I recently got an oil change, then got gas and overfilled the tank slightly and drove a couple of blocks home. The next morning noted the service engine light on...went to Auto Zone. One person said it might be vacuum line, another try came up P140 EGR. I thought I may have caused it by the gas overfill..it is running fine so far, but I always seem to get ripped off by the auto mechanic so hopefully someone can help. Thanks, Barbara. I did try a new gas cap, but it didn't help.
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Knocking sounds could be a couple things, assuming they are coming from the engine compartment:
Badly Frayed Belt smacking around inside the compartment, or (more likely) your engine isn't operating properly. Check your oil levels and make sure they are in the normal range, and if the oil is dirty, get it changed. Try using SeaFoam in your gas tank and run for a little while, and check your spark plugs to ensure they are in good condition and properly gapped.
first drain the contaminated fluids. replace oil filter and put new oil in crankcase. drive a few days and check for moisture. will be foamy white on dipstick. this could foul the plugs or cause white smoke in the exhaust if you can't see behind the vehicle after a couple days change the oil and dump out the filter. the filter could be rinsed out with some gas.
Iown 02 hyundai accent gl 1.6l. Had the problem twice. I used to over fill the tank until I had to spend close to $550.00 USD. The problem is when we overfill the tank. the carbon canister gets clogged and it damages a sensor in the assembly called "DMTL". Thia assy is located under the rear driver side of the car to the left and rear of the fuel tank. Once I replaced the carbon canister, sensor and filter the problem went away. if you let it go for a long time you eventually start smelling gas inside the car after fill ups. Good luck.