Mvinhie

Hi there i have a lexus es300 1997. For some reason i was driving yesterday on the road for about an hour then i notice when i was waiting in traffic the car shut down for no reason and it wouldn't crank back up until i turn the key off and then turn on back again. Today i replace the fuel pump and fuel injector since i suspect there was a problem but after driving around the block turning off the car and turn back on. The car seem like it wanted to start but it end up sputtering. I even switch the efi relay with the horn.What could be the problem?

jltait

There isn't enough detail here for a truly helpful diagnosis, but maybe you have a bad battery and or alternator? Check your battery terminals and make sure they're clean. I had a problem once which was maybe similar to yours. The positive battery terminal was completely corroded. Cleaned it with a wire brush and no more problem.

Alternatively if the car only dies at idle, you may need to clean your idle air control valve. There are a few forums on this thread describing that procedure.

Good luck!

PFB

Just a thought. If you filled it up recently, maybe you got a bad load of fuel. Water in the tank?

BDSL

Try some fuel injector cleaners.