Question about 1991 Lexus LS 400

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Acted like out of fuel but still idling. After playing with accererator awhile to keep running(it surged some while doing this)it finally started running properly

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You probably have a dirty fuel filter. See if replacing it helps because it could shut down on you at anytime if it sucks up the dirt.

Posted on Jul 03, 2010

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What causes car to stall when u give gas real fast but runs fine when u idle it up slow and hold it at 2000rpms and then takes awhile to start sometimes??


when you accelerate real fast you are getting the CPU to allow large amounts of fuel into the chambers to be burnt. Un fortunately if everything else is not prepared for this surge of fuel it puts the fire out as combustion requires a ratio of 14.1 to combust properly. When you accelerate slowly the faulty sensors struggle to keep the ratio right. So run the fault codes and check which sensors are failing .

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IS THERE AWAY TO BYPASS THE FUEL FILTER SO THE CAR WILL RUN UNTIL WE CAN GET A NEW ONE. THE CAR WILL NOT STAY RUNNING. HAVE TO HAVE YOUR FOOT ON THE GAS TO START ONCE YOU REMOVE YOUR FOOT FROM THE GAS...


Are you sure that bypassing the fuel filter will solve that problem? I would not recommending doing so. If you bypass the filter then any trash coming in through the fuel will clog the injection ports. And then the car will absolutely not run. Cleaning injection ports are mighty expensive. If you suspect trash coming into the fuel, purchase a few fuel filters... about three. They are not expensive and are realitively easy to replace. If a new fuel filter helps the car run, then great! Just replace it again when the car starts stalling. Eventually, all trash from the fuel will be filtered out.

However, I do not think that a simple filter would effect the idling of the car. The idle can be adjusted, though I do not know how on your specific car. Also, you may have a faulty throttle position sensor.

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