I took exit and wouldn't turn back on.

It sounds like you have a belt that failed. It is common for the serpentine belt tensioner to fail and cause the belt to come loose on the engine. This will cause the voltage to become very low due to...

Q: My car won't turn over and I can't smell my petrol - I have replaced my fuel pump and starter motor

Hello - check fuses of course. Still, this issue is probably a higher-level component failure, since both cranking and fuel supply are not working. Most likely failures are the ignition switch, or the alarm system. I would recommend having a...

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...