Skip the auto shop - Our mechanics make house calls

Q: Running rich, won't start when hot

asked by on

My car seems to run fine until i turn it off and try to start it again when hot. It turns over fine but takes a few second to actually start. One started again it runs well. When I turn it off when it's hot i can smell the gas from running rich and there is a puttering sound for a couple seconds. I replaced the coolant temp sensor which didn't help.

You most likely have a leaking fuel injector or purge control valve. Check the purge control valve to see if it is not sealing when it is off and letting gas fumes into the intake and flooding the engine with fumes. If it is not leaking then you will need to have the injectors cleaned and see if it stops the problem. Otherwise, you have a leaking injector that needs to be replaced. If you’d like to get this fixed, have a technician check your car for any leaks firsthand for an accurate repair.

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: I have a bad oxygen sensor, bad power steering sensor, and a bad cam shaft sensor? Should I replace any of them?

When you say you have three bad sensors I can only assume you have had them tested and the end result is three bad sensors. If they tested bad then they should be replaced. The power steering sensor senses the...

Q: Haven't driven car in 2 years and I need to smog it to validate my registration

Buy a brand new battery that is fully charged prior to installation so that you do not needlessly load the alternator. Change the engine oil and filter. Ideally, you should pressurize the oil system prior to starting, otherwise you will...

Q: rough start, runs well, after it warms up

Hi there. The OBD-II Code P0174 indicates that there is a lean condition detected by the Engine Control Module (ECM). A lean condition will be created if there is too much air, and not enough fuel, in the air fuel...

Related articles

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...
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...
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.