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Re: Engine lightcomes on when my Sienna sits idling for a...
The fuel system is a pressurized system designed for optimum environmental protection. If the fuel cap is loose it will trigger the light to come on. If it is coming on all the time and you can turn it off by tightening the fuel cap, it's probably time for a new fuel cap. The internal pressure relief valve in the fuel cap itself may have gotten old and is not holding the right amount of pressure or is vibrating loose. Try replacing the fuel cap and seal, and see if this fixes the problem. Make sure you bring the old one in with you to the auto parts store so they can make sure it is an exact match. If the fuel cap is worn out, it may not pass state inspection. (I'm not sure if your state checks for that, but NJ does) Good luck and don't forget to rate! Thank you!
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check vehicle battery connections for obvious corrosion. If none is present, use another vehicle and battery jumper cables-properly hooked up, and with 2nd vehicle idling, try cranking Toyota. If not immediately starting, give it a few minutes to charge toyota battery, and then try again. A fully drained battery will require several minutes charge from second vehicles charging system to sufficiently charge drained battery.
normally to reset a check engine light all you have to do is unhook the battery for a couple of minutes and then hook it back up. if you are having a sensor problem though this check engine light will come back on after you drive the vehicle for more than 3 minutes.
sounds like the idle is to high if it lurches, that is why you hear a clunk, you will need to find out why the idle is to high, may be a bad sensor or idle air control valve, there are no adjustment it is all computer controlled so something is wrong , i would think the check engine light would come on by now, go to an auto zone and have the computer scanned for codes.