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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Re: 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.
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First you need to determine what type of miss you have. Is it random on all cylinders, or is it restricted to one or two cylinders? Random misfire can be caused by crank or cam sensors that are starting to give out. Single cylinder misfires can be due to plugs, wires, coils (you already addressed those), as well as internal issues such as burnt or broken valves.
Your codes indicate misfires. What was done in the "tune up"? Misfires can be caused by any of several different causes including (but not limited to):
spark plug wires
The term "tune up" used to mean, "replace points, condenser, distributor cap and rotor, and plugs". Since most cars no longer have points, condenser, distributor cap and rotor, we need to ask what was done...
hello,the fault code [generic-po306] is a cylinder 6 misfire,and can throw up manufacture specific p1135 and p1155. get a local garage to remove the number 6 plug from your lexus,and view the electrode end to see if it is 'oiled up'as you could have an internal engine problem,however it is rare to just have 1 cylinder with a specific problem,and will most commonly be the coil,you would be better off to replace all the 6 spark plug's and the 1 coil for that defective cylinder, hope that helps, regards.
Hello, this engine has 3 ignition coils on the passenger side cylinder head, each coil fires two spark plugs, the spark plugs on thew other side have plug wires connected to one of the coils on the other side, the #6 cylinder wire connects to the #3 coil, try replacing the spark plug wires
if a motor that miss fires that bad i would do a major tune up and all the fixings including spark plugs and plug wires if it had a distrubiter i would replace the cap and rotor and last but not least i would test the coil or coils if it dont have a distrubiter.
The minimum compression required is 95 psi, below this there is no good combustion, incusive the spark plug gets wet in gasoline
If this condition exists, you should check the piston rings and cylinder surface
It sounds like a misfire. Check spark plugs 5 and 6. It could be bad fuel, bad plug wire, or weak coil. Check the fuel injectors as well. Other possible causes could be an egr valve stuck open, vacuum leaks, low fuel pressure.
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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.
The following should isolate the problem(s).
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.
3. Remove the wires from the coil connection and test the coil for spark for each cylinder. If none: Don't replace it yet.
4. Test each spark plug and wires this way.
5. Coil Packs normally provide fire for 2-cylinders at the same time. The two are paired across from one another.
6. Test the coil for fire, amount of fire and if there is both cyclinders firing.
Misfire and the O2 Sensor got replaced??
Good Luck and get back with me if you need additional help or if this solved the problem.