Q: Service engine soon light on

asked by on February 24, 2017

Hello, my car makes a rattling noise when i push the gas slowly and car shakes a little. I just had a new alternator, radiator, purge valve, and oil change..Codes p0455 and p1448 are read on machine. I don't know what that is. Car also stalls to speed up it jerks then speeds up. Can you help me?

My car has 168000 miles.
My car has an automatic transmission.

Hi There, Both of these codes relate to your evaporative emissions control system. One relates to a leak that is detected and the other relates to the possibility of too much water vapor in your charcoal canister which is part of this same 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.

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