Purge valve? Vent valve?

 

A good indication that the issue is the purge valve (solenoid) is that you state the engine vibrates and hesitates on startup.

That indicates the solenoid is stuck open - allowing fuel vapors to be drawn into the engine upon startup and causing a rich or flooded condition.

The valve is designed to open and draw fuel vapors into the engine once the engine startup is stabilized and the vehicle is being driven (not at idle).

 

Also bad temp sensor. Had that in my SUV. Always running rich. Ecm thought engine was cold all the time

 

Purge valve. Replace it ASAP.

 

Were any of the posts helpful?

 

A good indication that the issue is the purge valve (solenoid) is that you state the engine vibrates and hesitates on startup.

That indicates the solenoid is stuck open - allowing fuel vapors to be drawn into the engine upon startup and causing a rich or flooded condition.

The valve is designed to open and draw fuel vapors into the engine once the engine startup is stabilized and the vehicle is being driven (not at idle).

Were any of the posts helpful?

Have a 2019 Impala that is throwing code P0442. The problem I’m having is after I get gas, that’s when it will vibrate and hesitate on startup. Any suggestions? I’ve already changed out the gas cap and it didn’t help.

I had the same problem on my 2014 Impala I use my code reader to erase the code never came back on it been 2 years already no problem since then .....

 

It's a vague code, could be anything from a gas cap to a purge over the tank. One is $15, the other a LOT more. For what it's worth, I run Lucas FI cleaner in all my cars, about every 4th tank. Never have these problems anymore.

 

get a bottle of liquid Heat at the parts store fill up with premium gas. If that does not help on your next fill up use a bottle of fuel injection cleaner.

 

I have a 2019 chevy impala premier, the dealer has now replaced the purge valve for free 3 times in the past years because of a special coverage. They know it is a problem

 

Welcome to the forums.
I wonder if they changed the related bits too.

 

Code P0442 indicates a small EVAP system leak, and since the issue occurs after refueling, the problem could be with the purge valve or vent valve. A faulty purge valve can stick open, causing a temporary rich condition and rough starts after fueling. Try checking the purge valve for proper operation or replacing it. Also, inspect EVAP hoses for leaks. If the issue persists, a smoke test might help pinpoint the leak.

 

Code P0442 indicates a small EVAP system leak, and since the issue occurs after refueling, the problem could be with the purge valve or vent valve. A faulty purge valve can stick open, causing a temporary rich condition and rough starts after fueling. Try checking the purge valve for proper operation or replacing it. Also, inspect EVAP hoses for leaks. If the issue persists, a smoke test might help pinpoint the leak.