Skip the auto shop - Our mechanics make house calls

Q: Evaporative Emissions Control

asked by on

when I excelerate about 45-60miles per hour it sounds like a whistles like a plane taking off and also when i decelerate sounds like a plane landing the same whistling it idols just under 1000rpm does not over heat. has maintenance light on.engine sounds really rough. The smell of hot humid water when I use my defroster. I checked all fluids. They r good. Then today after getting gas. It acted like it didnt want to start wanted to stall.It all started 3 days ago. Please help. A.S.A.P. thank you. Female traveling the u.s.

My car has 154000 miles.
My car has an automatic transmission.

Hi There, It sounds like you may have a couple of separate issues going on here. The hot humid water smell indicates you may have a leaking heater core. The [heater core]((https://www.yourmechanic.com/services/heater-is-not-working-inspection) is a small radiator like unit that circulates the hot coolant from the engine through the heater core which then uses this warm coolant to heat the inside of the car with the help of the blower motor that blows the warm air through the vents inside the car. The other possibility is that the thermostat may not be allowing the engine to reach a normal operating temperature and since the engine’s warm coolant is the essential source of the heater core supplying heat to the inside of the vehicle, this can impact the warmth of the heat inside the vehicle.

The stalling after refueling typically indicates that you may have a problem with your evaporative emissions control system. Your car has a small purge valve with a purge solenoid in the Evaporative Emissions system that controls the venting of fumes from the fuel tank as these fumes build up inside, particularly when you are refueling the car with gas. The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system collects and temporarily stores the fuel vapors in the charcoal canister. The charcoal canister is filled with activated carbon pellets that can absorb the fuel vapors. When the engine is running, the fuel vapors are purged from the canister and burned in the engine. The vent control valve (solenoid) controls the flow of outside air in and out of the charcoal canister. The vent valve is controlled by the engine computer (PCM). Normally the vent valve is open. It closes when the engine computer tests the EVAP system for leaks. If a leak in the EVAP system is detected, the Check Engine light will illuminate on the dash and the trouble code related to the problem will be stored in the engine computer. When an air leak is present in the EVAP system, the MAP sensor will not be able to determine the air density, and the MAF sensor will not be able to determine the volume of air, entering the engine correctly. This will lead to an over fueling situation or an under fueling situation depending on the size of the air leak and engine operating speeds and load. This may eventually lead to catalytic converter problems as well as misfiring problems. I would recommend having an expert from Your Mechanic come to your location to diagnose and inspect your vehicle.

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!

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: Climate control is not workkng

You will need to see what component blew out all the refrigerant out of the A/C. In the process, it may have blown a fuse to the A/C causing no blower or compressor to come on. If you seen smoke,...

Q: Got gas and now the car stalls out

Hello, What you are describing sounds like a commonly known problem related to the evaporative emissions system. Your car has a small purge valve called a purge solenoid in the Evaporative Emissions system that controls the venting of fumes from...

Q: SMG transmission cannot be put into gear, fluid leaks

Hello. It sounds to me like the problem was either misdiagnosed or improperly repaired. If the problem was misdiagnosed, the issue would still be occurring because it was never addressed in the first place. If the problem was improperly repaired,...

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...
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...
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...