Emissions test failed with a new gas cap

ANSWER : Hey there. This may be related to other possible malfunctions in your EVAP system, such as a faulty vent valve solenoid. 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. When this solenoid is not working properly, this may cause the tank to fail to expel the vapors as it is designed to causing the failed emissions test. If you would like to have the car scoped out, a certified professional from YourMechanic can conduct a comprehensive diagnostic on your car before you take it in for another emissions test.

ANSWER : If you need a gas cap, especially if you are trying to resolve what you believe might be a cap related fault, use an OEM (dealer supplied) cap. Using a genuine OEM cap of the design supplied when the car was built is the only way you can guarantee that a replacement cap (even if "new") is not still a, or "the", problem. Aftermarket caps are often not identical to the OEM caps. Once you have a genuine OEM cap, if the cap is not clicking once tightened, there could be a problem with the threads on the fuel filler neck or other filler neck defect that will have to be resolved. I recommend that you request a gas cap inspection/diagnostic. A certified Mechanic, dispatched by YourMechanic right to your location, would then get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

ANSWER : Hi there. To remove the gas cap that broke off, get a pair of needle nose pliers and use it to remove the gas cap. Try to locate a part of the gas cap that you can grab with the needle nose pliers and turn the gas cap as if you were to take it off. You may need needle nose vice grips for a stronger hold. If you need further assistance with your vehicle, then seek out a professional, such as one from Your Mechanic, to help you with removing the broken gas cap.

ANSWER : Hi there. When the fuel cap is not securely fastened to the tank, it can create vacuum issues inside the tank; which triggers the error code to be stored in the ECU. The error will then trigger the check engine light until that code is reset by a professional digital scanner. If you’re still having sputtering or stalling issues, you should contact a professional mechanic to complete an engine sputtering inspection. This will allow them to diagnose what’s causing this problem and reset any error codes to hopefully correct the issue your Chrysler 300 is experiencing.

ANSWER : It is possible the tank was filled too much, that is the gas pump did not shut down when it should. Even if gasoline was not filled right to the top, thermal expansion can later cause the gas to overflow if the tank gets warmer and pressure builds. The too high level will subside quickly as all you have to do is drive 25 miles or so to lose a gallon. If you believe there is a leak or other issue, a certified Mechanic from YourMechanic can perform a leak inspection during a mobile visit.

ANSWER : Hi there. Unfortunately, there is no black & white step for removing a broken gas cap. If the gas cap is stripped or spinning around, it has to be carefully drilled out. This should be completed by a professional mechanic to avoid mistakes and debris falling into the fuel cell. If you live in one of our service areas, one of our professional mobile mechanics can come to your location and complete the gas cap replacement.

ANSWER : Hello, yes, it is ok to put unleaded gas as well as E-85 fuel in your vehicle. The vehicle has the ability by way of the computer to calculate the type of fuel and control fuel ratio to get the best operation.

ANSWER : Hi there. Change out the spark plug wires, put sea foam in the vacuum system to clean the internals of the engine and change the oil and filter. Then drive the vehicle around and fuel up with Techron fuel.

When you go to the emissions station, run the engine hard, but not enough to damage it. This gets the catalytic converter hot and makes it work real good. When in line, do not shut off the engine and keep it running. Try to be the first in line if possible or early in the morning when the line is short. This will help with after driving around hard. Your truck should pass emissions with a good outcome.

If you need further assistance diagnosing your engine, then seek out a professional, such as one from YourMechanic, to inspect your exhaust system and help you with preparing for the emissions test.