My 1996 Lexus ES300 engine problem started about a year ago. First, check engine light came on and codes were P0302 & P306, plug wires were replaced and it was OK for a while but same codes appeared 2 months later and this time, igntion coil and #6 fuel injector was replaced. Car ran fine for 3 months and problem came back. Now it vibrates at idle. Any suggestions?

Dale Farr

• 78 Answers
• Posted on Mar 17, 2009

SOURCE: 96 lexus es 300 blinking check engine light

Hi there;

#4 Miss-fire. All the things you are saying make a lot of sense. When the light is blinking the cylinder is actualy misfiring, & the smell you are smelling is the fuel that is not burning in the engine burning in the exahst. This can cause a lot of damage to the exausht if it is not repaired..
There is still a couple of things that need to be checked, first he needs to check to see if it is possibly a fuel injector that is sticking. He can do this easily by moving the #4 injector to another cylinder & run the car. When it starts missfiring he will need to see if it is still #4 or if it is the cylinder that he moved the injector to. if it is the new cylinder it is obviously the injector, if it is still #4 he will need to look into the possibility of the EGR valve sticking open or some other issue to do with valve timing or low compression.
I hope this helps
Farrout!

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SOURCE: 2000 lexus es300 error code p0440, p0441, p0446

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michael schultz

• 1068 Answers
• Posted on Sep 29, 2009

SOURCE: ES300 Lexus cylinder misfiring

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.