Skip the auto shop - Our mechanics make house calls

Q: Evap system problem

asked by on

When the engine is cold it starts right up. After it gets to operating temperature if I shut it off, ex. Getting gas, I try to crank it, it sits right back off. I have to hold the accelerator and hold until rpm gets to normal range. When this happens and it stays running the rpm will go up and down by 200 to 300 rpm. New maf sensor, tps sensor, coil packs, even fuel filler neck. My scan tool shows "evap system vent door circuit open". Do you think a new vent door solenoid will do the trick? Please respond at djanarking. thank you very much

My car has 155000 miles.
My car has an automatic transmission.

A: It sounds like you have a problem with the ...

It sounds like you have a problem with the vapor vent purge valve. Check the valve to see if it will hold vacuum when not energized or if it leaks and needs to be replaced. The valve leaking will cause hard starts and rough running until the excess fumes are cleared from the engine. I recommend checking the system by a mechanic to diagnose the car’s stalling problem for you.

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: Oil leaking all out under front end

It sounds like the oil pan ruptured or tore from an impact. The crankshaft is above the pan and probably is not damaged however there is an oil pick up tube and screen assembly in the lower oil pan area...

Q: Car overheating, battery light on, and can't steer my wheel properly. 2001 Pontiac Grand Am

Hi there - your symptoms could indicate a failure of the serpentine belt - aka accessory belt - which drives the alternator, power steering and water pump. If the power steering pump seized or caused excessive drag on the belt,...

Q: Low heat

Hi There, You may have a clogged heater core that may be prohibiting the outer linings of the heater core to get hot. As you know, the heater core is a series of tubes that the coolant runs through that...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...