Question about 1999 Lexus ES 300

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ES300 Lexus cylinder misfiring

I have replaced all of the spark plugs, wires and coils and still having the same problem, the diagnostic test is still saying misfire on cylinder 1,3 and 5. The fuel filter has been replaced and the fuel pump was checked and fine. Ran the car down to empty and filled up with gas... ideling very rough, jerking when I am going about 40-45 mph and 65-70mph.

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  • 2 more comments 
  • swilkerso677 Sep 25, 2009

    I have not checked the injectors or done a compression test... what will that do?

  • swilkerso677 Sep 29, 2009

    yes and it is still not working... have replaced the o2 sensor also

  • michael schultz
    michael schultz May 11, 2010

    have you checked the injectors? how about a compression test?

  • clarkfish1
    clarkfish1 Oct 17, 2013

    so what was the correction



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Well a compression test will tell you if the engines internal components are working properly and it is critical you start there when having a problem like this.

testing the injectors will let you know if they are giving fuel to the engine. there are two test for the injector and first one you do is an electrical test to see if they are getting turned on and off as they are supposed to and it they are internaly good electricaly with is done by listening to them with a stethoscope to see if you here the clicking sound the pintle valve makes inside of them. then there is the test to see if there spraying fuel or leaking fuel witch is called a leak down test and is done with a fuel pressure guage and a tester that will electrical turn the individual ijector on to see how much pressure it drops.

this is what i would do if i had it in my shop.

let me know if you have any more question and that you understood what i described.

Posted on Sep 29, 2009


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The Code(s) should be telling the specific cylinder(s) that are misfiring. Do you know waht the code is?
Target those cylinders 1st before testing the unaffected cylinders.
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1. Spark plugs - take out-reconnect back to wires and test spark plugs for getting sparks. If none: Don't replace them yet. GO TO 2. If the spark plugs are worn, dirty them replace them.
2. Remove spark plugs form end of ignition wires and test for spark from the wire. If none: Don't replace them yet. GO TO 3.
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