Question about Hyundai Motor 2004 Sonata
I believe you have a canister purge valve that is stuck open.
This valve controls the flow of fuel vapors out of the carbon canister.
Normally the purge valve only opens when you are underway with the engine running.
If the valve sticks open all the vapor from the fill up is entering the engine and flooding it.
The purge valve is mounted on the engine at the back side near the firewall.
Also...NEVER overfill the fuel tank. Gasoline can enter the carbon canister and saturate the carbon. If the canister is saturated in gasoline it will need to be replaced.
This should fix your issue.
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Posted on Nov 16, 2010
Did you drain the gas tank when you changed the fuel pump? I would try putting some fuel injector cleaner but first try some iso-heet. Also try running some premium in it.It sounds like there may be some issue with the gas. Also I would consider replacing the ISC valve also known as idle air control valve. This valve sticks open and the engine idle will run high for the first minute or two because the engine is cold.
Posted on Nov 15, 2010
The problem is the charcoal filter. This is a very common problem on the Hyundai. The charcoal filter is located down behind the drivers side tire, up in the fender well. The fuel tank is not venting properly. This charcoal filter will need to be replaced.
Posted on Nov 15, 2010
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Posted on Jan 02, 2017
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