Question about Lexus LS 400

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My 96 ls400 was garaged for 4 yrs. with little gas in the tank. Now, the car was very rough. I have replaced all plugs and wires. Still rough. I got code PO300. Misfire on 1,2,3,5,6,7 cylinders. What could it be the problems? Could it be the injectors. I wanted to replace the fuel filter, but where it is located at?

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  • jtndevelopme May 25, 2011

    Before the car was stored, the car runs smooth, no problem at all, Do you think it could be the injectors? If I try to clean the injector with Castle FireBall, how much do I need to use?


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First. Storing anything that is Gasoline powered for a long time ( typically over 6 months) should have a full tank of fule with Stabil or simmilar product in the tank and fog the engine. ( inducing a engine fog according to product lable)
As for your car I show that the Lexus LS400 has no external fuel filter. ( Poor Choice by Toyota in my opinion) the only filter that AllData shows for your car is in the fuel tank. If you have not *** of yet. I would find a place that sell Castle FireBall. It is the best injector and fuel system cleaner I have found. Try that first. If no luck you may have to try a professional injection cleaning. That would be my first try, if you have ruled out vacuume leaks. Letting a car sit can also cause dry rot of vacuume lines. Look it over good. Spray carb cleaner while engine is running on vacuume lines and see if you hit a spot where engine smooths out. if so that is a sure sign of a vacuume leak in that area.

Posted on May 24, 2011

Testimonial: "Thanks for the tips. I will try to use the injector cleaner and see what will happen. So far, I could not locate Castle FireBall. "

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